Skip to page contents

[ AllocateImage | AllocateImageColormap | AllocateNextImage | AppendImages | The Average | CatchImageException | ClipPathImage | CloneImage | CloneImages | CloneImageInfo | CombineImages | CycleColormap | DestroyImage | DestroyImageInfo | GetImageClipMask | GetImageException | GetImageInfo | GetImageType | IsTaintImage | ModifyImage | NewMagickImage | PlasmaImage | ReferenceImage | SetImageBackgroundColor | SetImageClipMask | SetImageExtent | SetImageInfoBlob | SetImageInfoFile | SetImageOpacity | SetImageType | StripImage | TextureImage ]

AllocateImage() returns a pointer to an image structure initialized to default values.

The format of the AllocateImage method is:

  Image *AllocateImage(const ImageInfo *image_info)

A description of each parameter follows:

image_info

Many of the image default values are set from this structure. For example, filename, compression, depth, background color, and others.

AllocateImageColormap() allocates an image colormap and initializes it to a linear gray colorspace. If the image already has a colormap, it is replaced. AllocateImageColormap() returns MagickTrue if successful, otherwise MagickFalse if there is not enough memory.

The format of the AllocateImageColormap method is:

  MagickBooleanType AllocateImageColormap(Image *image,
    const unsigned long colors)

A description of each parameter follows:

image

The image.

colors

The number of colors in the image colormap.

AllocateNextImage() initializes the next image in a sequence to default values. The next member of image points to the newly allocated image. If there is a memory shortage, next is assigned NULL.

The format of the AllocateNextImage method is:

  void AllocateNextImage(const ImageInfo *image_info,Image *image)

A description of each parameter follows:

image_info

Many of the image default values are set from this structure. For example, filename, compression, depth, background color, and others.

image

The image.

AppendImages() takes all images from the current image pointer to the end of the image list and and appends them to each other top-to-bottom if the stack parameter is true, otherwise left-to-right.

The format of the AppendImage method is:

  Image *AppendImages(const Image *image,const MagickBooleanType stack,
    ExceptionInfo *exception)

A description of each parameter follows:

image

The image sequence.

stack

A value other than 0 stacks the images top-to-bottom.

exception

Return any errors or warnings in this structure.

The Average() method takes a set of images and averages them together. Each image in the set must have the same width and height. Average() returns a single image with each corresponding pixel component of each image averaged. On failure, a NULL image is returned and exception describes the reason for the failure.

The format of the AverageImage method is:

  Image *AverageImages(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image

The image sequence.

exception

Return any errors or warnings in this structure.

CatchImageException() returns if no exceptions are found in the image sequence, otherwise it determines the most severe exception and reports it as a warning or error depending on the severity.

The format of the CatchImageException method is:

  ExceptionType CatchImageException(Image *image)

A description of each parameter follows:

image

An image sequence.

ClipPathImage() sets the image clip mask based any clipping path information if it exists.

The format of the ClipImage method is:

  MagickBooleanType ClipPathImage(Image *image,const char *pathname,
    const MagickBooleanType inside)

A description of each parameter follows:

image

The image.

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.

CloneImage() copies an image and returns the copy as a new image object. If the specified columns and rows is 0, an exact copy of the image is returned, otherwise the pixel data is undefined and must be initialized with the SetImagePixels() and SyncImagePixels() methods. On failure, a NULL image is returned and exception describes the reason for the failure.

The format of the CloneImage method is:

  Image *CloneImage(const Image *image,const unsigned long columns,
    const unsigned long rows,const MagickBooleanType orphan,
    ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

columns

The number of columns in the cloned image.

rows

The number of rows in the cloned image.

orphan

With a value other than 0, the cloned image is an orphan. An orphan is a stand-alone image that is not assocated with an image list. In effect, the next and previous members of the cloned image is set to NULL.

exception

Return any errors or warnings in this structure.

CloneImages() clones one or more images from an image sequence.

The format of the CloneImages method is:

  Image *CloneImages(const Image *image,const char *scenes,
    ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

scenes

This character string specifies which scenes to clone (e.g. 1,3-5,7-6,2).

exception

Return any errors or warnings in this structure.

CloneImageInfo() makes a copy of the given image info structure. If NULL is specified, a new image info structure is created initialized to default values.

The format of the CloneImageInfo method is:

  ImageInfo *CloneImageInfo(const ImageInfo *image_info)

A description of each parameter follows:

image_info

The image info.

CombineImages() combines one or more images into a single image. The grayscale value of the pixels of each image in the sequence is assigned in order to the specified channels of the combined image. The typical ordering would be image 1 => Red, 2 => Green, 3 => Blue, etc.

The format of the CombineImages method is:

  Image *CombineImages(const Image *image,const ChannelType channel,
    ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

exception

Return any errors or warnings in this structure.

CycleColormap() displaces an image's colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychodelic effect.

The format of the CycleColormapImage method is:

  MagickBooleanType CycleColormapImage(Image *image,const long displace)

A description of each parameter follows:

image

The image.

displace

displace the colormap this amount.

DestroyImage() dereferences an image, deallocating memory associated with the image if the reference count becomes zero.

The format of the DestroyImage method is:

  Image *DestroyImage(Image *image)

A description of each parameter follows:

image

The image.

DestroyImageInfo() deallocates memory associated with an ImageInfo structure.

The format of the DestroyImageInfo method is:

  ImageInfo *DestroyImageInfo(ImageInfo *image_info)

A description of each parameter follows:

image_info

The image info.

GetImageClipMask() returns the clip mask associated with the image.

The format of the GetImageClipMask method is:

  Image *GetImageClipMask(const Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

GetImageException() traverses an image sequence and returns any error more severe than noted by the exception parameter.

The format of the GetImageException method is:

  void GetImageException(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image

Specifies a pointer to a list of one or more images.

exception

return the highest severity exception.

GetImageInfo() initializes image_info to default values.

The format of the GetImageInfo method is:

  void GetImageInfo(ImageInfo *image_info)

A description of each parameter follows:

image_info

The image info.

GetImageType() returns the potential type of image:

Bilevel Grayscale GrayscaleMatte Palette PaletteMatte TrueColor TrueColorMatte ColorSeparation ColorSeparationMatte

To ensure the image type matches its potential, use SetImageType():

      (void) SetImageType(image,GetImageType(image));

The format of the GetImageType method is:

  ImageType GetImageType(const Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

exception

Return any errors or warnings in this structure.

IsTaintImage() returns a value other than 0 if any pixel in the image has been altered since it was first constituted.

The format of the IsTaintImage method is:

  MagickBooleanType IsTaintImage(const Image *image)

A description of each parameter follows:

image

The image.

ModifyImage() ensures that there is only a single reference to the image to be modified, updating the provided image pointer to point to a clone of the original image if necessary.

The format of the ModifyImage method is:

  ModifyImage(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image

The image.

exception

Return any errors or warnings in this structure.

NewMagickImage() creates a blank image canvas of the specified size and background color.

The format of the NewMagickImage method is:

  Image *NewMagickImage(const ImageInfo *image_info,
    const unsigned long width,const unsigned long height,
    const MagickPixelPacket *background)

A description of each parameter follows:

image

The image.

width

The image width.

height

The image height.

background

The image color.

PlasmaImage() initializes an image with plasma fractal values. The image must be initialized with a base color and the random number generator seeded before this method is called.

The format of the PlasmaImage method is:

  MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
    unsigned long attenuate,unsigned long depth)

A description of each parameter follows:

image

The image.

segment

Define the region to apply plasma fractals values.

attenuate

Define the plasma attenuation factor.

depth

Limit the plasma recursion depth.

ReferenceImage() increments the reference count associated with an image returning a pointer to the image.

The format of the ReferenceImage method is:

  Image *ReferenceImage(Image *image)

A description of each parameter follows:

image

The image.

SetImageBackgroundColor() initializes the image pixels to the image background color. The background color is defined by the background_color member of the image structure.

The format of the SetImage method is:

  void SetImageBackgroundColor(Image *image)

A description of each parameter follows:

image

The image.

SetImageClipMask() associates a clip mask with the image. The clip mask must be the same dimensions as the image. Set any pixel component of the clip mask to TransparentOpacity to prevent that corresponding image pixel component from being updated when SyncImagePixels() is applied.

The format of the SetImageClipMask method is:

  MagickBooleanType SetImageClipMask(Image *image,const Image *clip_mask)

A description of each parameter follows:

image

The image.

clip_mask

The image clip mask.

SetImageExtent() sets the image size (i.e. columns & rows).

The format of the SetImageExtent method is:

  MagickBooleanType SetImageExtent(Image *image,const unsigned long columns,
    const unsigned long rows)

A description of each parameter follows:

image

The image.

columns

The image width in pixels.

rows

The image height in pixels.

SetImageInfoBlob() sets the image info blob member.

The format of the SetImageInfoBlob method is:

  void SetImageInfoBlob(ImageInfo *image_info,const void *blob,
    const size_t length)

A description of each parameter follows:

image_info

The image info.

blob

The blob.

length

The blob length.

SetImageInfoFile() sets the image info file member.

The format of the SetImageInfoFile method is:

  void SetImageInfoFile(ImageInfo *image_info,FILE *file)

A description of each parameter follows:

image_info

The image info.

file

The file.

SetImageOpacity() attenuates the opacity channel of an image. If the image pixels are opaque, they are set to the specified opacity level. Otherwise, the pixel oapcity values are blended with the supplied transparency value.

The format of the SetImageOpacity method is:

  void SetImageOpacity(Image *image,const Quantum opacity)

A description of each parameter follows:

image

The image.

opacity

The level of transparency: 0 is fully opaque and QuantumRange is fully transparent.

SetImageType() sets the type of image. Choose from these types:

Bilevel Grayscale GrayscaleMatte Palette PaletteMatte TrueColor TrueColorMatte ColorSeparation ColorSeparationMatte OptimizeType

The format of the SetImageType method is:

  MagickBooleanType SetImageType(Image *image,const ImageType image_type)

A description of each parameter follows:

image

The image.

image_type

Image type.

StripImage() strips an image of all profiles and comments.

The format of the StripImage method is:

  MagickBooleanType StripImage(Image *image)

A description of each parameter follows:

image

The image.

TextureImage() repeatedly tiles the texture image across and down the image canvas.

The format of the TextureImage method is:

  MagickBooleanType TextureImage(Image *image,const Image *texture)

A description of each parameter follows:

image

The image.

texture

This image is the texture to layer on the background.