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Diffstat (limited to 'jpeg/cjpeg.1')
| -rw-r--r-- | jpeg/cjpeg.1 | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/jpeg/cjpeg.1 b/jpeg/cjpeg.1 index 7d685be58..355d34055 100644 --- a/jpeg/cjpeg.1 +++ b/jpeg/cjpeg.1 @@ -1,4 +1,4 @@ -.TH CJPEG 1 "26 July 2015" +.TH CJPEG 1 "28 April 2019" .SH NAME cjpeg \- compress an image file to a JPEG file .SH SYNOPSIS @@ -16,8 +16,9 @@ cjpeg \- compress an image file to a JPEG file compresses the named image file, or the standard input if no file is named, and produces a JPEG/JFIF file on the standard output. The currently supported input file formats are: PPM (PBMPLUS color -format), PGM (PBMPLUS grayscale format), BMP, Targa, and RLE (Utah Raster -Toolkit format). (RLE is supported only if the URT library is available.) +format), PGM (PBMPLUS grayscale format), BMP, GIF, Targa, and RLE (Utah Raster +Toolkit format). (RLE is supported only if the URT library is available, +which it isn't on most non-Unix systems.) .SH OPTIONS All switch names may be abbreviated; for example, .B \-grayscale @@ -42,10 +43,10 @@ Scale quantization tables to adjust image quality. Quality is 0 (worst) to .TP .B \-grayscale Create monochrome JPEG file from color input. Be sure to use this switch when -compressing a grayscale BMP file, because +compressing a grayscale BMP or GIF file, because .B cjpeg -isn't bright enough to notice whether a BMP file uses only shades of gray. -By saying +isn't bright enough to notice whether a BMP or GIF file uses only shades of +gray. By saying .BR \-grayscale , you'll get a smaller JPEG file that takes less time to process. .TP @@ -375,10 +376,6 @@ Communications of the ACM, April 1991 (vol. 34, no. 4), pp. 30-44. .SH AUTHOR Independent JPEG Group .SH BUGS -GIF input files are no longer supported, to avoid the Unisys LZW patent -(now expired). -(Conversion of GIF files to JPEG is usually a bad idea anyway.) -.PP Not all variants of BMP and Targa file formats are supported. .PP The |