ImageMagick: MagickCore, C API for ImageMagick: Image Methods

AcquireImage • AcquireImageInfo • AcquireNextImage • AppendImages • CatchImageException • ClipImagePath • CloneImage • CloneImageInfo • CopyImagePixels • DestroyImage • DestroyImageInfo • GetImageInfo • GetImageInfoFile • GetImageMask • GetImageVirtualPixelMethod • InterpretImageFilename • IsHighDynamicRangeImage • IsImageObject • IsTaintImage • ModifyImage • NewMagickImage • ReferenceImage • ResetImagePage • SetImageBackgroundColor • SetImageChannelMask • SetImageColor • SetImageStorageClass • SetImageExtent • SetImageInfoBlob • SetImageInfoFile • SetImageMask • SetImageAlpha • SetImageVirtualPixelMethod • SmushImages • StripImage • SyncImageSettings

AcquireImage

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

The format of the AcquireImage method is:

Image *AcquireImage(const ImageInfo *image_info,ExceptionInfo *exception)

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.
exception: return any errors or warnings in this structure.

AcquireImageInfo

AcquireImageInfo() allocates the ImageInfo structure.

The format of the AcquireImageInfo method is:

ImageInfo *AcquireImageInfo(void)

AcquireNextImage

AcquireNextImage() 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 AcquireNextImage method is:

void AcquireNextImage(const ImageInfo *image_info,Image *image,
  ExceptionInfo *exception)

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.
exception: return any errors or warnings in this structure.

AppendImages

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

The current gravity setting effects how the image is justified in the final image.

The format of the AppendImages method is:

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

A description of each parameter follows:

images: the image sequence.
stack: A value other than 0 stacks the images top-to-bottom.
exception: return any errors or warnings in this structure.

CatchImageException

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.

ClipImagePath

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

The format of the ClipImagePath method is:

MagickBooleanType ClipImagePath(Image *image,const char *pathname,
  const MagickBooleanType inside,ExceptionInfo *exception)

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.
exception: return any errors or warnings in this structure.

CloneImage

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 QueueAuthenticPixels() and SyncAuthenticPixels() 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 size_t columns,
  const size_t 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.
detach: With a value other than 0, the cloned image is detached from its parent I/O stream.
exception: return any errors or warnings in this structure.

CloneImageInfo

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.

CopyImagePixels

CopyImagePixels() copies pixels from the source image as defined by the geometry the destination image at the specified offset.

The format of the CopyImagePixels method is:

MagickBooleanType CopyImagePixels(Image *image,const Image *source_image,
  const RectangleInfo *geometry,const OffsetInfo *offset,
  ExceptionInfo *exception);

A description of each parameter follows:

image: the destination image.
source_image: the source image.
geometry: define the dimensions of the source pixel rectangle.
offset: define the offset in the destination image.
exception: return any errors or warnings in this structure.

DestroyImage

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

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.

GetImageInfo

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.

GetImageInfoFile

GetImageInfoFile() returns the image info file member.

The format of the GetImageInfoFile method is:

FILE *GetImageInfoFile(const ImageInfo *image_info)

A description of each parameter follows:

image_info: the image info.

GetImageMask

GetImageMask() returns the mask associated with the image.

The format of the GetImageMask method is:

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

A description of each parameter follows:

image: the image.

GetImageVirtualPixelMethod

GetImageVirtualPixelMethod() gets the "virtual pixels" method for the image. A virtual pixel is any pixel access that is outside the boundaries of the image cache.

The format of the GetImageVirtualPixelMethod() method is:

VirtualPixelMethod GetImageVirtualPixelMethod(const Image *image)

A description of each parameter follows:

image: the image.

InterpretImageFilename

InterpretImageFilename() interprets embedded characters in an image filename. The filename length is returned.

The format of the InterpretImageFilename method is:

size_t InterpretImageFilename(const ImageInfo *image_info,Image *image,
  const char *format,int value,char *filename,ExceptionInfo *exception)

A description of each parameter follows.

image_info

the image info..

image

the image.

format

A filename describing the format to use to write the numeric argument. Only the first numeric format identifier is replaced.

value

Numeric value to substitute into format filename.

filename

return the formatted filename in this character buffer.

exception

return any errors or warnings in this structure.

IsHighDynamicRangeImage

IsHighDynamicRangeImage() returns MagickTrue if any pixel component is non-integer or exceeds the bounds of the quantum depth (e.g. for Q16 0..65535.

The format of the IsHighDynamicRangeImage method is:

MagickBooleanType IsHighDynamicRangeImage(const Image *image,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
exception: return any errors or warnings in this structure.

IsImageObject

IsImageObject() returns MagickTrue if the image sequence contains a valid set of image objects.

The format of the IsImageObject method is:

MagickBooleanType IsImageObject(const Image *image)

A description of each parameter follows:

image: the image.

IsTaintImage

IsTaintImage() returns MagickTrue 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

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:

MagickBooleanType ModifyImage(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
exception: return any errors or warnings in this structure.

NewMagickImage

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 size_t width,
  const size_t height,const PixelInfo *background,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
width: the image width.
height: the image height.
background: the image color.
exception: return any errors or warnings in this structure.

ReferenceImage

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.

ResetImagePage

ResetImagePage() resets the image page canvas and position.

The format of the ResetImagePage method is:

MagickBooleanType ResetImagePage(Image *image,const char *page)

A description of each parameter follows:

image: the image.
page: the relative page specification.

SetImageBackgroundColor

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:

MagickBooleanType SetImageBackgroundColor(Image *image,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
exception: return any errors or warnings in this structure.

SetImageChannelMask

SetImageChannelMask() sets the image channel mask from the specified channel mask.

The format of the SetImageChannelMask method is:

ChannelType SetImageChannelMask(Image *image,
  const ChannelType channel_mask)

A description of each parameter follows:

image: the image.
channel_mask: the channel mask.

SetImageColor

SetImageColor() set the entire image canvas to the specified color.

The format of the SetImageColor method is:

MagickBooleanType SetImageColor(Image *image,const PixelInfo *color,
  ExeptionInfo *exception)

A description of each parameter follows:

image: the image.
background: the image color.
exception: return any errors or warnings in this structure.

SetImageStorageClass

SetImageStorageClass() sets the image class: DirectClass for true color images or PseudoClass for colormapped images.

The format of the SetImageStorageClass method is:

MagickBooleanType SetImageStorageClass(Image *image,
  const ClassType storage_class,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
storage_class: The image class.
exception: return any errors or warnings in this structure.

SetImageExtent

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

The format of the SetImageExtent method is:

MagickBooleanType SetImageExtent(Image *image,const size_t columns,
  const size_t rows,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
columns: The image width in pixels.
rows: The image height in pixels.
exception: return any errors or warnings in this structure.

SetImageInfoBlob

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

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.

SetImageMask

SetImageMask() associates a mask with the image. The mask must be the same dimensions as the image.

The format of the SetImageMask method is:

MagickBooleanType SetImageMask(Image *image,const PixelMask type,
  const Image *mask,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
type: the mask type, ReadPixelMask or WritePixelMask.
mask: the image mask.
exception: return any errors or warnings in this structure.

SetImageAlpha

SetImageAlpha() sets the alpha levels of the image.

The format of the SetImageAlpha method is:

MagickBooleanType SetImageAlpha(Image *image,const Quantum alpha,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
Alpha: the level of transparency: 0 is fully opaque and QuantumRange is fully transparent.

SetImageVirtualPixelMethod

SetImageVirtualPixelMethod() sets the "virtual pixels" method for the image and returns the previous setting. A virtual pixel is any pixel access that is outside the boundaries of the image cache.

The format of the SetImageVirtualPixelMethod() method is:

VirtualPixelMethod SetImageVirtualPixelMethod(Image *image,
  const VirtualPixelMethod virtual_pixel_method,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
virtual_pixel_method: choose the type of virtual pixel.
exception: return any errors or warnings in this structure.

SmushImages

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

The current gravity setting now effects how the image is justified in the final image.

The format of the SmushImages method is:

Image *SmushImages(const Image *images,const MagickBooleanType stack,
  ExceptionInfo *exception)

A description of each parameter follows:

images: the image sequence.
stack: A value other than 0 stacks the images top-to-bottom.
offset: minimum distance in pixels between images.
exception: return any errors or warnings in this structure.

StripImage

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

The format of the StripImage method is:

MagickBooleanType StripImage(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
exception: return any errors or warnings in this structure.

SyncImageSettings

SyncImageSettings() syncs any image_info global options into per-image attributes.

Note: in IMv6 free form 'options' were always mapped into 'artifacts', so that operations and coders can find such settings. In IMv7 if a desired per-image artifact is not set, then it will directly look for a global option as a fallback, as such this copy is no longer needed, only the link set up.

The format of the SyncImageSettings method is:

MagickBooleanType SyncImageSettings(const ImageInfo *image_info,
  Image *image,ExceptionInfo *exception)
MagickBooleanType SyncImagesSettings(const ImageInfo *image_info,
  Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image_info: the image info.
image: the image.
exception: return any errors or warnings in this structure.