'\"
'\" Copyright (c) 1994 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH image n 4.0 Tk "Tk Built-In Commands"
.\" The -*- nroff -*- definitions below are for supplemental macros used
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.\" .SO ?manpage?
.\"	Start of list of standard options for a Tk widget. The manpage
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.\"
.\" .OP cmdName dbName dbClass
.\"	Start of description of a specific option.  cmdName gives the
.\"	option's name as specified in the class command, dbName gives
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.if t .wh -1.3i ^B
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.\}
.el \}\
\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
.\}
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See the \\*(So manual entry for details on the standard options.
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Command-Line Name:	\\fB\\$1\\fR
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'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
image \- Create and manipulate images
.SH SYNOPSIS
\fBimage\fI option \fR?\fIarg ...\fR?
.BE
.SH DESCRIPTION
.PP
The \fBimage\fR command is used to create, delete, and query images.
It can take several different forms, depending on the
\fIoption\fR argument.  The legal forms are:
.\" METHOD: create
.TP
\fBimage create \fItype \fR?\fIname\fR? ?\fIoption value ...\fR?
.
Creates a new image and a command with the same name and returns its name.
\fItype\fR specifies the type of the image, which must be one of
the types currently defined (e.g., \fBbitmap\fR).
\fIname\fR specifies the name for the image;  if it is omitted then
Tk picks a name of the form \fBimage\fIx\fR, where \fIx\fR is
an integer.
There may be any number of \fIoption\fR\-\fIvalue\fR 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., \fB::img::logo\fR, \fB::img::large\fR).
.\" METHOD: delete
.TP
\fBimage delete \fR?\fIname name\fR ...?
.
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 \fBimage create\fR,
the existing instances will use the new image.
.\" METHOD: height
.TP
\fBimage height \fIname\fR
.
Returns a decimal string giving the height of image \fIname\fR
in pixels.
.\" METHOD: inuse
.TP
\fBimage inuse \fIname\fR
.
Returns a boolean value indicating whether or not the image given by
\fIname\fR is in use by any widgets.
.\" METHOD: names
.TP
\fBimage names\fR
.
Returns a list containing the names of all existing images.
.\" METHOD: type
.TP
\fBimage type \fIname\fR
.
Returns the type of image \fIname\fR (the value of the \fItype\fR
argument to \fBimage create\fR when the image was created).
.\" METHOD: types
.TP
\fBimage types\fR
.
Returns a list whose elements are all of the valid image types
(i.e., all of the values that may be supplied for the \fItype\fR
argument to \fBimage create\fR).
.\" METHOD: width
.TP
\fBimage width \fIname\fR
.
Returns a decimal string giving the width of image \fIname\fR
in pixels.
.PP
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.
.SH "BUILT-IN IMAGE TYPES"
.PP
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.
.IP \fBbitmap\fR
Each pixel in the image displays a foreground color, a background
color, or nothing.
See the \fBbitmap\fR manual entry for more information.
.IP \fBphoto\fR
Displays a variety of full-color images, using dithering to
approximate colors on displays with limited color capabilities.
See the \fBphoto\fR manual entry for more information.
.IP \fBnsimage\fR
This type is only available in the Aqua platform.  It is a full-color
image which may be created from a named system image.  It has options
designed to facilitate the use of these images in buttons.  An
\fBnsimage\fR can be based on an a \fItemplate image\fR, which is an
anti-aliased 2-color image format that automatically interchanges
black and white in response to changes between the light and dark
modes on macOS.  An \fBnsimage\fR can also generate an alternate
\fIpressed\fR variant which is lighter in dark mode and darker in
light mode.  These are for use in image buttons. See the \fBnsimage\fR
manual entry for more information.
.SH "SEE ALSO"
bitmap(n), options(n), photo(n), nsimage(n)
.SH KEYWORDS
height, image, types of images, width
'\" Local Variables:
'\" mode: nroff
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