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## MagickAverageImages

MagickAverageImages() average a set of images.

The format of the MagickAverageImages method is:

      MagickWand *MagickAverageImages(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## ClonePixelView

ClonePixelView() makes a copy of the specified pixel view.

The format of the ClonePixelView method is:

      PixelView *ClonePixelView(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## DestroyPixelView

DestroyPixelView() deallocates memory associated with a pixel view.

The format of the DestroyPixelView method is:

      PixelView *DestroyPixelView(PixelView *pixel_view,
        const size_t number_wands,const size_t number_threads)

A description of each parameter follows:

##### pixel_view

the pixel view.

##### number_wand

the number of pixel wands.

##### number_threads

number of threads.

## DuplexTransferPixelViewIterator

DuplexTransferPixelViewIterator() iterates over three pixel views in parallel and calls your transfer method for each scanline of the view. The source and duplex pixel region is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. However, the destination pixel view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.

Use this pragma:

          #pragma omp critical

to define a section of code in your callback transfer method that must be executed by a single thread at a time.

The format of the DuplexTransferPixelViewIterator method is:

      MagickBooleanType DuplexTransferPixelViewIterator(PixelView *source,
        PixelView *duplex,PixelView *destination,
        DuplexTransferPixelViewMethod transfer,void *context)

A description of each parameter follows:

##### source

the source pixel view.

##### duplex

the duplex pixel view.

##### destination

the destination pixel view.

##### transfer

the transfer callback method.

##### context

the user defined context.

## GetPixelViewException

GetPixelViewException() returns the severity, reason, and description of any error that occurs when utilizing a pixel view.

The format of the GetPixelViewException method is:

      char *GetPixelViewException(const PixelWand *pixel_view,
        ExceptionType *severity)

A description of each parameter follows:

##### pixel_view

the pixel pixel_view.

##### severity

the severity of the error is returned here.

## GetPixelViewHeight

GetPixelViewHeight() returns the pixel view height.

The format of the GetPixelViewHeight method is:

      size_t GetPixelViewHeight(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## GetPixelViewIterator

GetPixelViewIterator() iterates over the pixel view in parallel and calls your get method for each scanline of the view. The pixel region is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. Any updates to the pixels in your callback are ignored.

Use this pragma:

          #pragma omp critical

to define a section of code in your callback get method that must be executed by a single thread at a time.

The format of the GetPixelViewIterator method is:

      MagickBooleanType GetPixelViewIterator(PixelView *source,
        GetPixelViewMethod get,void *context)

A description of each parameter follows:

##### source

the source pixel view.

##### get

the get callback method.

##### context

the user defined context.

## GetPixelViewPixels

GetPixelViewPixels() returns the pixel view pixel_wands.

The format of the GetPixelViewPixels method is:

      PixelWand *GetPixelViewPixels(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## GetPixelViewWand

GetPixelViewWand() returns the magick wand associated with the pixel view.

The format of the GetPixelViewWand method is:

      MagickWand *GetPixelViewWand(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## GetPixelViewWidth

GetPixelViewWidth() returns the pixel view width.

The format of the GetPixelViewWidth method is:

      size_t GetPixelViewWidth(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## GetPixelViewX

GetPixelViewX() returns the pixel view x offset.

The format of the GetPixelViewX method is:

      ssize_t GetPixelViewX(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## GetPixelViewY

GetPixelViewY() returns the pixel view y offset.

The format of the GetPixelViewY method is:

      ssize_t GetPixelViewY(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## IsPixelView

IsPixelView() returns MagickTrue if the the parameter is verified as a pixel view container.

The format of the IsPixelView method is:

      MagickBooleanType IsPixelView(const PixelView *pixel_view)

A description of each parameter follows:

##### pixel_view

the pixel view.

## MagickClipPathImage

MagickClipPathImage() clips along the named paths from the 8BIM profile, if present. Later operations take effect inside the path. Id may be a number if preceded with #, to work on a numbered path, e.g., "#1" to use the first path.

The format of the MagickClipPathImage method is:

      MagickBooleanType MagickClipPathImage(MagickWand *wand,
        const char *pathname,const MagickBooleanType inside)

A description of each parameter follows:

##### wand

the magick wand.

##### pathname

name of clipping path resource. If name is preceded by #, use clipping path numbered by name.

##### inside

if non-zero, later operations take effect inside clipping path. Otherwise later operations take effect outside clipping path.

## DrawGetFillAlpha

DrawGetFillAlpha() returns the alpha used when drawing using the fill color or fill texture. Fully opaque is 1.0.

The format of the DrawGetFillAlpha method is:

      double DrawGetFillAlpha(const DrawingWand *wand)

A description of each parameter follows:

##### wand

the drawing wand.

## DrawGetStrokeAlpha

DrawGetStrokeAlpha() returns the alpha of stroked object outlines.

The format of the DrawGetStrokeAlpha method is:

      double DrawGetStrokeAlpha(const DrawingWand *wand)

A description of each parameter follows:

##### wand

the drawing wand.

## DrawPeekGraphicWand

DrawPeekGraphicWand() returns the current drawing wand.

The format of the PeekDrawingWand method is:

      DrawInfo *DrawPeekGraphicWand(const DrawingWand *wand)

A description of each parameter follows:

##### wand

the drawing wand.

## DrawPopGraphicContext

DrawPopGraphicContext() destroys the current drawing wand and returns to the previously pushed drawing wand. Multiple drawing wands may exist. It is an error to attempt to pop more drawing wands than have been pushed, and it is proper form to pop all drawing wands which have been pushed.

The format of the DrawPopGraphicContext method is:

      MagickBooleanType DrawPopGraphicContext(DrawingWand *wand)

A description of each parameter follows:

##### wand

the drawing wand.

## DrawPushGraphicContext

DrawPushGraphicContext() clones the current drawing wand to create a new drawing wand. The original drawing wand(s) may be returned to by invoking PopDrawingWand(). The drawing wands are stored on a drawing wand stack. For every Pop there must have already been an equivalent Push.

The format of the DrawPushGraphicContext method is:

      MagickBooleanType DrawPushGraphicContext(DrawingWand *wand)

A description of each parameter follows:

##### wand

the drawing wand.

## DrawSetFillAlpha

DrawSetFillAlpha() sets the alpha to use when drawing using the fill color or fill texture. Fully opaque is 1.0.

The format of the DrawSetFillAlpha method is:

      void DrawSetFillAlpha(DrawingWand *wand,const double fill_alpha)

A description of each parameter follows:

##### wand

the drawing wand.

##### fill_alpha

fill alpha

## DrawSetStrokeAlpha

DrawSetStrokeAlpha() specifies the alpha of stroked object outlines.

The format of the DrawSetStrokeAlpha method is:

      void DrawSetStrokeAlpha(DrawingWand *wand,const double stroke_alpha)

A description of each parameter follows:

##### wand

the drawing wand.

##### stroke_alpha

stroke alpha. The value 1.0 is opaque.

## MagickColorFloodfillImage

MagickColorFloodfillImage() changes the color value of any pixel that matches target and is an immediate neighbor. If the method FillToBorderMethod is specified, the color value is changed for any neighbor pixel that does not match the bordercolor member of image.

The format of the MagickColorFloodfillImage method is:

      MagickBooleanType MagickColorFloodfillImage(MagickWand *wand,
        const PixelWand *fill,const double fuzz,const PixelWand *bordercolor,
        const ssize_t x,const ssize_t y)

A description of each parameter follows:

##### wand

the magick wand.

##### fill

the floodfill color pixel wand.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

##### bordercolor

the border color pixel wand.

##### x,y

the starting location of the operation.

## MagickDescribeImage

MagickDescribeImage() identifies an image by printing its attributes to the file. Attributes include the image width, height, size, and others.

The format of the MagickDescribeImage method is:

      const char *MagickDescribeImage(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickFlattenImages

MagickFlattenImages() merges a sequence of images. This useful for combining Photoshop layers into a single image.

The format of the MagickFlattenImages method is:

      MagickWand *MagickFlattenImages(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickGetImageAttribute

MagickGetImageAttribute() returns a value associated with the specified property. Use MagickRelinquishMemory() to free the value when you are finished with it.

The format of the MagickGetImageAttribute method is:

      char *MagickGetImageAttribute(MagickWand *wand,const char *property)

A description of each parameter follows:

##### wand

the magick wand.

##### property

the property.

## MagickGetImageMatte

MagickGetImageMatte() returns MagickTrue if the image has a matte channel otherwise MagickFalse.

The format of the MagickGetImageMatte method is:

      size_t MagickGetImageMatte(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickGetImagePixels

MagickGetImagePixels() extracts pixel data from an image and returns it to you. The method returns MagickTrue on success otherwise MagickFalse if an error is encountered. The data is returned as char, short int, int, ssize_t, float, or double in the order specified by map.

Suppose you want to extract the first scanline of a 640x480 image as character data in red-green-blue order:

      MagickGetImagePixels(wand,0,0,640,1,"RGB",CharPixel,pixels);

The format of the MagickGetImagePixels method is:

      MagickBooleanType MagickGetImagePixels(MagickWand *wand,
        const ssize_t x,const ssize_t y,const size_t columns,
        const size_t rows,const char *map,const StorageType storage,
        void *pixels)

A description of each parameter follows:

##### wand

the magick wand.

##### x, y, columns, rows

These values define the perimeter of a region of pixels you want to extract.

##### map

This string reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha (0 is transparent), O = opacity (0 is opaque), C = cyan, Y = yellow, M = magenta, K = black, I = intensity (for grayscale), P = pad.

##### storage

Define the data type of the pixels. Float and double types are expected to be normalized [0..1] otherwise [0..QuantumRange]. Choose from these types: CharPixel, DoublePixel, FloatPixel, IntegerPixel, LongPixel, QuantumPixel, or ShortPixel.

##### pixels

This array of values contain the pixel components as defined by map and type. You must preallocate this array where the expected length varies depending on the values of width, height, map, and type.

## MagickGetImageSize

MagickGetImageSize() returns the image length in bytes.

The format of the MagickGetImageSize method is:

      MagickBooleanType MagickGetImageSize(MagickWand *wand,
        MagickSizeType *length)

A description of each parameter follows:

##### wand

the magick wand.

##### length

the image length in bytes.

## MagickMapImage

MagickMapImage() replaces the colors of an image with the closest color from a reference image.

The format of the MagickMapImage method is:

      MagickBooleanType MagickMapImage(MagickWand *wand,
        const MagickWand *map_wand,const MagickBooleanType dither)

A description of each parameter follows:

##### wand

the magick wand.

##### map

the map wand.

##### dither

Set this integer value to something other than zero to dither the mapped image.

## MagickMatteFloodfillImage

MagickMatteFloodfillImage() changes the transparency value of any pixel that matches target and is an immediate neighbor. If the method FillToBorderMethod is specified, the transparency value is changed for any neighbor pixel that does not match the bordercolor member of image.

The format of the MagickMatteFloodfillImage method is:

      MagickBooleanType MagickMatteFloodfillImage(MagickWand *wand,
        const double alpha,const double fuzz,const PixelWand *bordercolor,
        const ssize_t x,const ssize_t y)

A description of each parameter follows:

##### wand

the magick wand.

##### alpha

the level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

##### bordercolor

the border color pixel wand.

##### x,y

the starting location of the operation.

## MagickMaximumImages

MagickMaximumImages() returns the maximum intensity of an image sequence.

The format of the MagickMaximumImages method is:

      MagickWand *MagickMaximumImages(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickMinimumImages

MagickMinimumImages() returns the minimum intensity of an image sequence.

The format of the MagickMinimumImages method is:

      MagickWand *MagickMinimumImages(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickMosaicImages

MagickMosaicImages() inlays an image sequence to form a single coherent picture. It returns a wand with each image in the sequence composited at the location defined by the page offset of the image.

The format of the MagickMosaicImages method is:

      MagickWand *MagickMosaicImages(MagickWand *wand)

A description of each parameter follows:

##### wand

the magick wand.

## MagickOpaqueImage

MagickOpaqueImage() changes any pixel that matches color with the color defined by fill.

The format of the MagickOpaqueImage method is:

      MagickBooleanType MagickOpaqueImage(MagickWand *wand,
        const PixelWand *target,const PixelWand *fill,const double fuzz)

A description of each parameter follows:

##### wand

the magick wand.

##### channel

the channel(s).

##### target

Change this target color to the fill color within the image.

##### fill

the fill pixel wand.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

## MagickPaintFloodfillImage

MagickPaintFloodfillImage() changes the color value of any pixel that matches target and is an immediate neighbor. If the method FillToBorderMethod is specified, the color value is changed for any neighbor pixel that does not match the bordercolor member of image.

The format of the MagickPaintFloodfillImage method is:

      MagickBooleanType MagickPaintFloodfillImage(MagickWand *wand,
        const ChannelType channel,const PixelWand *fill,const double fuzz,
        const PixelWand *bordercolor,const ssize_t x,const ssize_t y)

A description of each parameter follows:

##### wand

the magick wand.

##### channel

the channel(s).

##### fill

the floodfill color pixel wand.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

##### bordercolor

the border color pixel wand.

##### x,y

the starting location of the operation.

## MagickPaintOpaqueImage

MagickPaintOpaqueImage() changes any pixel that matches color with the color defined by fill.

The format of the MagickPaintOpaqueImage method is:

      MagickBooleanType MagickPaintOpaqueImage(MagickWand *wand,
        const PixelWand *target,const PixelWand *fill,const double fuzz)
      MagickBooleanType MagickPaintOpaqueImageChannel(MagickWand *wand,
        const ChannelType channel,const PixelWand *target,
        const PixelWand *fill,const double fuzz)

A description of each parameter follows:

##### wand

the magick wand.

##### channel

the channel(s).

##### target

Change this target color to the fill color within the image.

##### fill

the fill pixel wand.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

## MagickPaintTransparentImage

MagickPaintTransparentImage() changes any pixel that matches color with the color defined by fill.

The format of the MagickPaintTransparentImage method is:

      MagickBooleanType MagickPaintTransparentImage(MagickWand *wand,
        const PixelWand *target,const double alpha,const double fuzz)

A description of each parameter follows:

##### wand

the magick wand.

##### target

Change this target color to specified opacity value within the image.

##### alpha

the level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

## MagickRecolorImage

MagickRecolorImage() apply color transformation to an image. The method permits saturation changes, hue rotation, luminance to alpha, and various other effects. Although variable-sized transformation matrices can be used, typically one uses a 5x5 matrix for an RGBA image and a 6x6 for CMYKA (or RGBA with offsets). The matrix is similar to those used by Adobe Flash except offsets are in column 6 rather than 5 (in support of CMYKA images) and offsets are normalized (divide Flash offset by 255).

The format of the MagickRecolorImage method is:

      MagickBooleanType MagickRecolorImage(MagickWand *wand,
        const size_t order,const double *color_matrix)

A description of each parameter follows:

##### wand

the magick wand.

##### order

the number of columns and rows in the color matrix.

##### color_matrix

An array of doubles representing the color matrix.

## MagickSetImageAttribute

MagickSetImageAttribute() associates a property with an image.

The format of the MagickSetImageAttribute method is:

      MagickBooleanType MagickSetImageAttribute(MagickWand *wand,
        const char *property,const char *value)

A description of each parameter follows:

##### wand

the magick wand.

##### property

the property.

##### value

the value.

## MagickSetImageIndex

MagickSetImageIndex() set the current image to the position of the list specified with the index parameter.

The format of the MagickSetImageIndex method is:

      MagickBooleanType MagickSetImageIndex(MagickWand *wand,const ssize_t index)

A description of each parameter follows:

##### wand

the magick wand.

##### index

the scene number.

## MagickTransparentImage

MagickTransparentImage() changes any pixel that matches color with the color defined by fill.

The format of the MagickTransparentImage method is:

      MagickBooleanType MagickTransparentImage(MagickWand *wand,
        const PixelWand *target,const double alpha,const double fuzz)

A description of each parameter follows:

##### wand

the magick wand.

##### target

Change this target color to specified opacity value within the image.

##### alpha

the level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.

##### fuzz

By default target must match a particular pixel color exactly. However, in many cases two colors may differ by a small amount. The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color for the purposes of the floodfill.

## MagickRegionOfInterestImage

MagickRegionOfInterestImage() extracts a region of the image and returns it as a new wand.

The format of the MagickRegionOfInterestImage method is:

      MagickWand *MagickRegionOfInterestImage(MagickWand *wand,
        const size_t width,const size_t height,const ssize_t x,
        const ssize_t y)

A description of each parameter follows:

##### wand

the magick wand.

##### width

the region width.

##### height

the region height.

##### x

the region x offset.

##### y

the region y offset.

## MagickSetImagePixels

MagickSetImagePixels() accepts pixel datand stores it in the image at the location you specify. The method returns MagickFalse on success otherwise MagickTrue if an error is encountered. The pixel data can be either char, short int, int, ssize_t, float, or double in the order specified by map.

Suppose your want to upload the first scanline of a 640x480 image from character data in red-green-blue order:

      MagickSetImagePixels(wand,0,0,640,1,"RGB",CharPixel,pixels);

The format of the MagickSetImagePixels method is:

      MagickBooleanType MagickSetImagePixels(MagickWand *wand,
        const ssize_t x,const ssize_t y,const size_t columns,
        const size_t rows,const char *map,const StorageType storage,
        const void *pixels)

A description of each parameter follows:

##### wand

the magick wand.

##### x, y, columns, rows

These values define the perimeter of a region of pixels you want to define.

##### map

This string reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha (0 is transparent), O = opacity (0 is opaque), C = cyan, Y = yellow, M = magenta, K = black, I = intensity (for grayscale), P = pad.

##### storage

Define the data type of the pixels. Float and double types are expected to be normalized [0..1] otherwise [0..QuantumRange]. Choose from these types: CharPixel, ShortPixel, IntegerPixel, LongPixel, FloatPixel, or DoublePixel.

##### pixels

This array of values contain the pixel components as defined by map and type. You must preallocate this array where the expected length varies depending on the values of width, height, map, and type.

## MagickWriteImageBlob

MagickWriteImageBlob() implements direct to memory image formats. It returns the image as a blob and its length. Use MagickSetFormat() to set the format of the returned blob (GIF, JPEG, PNG, etc.).

Use MagickRelinquishMemory() to free the blob when you are done with it.

The format of the MagickWriteImageBlob method is:

      unsigned char *MagickWriteImageBlob(MagickWand *wand,size_t *length)

A description of each parameter follows:

##### wand

the magick wand.

##### length

the length of the blob.

## NewPixelView

NewPixelView() returns a pixel view required for all other methods in the Pixel View API.

The format of the NewPixelView method is:

      PixelView *NewPixelView(MagickWand *wand)

A description of each parameter follows:

##### wand

the wand.

## NewPixelViewRegion

NewPixelViewRegion() returns a pixel view required for all other methods in the Pixel View API.

The format of the NewPixelViewRegion method is:

      PixelView *NewPixelViewRegion(MagickWand *wand,const ssize_t x,
        const ssize_t y,const size_t width,const size_t height)

A description of each parameter follows:

##### wand

the magick wand.

##### x,y,columns,rows

These values define the perimeter of a region of pixel_wands view.

## PixelGetNextRow

PixelGetNextRow() returns the next row as an array of pixel wands from the pixel iterator.

The format of the PixelGetNextRow method is:

      PixelWand **PixelGetNextRow(PixelIterator *iterator,
        size_t *number_wands)

A description of each parameter follows:

##### iterator

the pixel iterator.

##### number_wands

the number of pixel wands.

## PixelIteratorGetException

PixelIteratorGetException() returns the severity, reason, and description of any error that occurs when using other methods in this API.

The format of the PixelIteratorGetException method is:

      char *PixelIteratorGetException(const Pixeliterator *iterator,
        ExceptionType *severity)

A description of each parameter follows:

##### iterator

the pixel iterator.

##### severity

the severity of the error is returned here.

## SetPixelViewIterator

SetPixelViewIterator() iterates over the pixel view in parallel and calls your set method for each scanline of the view. The pixel region is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension. The pixels are initiallly undefined and any settings you make in the callback method are automagically synced back to your image.

Use this pragma:

          #pragma omp critical

to define a section of code in your callback set method that must be executed by a single thread at a time.

The format of the SetPixelViewIterator method is:

      MagickBooleanType SetPixelViewIterator(PixelView *destination,
        SetPixelViewMethod set,void *context)

A description of each parameter follows:

##### destination

the pixel view.

##### set

the set callback method.

##### context

the user defined context.

## TransferPixelViewIterator

TransferPixelViewIterator() iterates over two pixel views in parallel and calls your transfer method for each scanline of the view. The source pixel region is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. However, the destination pixel view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.

Use this pragma:

          #pragma omp critical

to define a section of code in your callback transfer method that must be executed by a single thread at a time.

The format of the TransferPixelViewIterator method is:

      MagickBooleanType TransferPixelViewIterator(PixelView *source,
        PixelView *destination,TransferPixelViewMethod transfer,void *context)

A description of each parameter follows:

##### source

the source pixel view.

##### destination

the destination pixel view.

##### transfer

the transfer callback method.

##### context

the user defined context.

## UpdatePixelViewIterator

UpdatePixelViewIterator() iterates over the pixel view in parallel and calls your update method for each scanline of the view. The pixel region is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted. Updates to pixels in your callback are automagically synced back to the image.

Use this pragma:

          #pragma omp critical

to define a section of code in your callback update method that must be executed by a single thread at a time.

The format of the UpdatePixelViewIterator method is:

      MagickBooleanType UpdatePixelViewIterator(PixelView *source,
        UpdatePixelViewMethod update,void *context)

A description of each parameter follows:

##### source

the source pixel view.

##### update

the update callback method.

##### context

the user defined context.

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