7.1.412. djpegΒΆ

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usage: djpeg [switches] [inputfile] Switches (names may be abbreviated):

-colors N Reduce image to no more than N colors
-fast Fast, low-quality processing
-grayscale Force grayscale output
-scale M/N Scale output image by fraction M/N, eg, 1/8
-bmp Select BMP output format (Windows style)
-gif Select GIF output format
-os2 Select BMP output format (OS/2 style)
-pnm Select PBMPLUS (PPM/PGM) output format (default)
-targa Select Targa output format

Switches for advanced users:

-dct int Use integer DCT method (default) -dct fast Use fast integer DCT (less accurate) -dct float Use floating-point DCT method
-dither fs Use F-S dithering (default) -dither none Don’t use dithering in quantization -dither ordered Use ordered dither (medium speed, quality)
-map FILE Map to colors used in named image file
-nosmooth Don’t use high-quality upsampling
-onepass Use 1-pass quantization (fast, low quality)
-maxmemory N Maximum memory to use (in kbytes)
-outfile name Specify name for output file
-verbose or -debug Emit debug output

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