DOKK / manpages / debian 11 / tk8.6-doc / image.3tk.en
image(3tk) Tk Built-In Commands image(3tk) 







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:



  

  
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).

  

  
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.

  

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

  

  
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.

  

  
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).

  

  
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.



  

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

  

  
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







  

    4.0
    Tk