Lines Matching refs:quality
70 -quality N[,...] Scale quantization tables to adjust image quality.
92 memory. Image quality and speed of decompression are
108 The -quality switch lets you trade off compressed file size against quality of
109 the reconstructed image: the higher the quality setting, the larger the JPEG
111 you want to use the lowest quality setting (smallest file) that decompresses
113 purpose the quality setting should be between 50 and 95; the default of 75 is
114 often about right. If you see defects at -quality 75, then go up 5 or 10
118 -quality 100 will generate a quantization table of all 1's, minimizing loss
123 in output image quality.
125 In the other direction, quality values below 50 will produce very small files
126 of low image quality. Settings around 5 to 10 might be useful in preparing an
127 index of a large image library, for example. Try -quality 2 (or so) for some
128 amusing Cubist effects. (Note: quality values below about 25 generate 2-byte
130 cjpeg emits a warning message when you give such a quality value, because some
132 if you need to ensure compatibility at low quality values.)
134 The -quality option has been extended in IJG version 7 for support of separate
135 quality settings for luminance and chrominance (or in general, for every
136 provided quantization table slot). This feature is useful for high-quality
141 Note that the -quality ratings refer to the quantization table slots, and that
150 quality selection, since the default value used by library is 2x2!
153 JPEG file, the data is stored in multiple scans of increasing quality. If the
155 the first scan to display a low-quality image very quickly, and can then
157 equivalent to a standard JPEG file of the same quality setting, and the total
170 smaller values produce higher quality
172 default quality of 75 and default Luminance qtable
201 For example, cjpeg -bgycc -quality 80,90 will give
202 similar results as cjpeg -quality 80.
222 -nosmooth Don't use high-quality downsampling.
259 even at low quality settings. (This switch is poorly
292 quality output. (The default options are chosen for
293 highest quality output.) Currently, this is equivalent
362 between speed and quality; no dithering is fast but
374 -nosmooth Don't use high-quality upsampling.
378 but it produces a lower-quality image. -onepass is
399 GIF to JPEG, you should experiment with cjpeg's -quality and -smooth options
403 cycles. Image quality loss will accumulate; after ten or so cycles the image
410 quality settings to make very small JPEG files; the percentage improvement
424 Several options are available that trade off image quality to gain speed.
427 "-dct fast" and/or "-nosmooth" gain speed at a small sacrifice in quality.
429 much lower quality than the default behavior. "-dither none" may give
440 decompress, with some loss of image quality, by specifying -onepass for
495 quality. However, while the image data is losslessly transformed, metadata
515 file. The quality setting and so forth are determined by the input file.