Tcl8.5.16/Tk8.5.16 Documentation > TkCmd > image

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NAME
image - Create and manipulate images
SYNOPSIS
DESCRIPTION
image create type ?name? ?option value ...?
image delete ?name name ...?
image height name
image inuse name
image names
image type name
image types
image width name
BUILT-IN IMAGE TYPES
bitmap
photo
SEE ALSO
KEYWORDS

NAME

image - Create and manipulate images

SYNOPSIS

image option ?arg arg ...?

DESCRIPTION

The image command is used to create, delete, and query images. It can take several different forms, depending on the option argument. The legal forms are:

image create type ?name? ?option value ...?
Creates a new image and a command with the same name and returns its name. type specifies the type of the image, which must be one of the types currently defined (e.g., bitmap). name specifies the name for the image; if it is omitted then Tk picks a name of the form imagex, where x is an integer. There may be any number of option-value pairs, which provide configuration options for the new image. The legal set of options is defined separately for each image type; see below for details on the options for built-in image types. If an image already exists by the given name then it is replaced with the new image and any instances of that image will redisplay with the new contents. It is important to note that the image command will silently overwrite any procedure that may currently be defined by the given name, so choose the name wisely. It is recommended to use a separate namespace for image names (e.g., ::img::logo, ::img::large).

image delete ?name name ...?
Deletes each of the named images and returns an empty string. If there are instances of the images displayed in widgets, the images will not actually be deleted until all of the instances are released. However, the association between the instances and the image manager will be dropped. Existing instances will retain their sizes but redisplay as empty areas. If a deleted image is recreated with another call to image create, the existing instances will use the new image.

image height name
Returns a decimal string giving the height of image name in pixels.

image inuse name
Returns a boolean value indicating whether or not the image given by name is in use by any widgets.

image names
Returns a list containing the names of all existing images.

image type name
Returns the type of image name (the value of the type argument to image create when the image was created).

image types
Returns a list whose elements are all of the valid image types (i.e., all of the values that may be supplied for the type argument to image create).

image width name
Returns a decimal string giving the width of image name in pixels.

Additional operations (e.g. writing the image to a file) may be available as subcommands of the image instance command. See the manual page for the particular image type for details.

BUILT-IN IMAGE TYPES

The following image types are defined by Tk so they will be available in any Tk application. Individual applications or extensions may define additional types.

bitmap
Each pixel in the image displays a foreground color, a background color, or nothing. See the bitmap manual entry for more information.

photo
Displays a variety of full-color images, using dithering to approximate colors on displays with limited color capabilities. See the photo manual entry for more information.

SEE ALSO

bitmap, options, photo

KEYWORDS

height, image, types of images, width
Copyright © 1995-1997 Roger E. Critchlow Jr. Copyright © 1994 The Regents of the University of California. Copyright © 1994-1996 Sun Microsystems, Inc.