I am trying to convert a FormatGrayscale8 image to FormatARGB32 (or any other 8bpp RGB format). I tried to use QImage::convertToFormat and a color table but I can't make it work. The input is a small 8bit gray image (PGM format text string). QImage img; img.loadFromData(graymap.toLatin1); QImage heatmap = img.convertToFormat(QImage::FormatIndexed8, colorgradient.getColorMap). SetPixel( 2, 1, value);In case of a 8-bit and monchrome images, the pixel value is. QImage::FormatARGB325The image is stored using a 32-bit ARGB format.

Detailed DescriptionQt provides four classes for handling image data:,. Is designed and optimized for I/O, and for direct pixel access and manipulation, while is designed and optimized for showing images on screen. Is only a convenience class that inherits, ensuring a depth of 1. Finally, the class is a paint device that records and replays commands.Because is a subclass, can be used to draw directly onto images. When using on a, the painting can be performed in another thread than the current GUI thread.The class supports several image formats described by the enum. These include monochrome, 8-bit, 32-bit and alpha-blended images which are available in all versions of Qt 4.x.provides a collection of functions that can be used to obtain a variety of information about the image. There are also several functions that enables transformation of the image.objects can be passed around by value since the class uses.

Resultingimage.convertToFormat(QImage::FormatIndexed8, colourtable, 0); auto pix = QPixmap::fromImage(resultingimage) I would realy appreciate some help in identifying the corresponding elements in Skia, or some reference to where I could look at to have some pointers. The solution. The fourth parameter of the QImage constructor, where we pass the image width ( im.shape1) a second time, is the bytesPerLine parameter. By default, QImage does not set the number of bytes per line (stride) equal to the image width. Omitting the bytesPerLine specification causes PySide to set up the QImage object in a way.

Objects can also be streamed and compared.Note: If you would like to load objects in a static build of Qt, refer to the.Warning: Painting on a with the format is not supported. Reading and Writing Image Filesprovides several ways of loading an image file: The file can be loaded when constructing the object, or by using the or functions later on. Also provides the static function, constructing a from the given data. When loading an image, the file name can either refer to an actual file on disk or to one of the application's embedded resources.

See overview for details on how to embed images and other resource files in the application's executable.Simply call the function to save a object.The complete list of supported file formats are available through the and functions. New file formats can be added as plugins. By default, Qt supports the following formats. FormatDescriptionQt's supportBMPWindows BitmapRead/writeGIFGraphic Interchange Format (optional)ReadJPGJoint Photographic Experts GroupRead/writeJPEGJoint Photographic Experts GroupRead/writePNGPortable Network GraphicsRead/writePBMPortable BitmapReadPGMPortable GraymapReadPPMPortable PixmapRead/writeXBMX11 BitmapRead/writeXPMX11 PixmapRead/writeImage Informationprovides a collection of functions that can be used to obtain a variety of information about the image. Available FunctionsGeometryThe , , , , and functions provide information about the image size and aspect ratio.The function returns the image's enclosing rectangle. The function tells if a given pair of coordinates is within this rectangle. The function returns the number of pixels by which the image is intended to be offset by when positioned relative to other images, which also can be manipulated using the function.ColorsThe color of a pixel can be retrieved by passing its coordinates to the function.

The function returns the color as a value indepedent of the image's format.In case of monochrome and 8-bit images, the and functions provide information about the color components used to store the image data: The function returns the image's entire color table. To obtain a single entry, use the function to retrieve the pixel index for a given pair of coordinates, then use the function to retrieve the color.

Note that if you create an 8-bit image manually, you have to set a valid color table on the image as well.The function tells if the image's format respects the alpha channel, or not. The and functions tell whether an image's colors are all shades of gray.See also the and sections.TextThe function returns the image text associated with the given text key. An image's text keys can be retrieved using the function. Use the function to alter an image's text.Low-level informationThe function returns the depth of the image. The supported depths are 1 (monochrome), 8, 16, 24 and 32 bits. The function tells how many of those bits that are used.

For more information see the section.The , , and functions provide low-level information about the data stored in the image.The function returns a number that uniquely identifies the contents of this object.Pixel ManipulationThe functions used to manipulate an image's pixels depend on the image format. The reason is that monochrome and 8-bit images are index-based and use a color lookup table, while 32-bit images store ARGB values directly. For more information on image formats, see the section.In case of a 32-bit image, the function can be used to alter the color of the pixel at the given coordinates to any other color specified as an ARGB quadruplet. To make a suitable value, use the (adding a default alpha component to the given RGB values, i.e. Creating an opaque color) or function.

32-bitimage( 3, 3,::FormatRGB32);value;value = ( 189, 149, 39); // 0xffbd9527image.setPixel( 1, 1, value);value = ( 122, 163, 39); // 0xff7aa327image.setPixel( 0, 1, value);image.setPixel( 1, 0, value);value = ( 237, 187, 51); // 0xffedba31image.setPixel( 2, 1, value);In case of a 8-bit and monchrome images, the pixel value is only an index from the image's color table. So the function can only be used to alter the color of the pixel at the given coordinates to a predefined color from the image's color table, i.e. It can only change the pixel's index value. To alter or add a color to an image's color table, use the function.An entry in the color table is an ARGB quadruplet encoded as an value. Use the and functions to make a suitable value for use with the function. 8-bitimage( 3, 3,::FormatIndexed8);value;value = ( 122, 163, 39); // 0xff7aa327image.setColor( 0, value);value = ( 237, 187, 51); // 0xffedba31image.setColor( 1, value);value = ( 189, 149, 39); // 0xffbd9527image.setColor( 2, value);image.setPixel( 0, 1, 0);image.setPixel( 1, 0, 0);image.setPixel( 1, 1, 2);image.setPixel( 2, 1, 1);For images with more than 8-bit per color-channel. The methods and can be used to set and get with values.also provide the function which returns a pointer to the pixel data at the scanline with the given index, and the function which returns a pointer to the first pixel data (this is equivalent to scanLine(0)).

Image FormatsEach pixel stored in a is represented by an integer. The size of the integer varies depending on the format. Supports several image formats described by the enum.Monochrome images are stored using 1-bit indexes into a color table with at most two colors. There are two different types of monochrome images: big endian (MSB first) or little endian (LSB first) bit order.8-bit images are stored using 8-bit indexes into a color table, i.e. They have a single byte per pixel. The color table is a, and the typedef is equivalent to an unsigned int containing an ARGB quadruplet on the format 0xAARRGGBB.32-bit images have no color table; instead, each pixel contains an value. There are three different types of 32-bit images storing RGB (i.e.

0xffRRGGBB), ARGB and premultiplied ARGB values respectively. In the premultiplied format the red, green, and blue channels are multiplied by the alpha component divided by 255.An image's format can be retrieved using the function. Use the functions to convert an image into another format.

The and functions tell whether a color image can safely be converted to a grayscale image. Image Transformationssupports a number of functions for creating a new image that is a transformed version of the original: The function builds and returns a 1-bpp mask from the alpha buffer in this image, and the function creates and returns a 1-bpp heuristic mask for this image. FunctionDescriptionDefines the aspect ratio by setting the number of pixels that fit horizontally in a physical meter.Defines the aspect ratio by setting the number of pixels that fit vertically in a physical meter.Fills the entire image with the given pixel value.Inverts all pixel values in the image using the given value.Sets the color table used to translate color indexes. Only monochrome and 8-bit formats.Resizes the color table. Only monochrome and 8-bit formats.See also,. ConstantValueDescriptionQImage::FormatInvalid0The image is invalid.QImage::FormatMono1The image is stored using 1-bit per pixel.

Bytes are packed with the most significant bit (MSB) first.QImage::FormatMonoLSB2The image is stored using 1-bit per pixel. Bytes are packed with the less significant bit (LSB) first.QImage::FormatIndexed83The image is stored using 8-bit indexes into a colormap.QImage::FormatRGB324The image is stored using a 32-bit RGB format (0xffRRGGBB).QImage::FormatARGB325The image is stored using a 32-bit ARGB format (0xAARRGGBB).QImage::FormatARGB32Premultiplied6The image is stored using a premultiplied 32-bit ARGB format (0xAARRGGBB), i.e.

The red, green, and blue channels are multiplied by the alpha component divided by 255. (If RR, GG, or BB has a higher value than the alpha channel, the results are undefined.) Certain operations (such as image composition using alpha blending) are faster using premultiplied ARGB32 than with plain ARGB32.QImage::FormatRGB167The image is stored using a 16-bit RGB format (5-6-5).QImage::FormatARGB8565Premultiplied8The image is stored using a premultiplied 24-bit ARGB format (8-5-6-5).QImage::FormatRGB6669The image is stored using a 24-bit RGB format (6-6-6). The unused most significant bits is always zero.QImage::FormatARGB6666Premultiplied10The image is stored using a premultiplied 24-bit ARGB format (6-6-6-6).QImage::FormatRGB55511The image is stored using a 16-bit RGB format (5-5-5). The unused most significant bit is always zero.QImage::FormatARGB8555Premultiplied12The image is stored using a premultiplied 24-bit ARGB format (8-5-5-5).QImage::FormatRGB88813The image is stored using a 24-bit RGB format (8-8-8).QImage::FormatRGB44414The image is stored using a 16-bit RGB format (4-4-4). The unused bits are always zero.QImage::FormatARGB4444Premultiplied15The image is stored using a premultiplied 16-bit ARGB format (4-4-4-4).QImage::FormatRGBX888816The image is stored using a 32-bit byte-ordered RGB(x) format (8-8-8-8). This is the same as the FormatRGBA8888 except alpha must always be 255.

(added in Qt 5.2)QImage::FormatRGBA888817The image is stored using a 32-bit byte-ordered RGBA format (8-8-8-8). Unlike ARGB32 this is a byte-ordered format, which means the 32bit encoding differs between big endian and little endian architectures, being respectively (0xRRGGBBAA) and (0xAABBGGRR). The order of the colors is the same on any architecture if read as bytes 0xRR,0xGG,0xBB,0xAA. (added in Qt 5.2)QImage::FormatRGBA8888Premultiplied18The image is stored using a premultiplied 32-bit byte-ordered RGBA format (8-8-8-8).

(added in Qt 5.2)QImage::FormatBGR3019The image is stored using a 32-bit BGR format (x-10-10-10). (added in Qt 5.4)QImage::FormatA2BGR30Premultiplied20The image is stored using a 32-bit premultiplied ABGR format (2-10-10-10). (added in Qt 5.4)QImage::FormatRGB3021The image is stored using a 32-bit RGB format (x-10-10-10).

(added in Qt 5.4)QImage::FormatA2RGB30Premultiplied22The image is stored using a 32-bit premultiplied ARGB format (2-10-10-10). (added in Qt 5.4)QImage::FormatAlpha823The image is stored using an 8-bit alpha only format.

(added in Qt 5.5)QImage::FormatGrayscale824The image is stored using an 8-bit grayscale format. (added in Qt 5.5)QImage::FormatGrayscale1628The image is stored using an 16-bit grayscale format.

(added in Qt 5.13)QImage::FormatRGBX6425The image is stored using a 64-bit halfword-ordered RGB(x) format (16-16-16-16). This is the same as the FormatRGBX64 except alpha must always be 65535. (added in Qt 5.12)QImage::FormatRGBA6426The image is stored using a 64-bit halfword-ordered RGBA format (16-16-16-16). (added in Qt 5.12)QImage::FormatRGBA64Premultiplied27The image is stored using a premultiplied 64-bit halfword-ordered RGBA format (16-16-16-16). (added in Qt 5.12)Note: Drawing into a with QImage::FormatIndexed8 is not supported.Note: Avoid most rendering directly to most of these formats using. Rendering is best optimized to the FormatRGB32 and FormatARGB32Premultiplied formats, and secondarily for rendering to the FormatRGB16, FormatRGBX8888, FormatRGBA8888Premultiplied, FormatRGBX64 and FormatRGBA64Premultiplied formatsSee also and. Enum QImage:: InvertModeThis enum type is used to describe how pixel values should be inverted in the function.

Static const char. const startxpm = '16 15 8 1', 'a c #cec6bd',.The extra const makes the entire definition read-only, which is slightly more efficient (e.g., when the code is in a shared library) and able to be stored in ROM with the application. QImage:: QImage(const.

data, int width, int height, int bytesPerLine, format, cleanupFunction = nullptr, void. cleanupInfo = nullptr)Constructs an image with the given width, height and format, that uses an existing memory buffer, data.

The width and height must be specified in pixels. BytesPerLine specifies the number of bytes per line (stride).The buffer must remain valid throughout the life of the and all copies that have not been modified or otherwise detached from the original buffer. The image does not delete the buffer at destruction.

You can provide a function pointer cleanupFunction along with an extra pointer cleanupInfo that will be called when the last copy is destroyed.If format is an indexed color format, the image color table is initially empty and must be sufficiently expanded with or before the image is used.Unlike the similar constructor that takes a non-const data buffer, this version will never alter the contents of the buffer. For example, calling will return a deep copy of the image, rather than the buffer passed to the constructor. This allows for the efficiency of constructing a from raw data, without the possibility of the raw data being changed. QImage:: QImage(. data, int width, int height, int bytesPerLine, format, cleanupFunction = nullptr, void. cleanupInfo = nullptr)Constructs an image with the given width, height and format, that uses an existing memory buffer, data. The width and height must be specified in pixels.

BytesPerLine specifies the number of bytes per line (stride).The buffer must remain valid throughout the life of the and all copies that have not been modified or otherwise detached from the original buffer. The image does not delete the buffer at destruction. You can provide a function pointer cleanupFunction along with an extra pointer cleanupInfo that will be called when the last copy is destroyed.If format is an indexed color format, the image color table is initially empty and must be sufficiently expanded with or before the image is used. QImage:: QImage(const. data, int width, int height, format, cleanupFunction = nullptr, void. cleanupInfo = nullptr)Constructs an image with the given width, height and format, that uses an existing read-only memory buffer, data. The width and height must be specified in pixels, data must be 32-bit aligned, and each scanline of data in the image must also be 32-bit aligned.The buffer must remain valid throughout the life of the and all copies that have not been modified or otherwise detached from the original buffer.

The image does not delete the buffer at destruction. You can provide a function pointer cleanupFunction along with an extra pointer cleanupInfo that will be called when the last copy is destroyed.If format is an indexed color format, the image color table is initially empty and must be sufficiently expanded with or before the image is used.Unlike the similar constructor that takes a non-const data buffer, this version will never alter the contents of the buffer. For example, calling will return a deep copy of the image, rather than the buffer passed to the constructor. This allows for the efficiency of constructing a from raw data, without the possibility of the raw data being changed. QImage:: QImage(. data, int width, int height, format, cleanupFunction = nullptr, void. cleanupInfo = nullptr)Constructs an image with the given width, height and format, that uses an existing memory buffer, data.

The width and height must be specified in pixels, data must be 32-bit aligned, and each scanline of data in the image must also be 32-bit aligned.The buffer must remain valid throughout the life of the and all copies that have not been modified or otherwise detached from the original buffer. The image does not delete the buffer at destruction. You can provide a function pointer cleanupFunction along with an extra pointer cleanupInfo that will be called when the last copy is destroyed.If format is an indexed color format, the image color table is initially empty and must be sufficiently expanded with or before the image is used. QImage:: QImage( int width, int height, format)Constructs an image with the given width, height and format.A image will be returned if memory cannot be allocated.Warning: This will create a with uninitialized data.

Call to fill the image with an appropriate pixel value before drawing onto it with. QImage:: QImage(const & size, format)Constructs an image with the given size and format.A image is returned if memory cannot be allocated.Warning: This will create a with uninitialized data. Call to fill the image with an appropriate pixel value before drawing onto it with.

QImage:: QImageConstructs a null image.See also. &QImage:: operator=( && other)Move-assigns other to this instance.This function was introduced in Qt 5.2. &QImage:: operator=(const & image)Assigns a shallow copy of the given image to this image and returns a reference to this image.For more information about shallow copies, see the documentation.See also and. virtual QImage:: QImageDestroys the image and cleans up. Bool QImage:: allGray constReturns true if all the colors in the image are shades of gray (i.e. Their red, green and blue components are equal); otherwise false.Note that this function is slow for images without color table.See also.

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Int QImage:: bitPlaneCount constReturns the number of bit planes in the image.The number of bit planes is the number of bits of color and transparency information for each pixel. This is different from (i.e. Smaller than) the depth when the image format contains unused bits.This function was introduced in Qt 4.7.See also , ,.QImage:: bitsReturns a pointer to the first pixel data.

This is equivalent to (0).Note that uses. This function performs a deep copy of the shared pixel data, thus ensuring that this is the only one using the current return value.See also , , and. Const.QImage:: bits constThis is an overloaded function.Note that uses, but this function does not perform a deep copy of the shared pixel data, because the returned data is const. Int QImage:: bytesPerLine constReturns the number of bytes per image scanline.This is equivalent to / if is non-zero.See also.

QImage:: cacheKey constReturns a number that identifies the contents of this object. Distinct objects can only have the same key if they refer to the same contents.The key will change when the image is altered. QImage:: color( int i) constReturns the color in the color table at index i. The first color is at index 0.The colors in an image's color table are specified as ARGB quadruplets. Use the , , , and functions to get the color value components.See also , ,. Int QImage:: colorCount constReturns the size of the color table for the image.Notice that colorCount returns 0 for 32-bpp images because these images do not use color tables, but instead encode pixel values as ARGB quadruplets.This function was introduced in Qt 4.6.See also. QImage:: colorTable constReturns a list of the colors contained in the image's color table, or an empty list if the image does not have a color tableSee also , , and.

Const.QImage:: constBits constReturns a pointer to the first pixel data.Note that uses, but this function does not perform a deep copy of the shared pixel data, because the returned data is const.This function was introduced in Qt 4.7.See also and. Const.QImage:: constScanLine( int i) constReturns a pointer to the pixel data at the scanline with index i.

The first scanline is at index 0.The scanline data is aligned on a 32-bit boundary.Note that uses, but this function does not perform a deep copy of the shared pixel data, because the returned data is const.This function was introduced in Qt 4.7.See also and. Void QImage:: convertTo( format, flags = Qt::AutoColor)Detach and convert the image to the given format in place.The specified image conversion flags control how the image data is handled during the conversion process.This function was introduced in Qt 5.13.See also. QImage:: convertToFormat( format, const & colorTable, flags = Qt::AutoColor) constThis is an overloaded function.Returns a copy of the image converted to the given format, using the specified colorTable.Conversion from RGB formats to indexed formats is a slow operation and will use a straightforward nearest color approach, with no dithering. QImage:: copy(const & rectangle = QRect) constReturns a sub-area of the image as a new image.The returned image is copied from the position ( rectangle.x, rectangle.y) in this image, and will always have the size of the given rectangle.In areas beyond this image, pixels are set to 0. For 32-bit RGB images, this means black; for 32-bit ARGB images, this means transparent black; for 8-bit images, this means the color with index 0 in the color table which can be anything; for 1-bit images, this means.If the given rectangle is a null rectangle the entire image is copied.See also. QImage:: copy( int x, int y, int width, int height) constThis is an overloaded function.The returned image is copied from the position ( x, y) in this image, and will always have the given width and height.

In areas beyond this image, pixels are set to 0. QImage:: createAlphaMask( flags = Qt::AutoColor) constBuilds and returns a 1-bpp mask from the alpha buffer in this image. Returns a null image if the image's format is.The flags argument is a bitwise-OR of the, and controls the conversion process. Passing 0 for flags sets all the default options.The returned image has little-endian bit order (i.e. The image's format is ), which you can convert to big-endian using the function.See also.

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QImage:: createHeuristicMask( bool clipTight = true) constCreates and returns a 1-bpp heuristic mask for this image.The function works by selecting a color from one of the corners, then chipping away pixels of that color starting at all the edges. The four corners vote for which color is to be masked away. In case of a draw (this generally means that this function is not applicable to the image), the result is arbitrary.The returned image has little-endian bit order (i.e. The image's format is ), which you can convert to big-endian using the function.If clipTight is true (the default) the mask is just large enough to cover the pixels; otherwise, the mask is larger than the data pixels.Note that this function disregards the alpha buffer.See also. QImage:: createMaskFromColor( color, mode = Qt::MaskInColor) constCreates and returns a mask for this image based on the given color value. If the mode is MaskInColor (the default value), all pixels matching color will be opaque pixels in the mask.

If mode is MaskOutColor, all pixels matching the given color will be transparent.See also and. Int QImage:: depth constReturns the depth of the image.The image depth is the number of bits used to store a single pixel, also called bits per pixel (bpp).The supported depths are 1, 8, 16, 24, 32 and 64.See also , ,. QImage:: devicePixelRatio constReturns the device pixel ratio for the image. This is the ratio between device pixels and device independent pixels.Use this function when calculating layout geometry based on the image size: layoutSize = image. / image.devicePixelRatioThe default value is 1.0.See also. Int QImage:: dotsPerMeterX constReturns the number of pixels that fit horizontally in a physical meter.

Together with , this number defines the intended scale and aspect ratio of the image.See also. Int QImage:: dotsPerMeterY constReturns the number of pixels that fit vertically in a physical meter. Together with , this number defines the intended scale and aspect ratio of the image.See also.

Void QImage:: fill( pixelValue)Fills the entire image with the given pixelValue.If the depth of this image is 1, only the lowest bit is used. If you say fill(0), fill(2), etc., the image is filled with 0s. If you say fill(1), fill(3), etc., the image is filled with 1s.

If the depth is 8, the lowest 8 bits are used and if the depth is 16 the lowest 16 bits are used.Note: returns the color of the pixel at the given coordinates while QColor::pixel returns the pixel value of the underlying window system (essentially an index value), so normally you will want to use to use a color from an existing image or to use a specific color.See also. Void QImage:: fill(const & color)This is an overloaded function.Fills the entire image with the given color.If the depth of the image is 1, the image will be filled with 1 if color equals; it will otherwise be filled with 0.If the depth of the image is 8, the image will be filled with the index corresponding the color in the color table if present; it will otherwise be filled with 0.This function was introduced in Qt 4.8.

Void QImage:: fill( color)This is an overloaded function.Fills the image with the given color, described as a standard global color.This function was introduced in Qt 4.8. QImage:: format constReturns the format of the image.See also. static QImage:: fromData(const. data, int size, const char.

format = nullptr)Constructs a from the first size bytes of the given binary data. The loader attempts to read the image using the specified format. If format is not specified (which is the default), the loader probes the data for a header to guess the file format.If format is specified, it must be one of the values returned by.If the loading of the image fails, the image returned will be a null image.See also , ,. static QImage:: fromData(const & data, const char. format = nullptr)This is an overloaded function.Loads an image from the given data. Bool QImage:: hasAlphaChannel constReturns true if the image has a format that respects the alpha channel, otherwise returns false.See also. Int QImage:: height constReturns the height of the image.See also.

Void QImage:: invertPixels( mode = InvertRgb)Inverts all pixel values in the image.The given invert mode only have a meaning when the image's depth is 32. The default mode is, which leaves the alpha channel unchanged. If the mode is, the alpha bits are also inverted.Inverting an 8-bit image means to replace all pixels using color index i with a pixel using color index 255 minus i. The same is the case for a 1-bit image. Note that the color table is not changed.If the image has a premultiplied alpha channel, the image is first converted to an unpremultiplied image format to be inverted and then converted back.See also. Bool QImage:: isGrayscale constFor 32-bit images, this function is equivalent to.For color indexed images, this function returns true if color(i) is (i, i, i) for all indexes of the color table; otherwise returns false.See also.

Bool QImage:: isNull constReturns true if it is a null image, otherwise returns false.A null image has all parameters set to zero and no allocated data. Bool QImage:: load(const & fileName, const char.

format = nullptr)Loads an image from the file with the given fileName. Returns true if the image was successfully loaded; otherwise invalidates the image and returns false.The loader attempts to read the image using the specified format, e.g., PNG or JPG. If format is not specified (which is the default), it is auto-detected based on the file's suffix and header. For details, see.The file name can either refer to an actual file on disk or to one of the application's embedded resources. See the overview for details on how to embed images and other resource files in the application's executable.See also. Bool QImage:: load(.

device, const char. format)This is an overloaded function.This function reads a from the given device. This can, for example, be used to load an image directly into a. Bool QImage:: loadFromData(const. data, int len, const char. format = nullptr)Loads an image from the first len bytes of the given binary data. Returns true if the image was successfully loaded; otherwise invalidates the image and returns false.The loader attempts to read the image using the specified format, e.g., PNG or JPG.

If format is not specified (which is the default), the loader probes the file for a header to guess the file format.See also. Bool QImage:: loadFromData(const & data, const char.

format = nullptr)This is an overloaded function.Loads an image from the given data. QImage:: offset constReturns the number of pixels by which the image is intended to be offset by when positioning relative to other images.See also.

QImage:: pixel(const & position) constReturns the color of the pixel at the given position.If the position is not valid, the results are undefined.Warning: This function is expensive when used for massive pixel manipulations. Use or when many pixels needs to be read.See also , , , ,.

QImage:: pixel( int x, int y) constThis is an overloaded function.Returns the color of the pixel at coordinates ( x, y). QImage:: pixelColor(const & position) constReturns the color of the pixel at the given position as a.If the position is not valid, an invalid is returned.Warning: This function is expensive when used for massive pixel manipulations. Use or when many pixels needs to be read.This function was introduced in Qt 5.6.See also , , , , ,. QImage:: pixelColor( int x, int y) constThis is an overloaded function.Returns the color of the pixel at coordinates ( x, y) as a.This function was introduced in Qt 5.6. QImage:: pixelFormat constReturns the as a int QImage:: pixelIndex(const & position) constReturns the pixel index at the given position.If position is not valid, or if the image is not a paletted image ( 8), the results are undefined.See also , ,. Int QImage:: pixelIndex( int x, int y) constThis is an overloaded function.Returns the pixel index at ( x, y). QImage:: rect constReturns the enclosing rectangle (0, 0, , ) of the image.See also.

Bool QImage:: reinterpretAsFormat( format)Changes the format of the image to format without changing the data. Only works between formats of the same depth.Returns true if successful.This function can be used to change images with alpha-channels to their corresponding opaque formats if the data is known to be opaque-only, or to change the format of a given image buffer before overwriting it with new data.Warning: The function does not check if the image data is valid in the new format and will still return true if the depths are compatible. Operations on an image with invalid data are undefined.Warning: If the image is not detached, this will cause the data to be copied.This function was introduced in Qt 5.9.See also and. Bool QImage:: save(const & fileName, const char. format = nullptr, int quality = -1) constSaves the image to the file with the given fileName, using the given image file format and quality factor. If format is 0, will attempt to guess the format by looking at fileName's suffix.The quality factor must be in the range 0 to 100 or -1.

Specify 0 to obtain small compressed files, 100 for large uncompressed files, and -1 (the default) to use the default settings.Returns true if the image was successfully saved; otherwise returns false.See also. Bool QImage:: save(. device, const char.

format = nullptr, int quality = -1) constThis is an overloaded function.This function writes a to the given device.This can, for example, be used to save an image directly into a. Writer;writer.setFormat( 'png');if (writer.supportsOption(::Description)). Void myImageCleanupHandler( void.info);This typedef was introduced in Qt 5.0. &QImage:: operator( & stream, & image)Reads an image from the given stream and stores it in the given image.See also and.© 2019 The Qt Company Ltd.Documentation contributions included herein are the copyrights oftheir respective owners. The documentation provided herein is licensed under the terms of the as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. In Finland and/or other countries worldwide.

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