AdaptiveResizeImage() adaptively resize image with pixel resampling.

The format of the AdaptiveResizeImage method is:

  Image *AdaptiveResizeImage(const Image *image,
    const unsigned long columns,const unsigned long rows,
    ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the resized image.

rows

the number of rows in the resized image.

exception

return any errors or warnings in this structure.

MagnifyImage() is a convenience method that scales an image proportionally to twice its size.

The format of the MagnifyImage method is:

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

A description of each parameter follows:

image

the image.

exception

return any errors or warnings in this structure.

MinifyImage() is a convenience method that scales an image proportionally to half its size.

The format of the MinifyImage method is:

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

A description of each parameter follows:

image

the image.

exception

return any errors or warnings in this structure.

ResampleImage() resize image in terms of its pixel size, so that when displayed at the given resolution it will be the same size in terms of real world units as the original image at the original resolution.

The format of the ResampleImage method is:

  Image *ResampleImage(Image *image,const double x_resolution,
    const double y_resolution,const FilterTypes filter,const double blur,
    ExceptionInfo *exception)

A description of each parameter follows:

image

the image to be resized to fit the given resolution.

x_resolution

the new image x resolution.

y_resolution

the new image y resolution.

filter

Image filter to use.

blur

the blur factor where > 1 is blurry, < 1 is sharp.

LiquidRescaleImage() rescales image with seam carving.

The format of the LiquidRescaleImage method is:

  Image *LiquidRescaleImage(const Image *image,
    const unsigned long columns,const unsigned long rows,
    const double delta_x,const double rigidity,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the rescaled image.

rows

the number of rows in the rescaled image.

delta_x

maximum seam transversal step (0 means straight seams).

rigidity

introduce a bias for non-straight seams (typically 0).

exception

return any errors or warnings in this structure.

ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo() ).

If an undefined filter is given the filter defaults to Mitchell for a colormapped image, a image with a matte channel, or if the image is enlarged. Otherwise the filter defaults to a Lanczos.

ResizeImage() was inspired by Paul Heckbert's "zoom" program.

The format of the ResizeImage method is:

  Image *ResizeImage(Image *image,const unsigned long columns,
    const unsigned long rows,const FilterTypes filter,const double blur,
    ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the scaled image.

rows

the number of rows in the scaled image.

filter

Image filter to use.

blur

the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.

exception

return any errors or warnings in this structure.

SampleImage() scales an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.

The format of the SampleImage method is:

  Image *SampleImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the sampled image.

rows

the number of rows in the sampled image.

exception

return any errors or warnings in this structure.

ScaleImage() changes the size of an image to the given dimensions.

The format of the ScaleImage method is:

  Image *ScaleImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the scaled image.

rows

the number of rows in the scaled image.

exception

return any errors or warnings in this structure.

ThumbnailImage() changes the size of an image to the given dimensions and removes any associated profiles. The goal is to produce small low cost thumbnail images suited for display on the Web.

The format of the ThumbnailImage method is:

  Image *ThumbnailImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

the number of columns in the scaled image.

rows

the number of rows in the scaled image.

exception

return any errors or warnings in this structure.

ZoomImage() creates a new image that is a scaled size of an existing one. It allocates the memory necessary for the new Image structure and returns a pointer to the new image. The Point filter gives fast pixel replication, Triangle is equivalent to bi-linear interpolation, and Mitchel giver slower, very high-quality results. See Graphic Gems III for details on this algorithm.

The filter member of the Image structure specifies which image filter to use. Blur specifies the blur factor where > 1 is blurry, < 1 is sharp.

The format of the ZoomImage method is:

  Image *ZoomImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

columns

An integer that specifies the number of columns in the zoom image.

rows

An integer that specifies the number of rows in the scaled image.

exception

return any errors or warnings in this structure.