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Output a GIF file with Perl, set width, height and color

by true (Pilgrim)
on Oct 15, 2002 at 22:49 UTC ( #205544=note: print w/ replies, xml ) Need Help??


in reply to Re: On-demand single-pixel GIFs
in thread On-demand single-pixel GIFs

Here's another take on the same idea.
I often find myself wanting to output
temporary color spacer gif's for html design
and layout purposes.
Adjust the width, height and color of
a gif file and output without an image module (ie ImageMagick, GD).

#!/usr/bin/perl -w # this script outputs a gif # set color, width, and height use strict; &printGIF("0000FF","33","10"); ###################################### sub printGIF{ my $color = $_[0]; my $WH = sprintf("%lX",$_[1]); my $HH = sprintf("%lX",$_[2]); $color =~ s/(..)(..)(..)/$1\|$2\|$3/; my($RH,$GH,$BH)=split(/\|/,$color); print STDOUT "Content-type:image/gif\n\n"; my @gif=( "47", "49", "46", "38", "37", "61", "$WH", "00", "$HH", "00", "A1", "01", "00", "$RH", "$GH", "$BH", "FF", "FF", "FF", "00", "00", "00", "00", "00", "00", "21", "F9", "04", "05", "00", "00", "01", "00", "2C", "00", "00", "00", "00", "$WH", "00", "$HH", "00", "40", "02", "$HH", "84", "8F", "A9", "CB", "ED", "0F", "A3", "9C", "B4", "DA", "8B", "B3", "DE", "9C", "17", "00", "3B" ); binmode (STDOUT); # if needed foreach my $bit(@gif){ my $bita = hex($bit); $bita = pack("C",$bita); print STDOUT $bita; } }#################################### end printGIF
jtrue


Comment on Output a GIF file with Perl, set width, height and color
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Re^3: On-demand single-pixel GIFs
by Aristotle (Chancellor) on Oct 16, 2002 at 11:52 UTC

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