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87 lines
2.3 KiB
HTML
87 lines
2.3 KiB
HTML
<!doctype HTML public "-//W3O//DTD W3 HTML 2.0//EN">
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<HTML>
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<HEAD>
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<TITLE>gifbg</TITLE>
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<link rev=made href=mailto:esr@snark.thyrsus.com>
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</HEAD>
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<BODY>
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Go to <a href="index.html">index page</a>.
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<CENTER><H1>gifbg</H1></CENTER>
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A program to generate a single-color test pattern GIF with gradually changing
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intensity in any of the basic 8 directions.<P>
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<H1>Usage:</H1>
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<pre>
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gifbg [-q] [-d Dir] [-l #Lvls] [-c R G B] [-m MinI] [-M MaxI] [-s W H] [-h]
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</pre>
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The gifbg program reads no input, and will dump the created GIF file
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to stdout.<P>
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<H1>Memory required:</H1>
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Line.
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<H1>Options:</H1>
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<DL>
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<DT> [-q]
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<DD> Quiet mode. Defaults off on MSDOS, on under UNIX. Controls printout
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of running scan lines. Use -q- to invert.<P>
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<DT> [-d Dir]
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<DD> Select direction the intensity of the background should increase.
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Direction can be one of the 8 principal directions:<P>
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<pre>
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"T" - for Top "TR" - for Top Right
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"R" - for Right "BR" - for Bottom Right
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"B" - for Bottom "BL" - for Bottom Left
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"L" - for left "TL" - for Top Left
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</pre>
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The compass directions may be use as synonyms for the above directions, so
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for example "NE" is equal to "TR".<P>
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Direction is case insensitive. The default direction is Top (North).<P>
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<DT> [-l #Lvls]
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<DD> Number of levels the color will be scaled to. Default is 16.<P>
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<DT> [-c R G B]
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<DD> What to use as the primary background color to scale.
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This color is scaled between the minimum intensity (MinI) and maximum
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intensity (MaxI) from one end of the screen to the other as defined by Dir.
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See below (-m & -M) for MinI & MaxI. Default is Blue (0, 0, 255).<P>
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<DT> [-m MinI]
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<DD> Minimum intensity (in percent) to scale color. Default 10%<P>
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<DT> [-M MaxI]
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<DD> Maximum intensity (in percent) to scale color. Default 100%<P>
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<DT> [-s W H]
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<DD> Size of image to create. Default 640 by 350.<P>
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<DT> [-h]
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<DD> Print one line of command line help, similar to Usage above.<P>
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</DL>
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<H1>Notes:</H1>
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If MinI == MaxI = 100 (%) and #Lvls == 2 then boolean mask image of specified
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size will be created - all foreground. This can be used as a square mask for
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the <a href="gifcomb.html"></a>gifcomb utility.<P>
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<H1>Author:</H1>
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Gershon Elber
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<HR>
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<ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com"><esr@snark.thyrsus.com></A></ADDRESS>
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</BODY>
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</HTML>
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