DragonFly On-Line Manual Pages
image(n) Tk Built-In Commands image(n)
image - Create and manipulate images
image option ?arg arg ...?
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.,
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
image inuse name
Returns a boolean value indicating whether or not the image
given by name is in use by any widgets.
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).
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
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
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.
bitmap(n), options(n), photo(n)
height, image, types of images, width
Tk 4.0 image(n)