Wordsmith GIF limitations in cjpeg.1/djpeg.1
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6
cjpeg.1
6
cjpeg.1
@@ -1,4 +1,4 @@
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.TH CJPEG 1 "17 December 2015"
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.TH CJPEG 1 "17 February 2016"
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.SH NAME
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cjpeg \- compress an image file to a JPEG file
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.SH SYNOPSIS
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@@ -337,11 +337,11 @@ Independent JPEG Group
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This file was modified by The libjpeg-turbo Project to include only information
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relevant to libjpeg-turbo, to wordsmith certain sections, and to describe
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features not present in libjpeg.
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.SH BUGS
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.SH ISSUES
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Support for GIF input files was removed in cjpeg v6b due to concerns over
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the Unisys LZW patent. Although this patent expired in 2006, cjpeg still
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lacks GIF support, for these historical reasons. (Conversion of GIF files to
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JPEG is usually a bad idea anyway.)
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JPEG is usually a bad idea anyway, since GIF is a 256-color format.)
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.PP
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Not all variants of BMP and Targa file formats are supported.
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.PP
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14
djpeg.1
14
djpeg.1
@@ -1,4 +1,4 @@
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.TH DJPEG 1 "26 June 2015"
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.TH DJPEG 1 "17 February 2016"
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.SH NAME
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djpeg \- decompress a JPEG file to an image file
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.SH SYNOPSIS
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@@ -281,8 +281,10 @@ Independent JPEG Group
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This file was modified by The libjpeg-turbo Project to include only information
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relevant to libjpeg-turbo, to wordsmith certain sections, and to describe
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features not present in libjpeg.
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.SH BUGS
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To avoid the Unisys LZW patent,
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.B djpeg
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produces uncompressed GIF files. These are larger than they should be, but
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are readable by standard GIF decoders.
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.SH ISSUES
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Support for compressed GIF output files was removed in djpeg v6b due to
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concerns over the Unisys LZW patent. Although this patent expired in 2006,
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djpeg still lacks compressed GIF support, for these historical reasons.
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(Conversion of JPEG files to GIF is usually a bad idea anyway, since GIF is a
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256-color format.) The uncompressed GIF files that djpeg generates are larger
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than they should be, but they are readable by standard GIF decoders.
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