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., ::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.
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.
bitmap(3tk),
options(3tk),
photo(3tk)
height, image, types of images, width