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63 lines
1.5 KiB
HTML
63 lines
1.5 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>gifrotat</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>gifrotat</H1></CENTER>
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A program to rotate a GIF image by a specified angle.<P>
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<H1>Usage:</H1>
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<pre>
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gifrotat -a Angle [-q] [-s Width Height] [-h] gif-file
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</pre>
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If no gif-file is given, GifRotat will try to read a GIF file from stdin.<P>
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<H1>Memory required:</H1>
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Screen (of source image).<P>
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<H1>Options:</H1>
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<DL>
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<DT> -a Angle
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<DD> Specifies the angle to rotate in degrees with respect to
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the X (horizontal) axis.<P>
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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> [-s Width Height]
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<DD> Since the rotated image will have the same image size as
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the original, some parts of the image will by clipped out and lost. By
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specifing a (bigger) size explicitly using the `-s' option, these parts
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may be saved.<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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The image is rotated around its center. No filtering is performed on the
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output, which have the same color map as the input. This is mainly since
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filtering would require color quantization which is very memory/time intensive
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and out of MSDOS memory limits even for small images.<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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