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Issue 9232002: Update libjpeg-turbo to 1.2. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/libjpeg_turbo/
Patch Set: '' Created 8 years, 11 months ago
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1 libjpeg-turbo note: This file is mostly taken from the libjpeg v8b README 1 libjpeg-turbo note: This file is mostly taken from the libjpeg v8b README
2 file, and it is included only for reference. Some parts of it may not apply to 2 file, and it is included only for reference. Some parts of it may not apply to
3 libjpeg-turbo. Please see README-turbo.txt for information specific to the 3 libjpeg-turbo. Please see README-turbo.txt for information specific to the
4 turbo version. 4 turbo version.
5 5
6 6
7 The Independent JPEG Group's JPEG software 7 The Independent JPEG Group's JPEG software
8 ========================================== 8 ==========================================
9 9
10 This distribution contains a release of the Independent JPEG Group's free JPEG 10 This distribution contains a release of the Independent JPEG Group's free JPEG
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55 more of the REFERENCES, then looking at the documentation files (in roughly 55 more of the REFERENCES, then looking at the documentation files (in roughly
56 the order listed) before diving into the code. 56 the order listed) before diving into the code.
57 57
58 58
59 OVERVIEW 59 OVERVIEW
60 ======== 60 ========
61 61
62 This package contains C software to implement JPEG image encoding, decoding, 62 This package contains C software to implement JPEG image encoding, decoding,
63 and transcoding. JPEG (pronounced "jay-peg") is a standardized compression 63 and transcoding. JPEG (pronounced "jay-peg") is a standardized compression
64 method for full-color and gray-scale images. JPEG's strong suit is compressing 64 method for full-color and gray-scale images. JPEG's strong suit is compressing
65 photographic images or other types of images which have smooth color and 65 photographic images or other types of images that have smooth color and
66 brightness transitions between neighboring pixels. Images with sharp lines or 66 brightness transitions between neighboring pixels. Images with sharp lines or
67 other abrupt features may not compress well with JPEG, and a higher JPEG 67 other abrupt features may not compress well with JPEG, and a higher JPEG
68 quality may have to be used to avoid visible compression artifacts with such 68 quality may have to be used to avoid visible compression artifacts with such
69 images. 69 images.
70 70
71 JPEG is lossy, meaning that the output pixels are not necessarily identical to 71 JPEG is lossy, meaning that the output pixels are not necessarily identical to
72 the input pixels. However, on photographic content and other "smooth" images, 72 the input pixels. However, on photographic content and other "smooth" images,
73 very good compression ratios can be obtained with no visible compression 73 very good compression ratios can be obtained with no visible compression
74 artifacts, and extremely high compression ratios are possible if you are 74 artifacts, and extremely high compression ratios are possible if you are
75 willing to sacrifice image quality (by reducing the "quality" setting in the 75 willing to sacrifice image quality (by reducing the "quality" setting in the
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267 If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu 267 If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu
268 with body 268 with body
269 send usenet/news.answers/jpeg-faq/part1 269 send usenet/news.answers/jpeg-faq/part1
270 send usenet/news.answers/jpeg-faq/part2 270 send usenet/news.answers/jpeg-faq/part2
271 271
272 272
273 FILE FORMAT WARS 273 FILE FORMAT WARS
274 ================ 274 ================
275 275
276 The ISO JPEG standards committee actually promotes different formats like 276 The ISO JPEG standards committee actually promotes different formats like
277 "JPEG 2000" or "JPEG XR" which are incompatible with original DCT-based 277 "JPEG 2000" or "JPEG XR", which are incompatible with original DCT-based
278 JPEG. IJG therefore does not support these formats (see REFERENCES). Indeed, 278 JPEG. IJG therefore does not support these formats (see REFERENCES). Indeed,
279 one of the original reasons for developing this free software was to help 279 one of the original reasons for developing this free software was to help
280 force convergence on common, interoperable format standards for JPEG files. 280 force convergence on common, interoperable format standards for JPEG files.
281 Don't use an incompatible file format! 281 Don't use an incompatible file format!
282 (In any case, our decoder will remain capable of reading existing JPEG 282 (In any case, our decoder will remain capable of reading existing JPEG
283 image files indefinitely.) 283 image files indefinitely.)
284 284
285 285
286 TO DO 286 TO DO
287 ===== 287 =====
288 288
289 Please send bug reports, offers of help, etc. to jpeg-info@uc.ag. 289 Please send bug reports, offers of help, etc. to jpeg-info@uc.ag.
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