Tk Built-In Commands - jpeg manual page

## jpeg

Create color images from JPEG files.

### SYNOPSIS

(image 'create 'jpeg ?name? ?options?)

### DESCRIPTION

JPG is a popular image file format for storing images. The jpeg image type can be used to create color images using JPEG files (aka .jpg. files).

### CREATING JPEG IMAGES

Like all images, jpegs are created using the image create command. Jpeg images support the following options:

{ B:file} { Iname R}
  name gives the name of a file whose contents define the source image.

### IMAGE PROCEDURE

When a jpeg image is created, Tk also creates a new procedure whose name is the same as the image. This procedure may be used to invoke various operations on the image. It has the following general form:

    (imageName option ?arg arg ...?)

Option and the args determine the exact behavior of the procedure. The following commands are possible for jpeg images:

(imageName 'cget option)
  Returns the current value of the configuration option given by option. Option may have any of the values accepted by the image create jpeg command.

(imageName 'configure ?option? ?value option value ...?)
  Query or modify the configuration options for the image. If no option is specified, returns a list describing all of the available options for imageName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or more option-value pairs are specified, then the command modifies the given option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the image create jpeg command.

### INITIALIZATION

Use (require "jpeg") to initialize the jpeg package.

### CREDITS

This implementation of the jpeg image format was done by Andrew Swan <aswan@cs.berkeley.edu>

### SEE ALSO

bitmap, make-image, image, photo, pixmap

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