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:
imagecreatetype ?name? ?optionvalue...?
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).
imagedelete ?namename ...?
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 imagecreate, the existing instances will use the new
image.
imageheightname
Returns a decimal string giving the height of image name in pixels.
imageinusename
Returns a boolean value indicating whether or not the image given by name is in use by any
widgets.
imagenames
Returns a list containing the names of all existing images.
imagetypename
Returns the type of image name (the value of the type argument to imagecreate when the image was
created).
imagetypes
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 imagecreate).
imagewidthname
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.