66 lines
3.0 KiB
HTML
66 lines
3.0 KiB
HTML
<HTML><HEAD><TITLE>Tk Built-In Commands - jpeg manual page</TITLE></HEAD>
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<BR>
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<BODY bgcolor = #ffffa0>
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<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageYellow.gif"> jpeg</H2>
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<I>Create color images from JPEG files.</I><P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
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<H3><A NAME="M2">SYNOPSIS</A></H3>
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(<B>image 'create 'jpeg </B>?<I>name</I>? ?<I>options</I>?)<BR>
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<H3><A NAME="M3">DESCRIPTION</A></H3>
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JPG is a popular image file format for storing images.
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The <B>jpeg</B> image type can be used to create color images using
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JPEG files (aka <I>.jpg.</I> files).
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<H3><A NAME="M4">CREATING JPEG IMAGES</A></H3>
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Like all images, jpegs are created using the <B><A HREF=../Help/./image.n.html>image create</A></B>
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command. Jpeg images support the following <I>options</I>:
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<P>
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<DL>
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<DT><A NAME="M5">{ B:file} { Iname R}</A><DD>
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<I>name</I> gives the name of a file whose contents define the source
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image.
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<P>
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</DL>
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<H3><A NAME="M6">IMAGE PROCEDURE</A></H3>
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When a jpeg image is created, Tk also creates a new procedure whose
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name is the same as the image. This procedure may be used to invoke
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various operations on the image. It has the following general form:
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<PRE>(<I>imageName option </I>?<I>arg arg ...</I>?)</PRE>
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<I>Option</I> and the <I>arg</I>s
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determine the exact behavior of the procedure. The following
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commands are possible for jpeg images:
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<P>
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<DL>
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<DT><A NAME="M7">(<I>imageName </I><B>'cget</B> <I>option</I>)</A><DD>
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Returns the current value of the configuration option given by
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<I>option</I>. <I>Option</I> may have any of the values accepted by the
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<B>image create jpeg</B> command.
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<P>
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<DT><A NAME="M8">(<I>imageName </I><B>'configure</B> ?<I>option</I>? ?<I>value option value ...</I>?)</A><DD>
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Query or modify the configuration options for the image. If no
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<I>option</I> is specified, returns a list describing all of the
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available options for <I>imageName</I> (see <B>Tk_ConfigureInfo</B> for
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information on the format of this list). If <I>option</I> is specified
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with no <I>value</I>, then the command returns a list describing the
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one named option (this list will be identical to the corresponding
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sublist of the value returned if no <I>option</I> is specified). If
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one or more <I>option-value</I> pairs are specified, then the command
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modifies the given option(s) to have the given value(s); in this case
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the command returns an empty string. <I>Option</I> may have any of the
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values accepted by the <B>image create jpeg</B> command.
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<P>
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</DL>
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<H3><A NAME="M9">INITIALIZATION</A></H3>
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Use <B>(require "jpeg")</B> to initialize the jpeg package.
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<H3><A NAME="M10">CREDITS</A></H3>
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This implementation of the jpeg image format was done
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by Andrew Swan <I><aswan@cs.berkeley.edu></I>
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<H3><A NAME="M11">SEE ALSO</A></H3>
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<B><A HREF="./bitmap.n.html">bitmap</A></B>, <B>make-image</B>, <B><A HREF="./image.n.html">image</A></B>, <B><A HREF="./photo.n.html">photo</A></B>, <B><A HREF="./pixmap.n.html">pixmap</A></B>
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<P><IMG ALIGN=TOP SRC="./Img/line-red.gif"><P>
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<A HREF=./STk-hlp.html><IMG ALIGN=BOTTOM SRC="./Img/RefBookYellow.gif"> Back to the <B>STk</B> main page</A>
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</BODY></HTML>
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