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| author | dcommander <dcommander@3789f03b-4d11-0410-bbf8-ca57d06f2519> | 2011-02-18 02:41:03 +0000 |
|---|---|---|
| committer | dcommander <dcommander@3789f03b-4d11-0410-bbf8-ca57d06f2519> | 2011-02-18 02:41:03 +0000 |
| commit | 5d0095611dcfb44e76ab0cd092bcbafc007754c8 (patch) | |
| tree | 5923831f21e3051bcd6af33fd971b2c0d990a0ee /branches | |
| parent | eb7386fae2439fdbcf052039751ecb78c3987520 (diff) | |
git-svn-id: https://libjpeg-turbo.svn.sourceforge.net/svnroot/libjpeg-turbo@379 3789f03b-4d11-0410-bbf8-ca57d06f2519
Diffstat (limited to 'branches')
| -rw-r--r-- | branches/1.1.x/ChangeLog.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/branches/1.1.x/ChangeLog.txt b/branches/1.1.x/ChangeLog.txt index 14d251a..100eddd 100644 --- a/branches/1.1.x/ChangeLog.txt +++ b/branches/1.1.x/ChangeLog.txt @@ -3,13 +3,17 @@ [1] The algorithm used by the SIMD quantization function cannot produce correct results when the JPEG quality is >= 98 and the fast integer forward DCT is -used. Thus, the non-SIMD quantization function is now used for those cases. +used. Thus, the non-SIMD quantization function is now used for those cases, +and libjpeg-turbo should now produce identical output to libjpeg v6b in all +cases. [2] Despite the above, the fast integer forward DCT still degrades somewhat for JPEG qualities greater than 95, so TurboJPEG/OSS will now automatically use the slow integer forward DCT when generating JPEG images of quality 96 or greater. This reduces compression performance by as much as 15% for these high-quality images but is necessary to ensure that the images are perceptually lossless. +It also ensures that the library can avoid the performance pitfall created by +[1]. [3] Ported jpgtest.cxx to pure C to avoid the need for a C++ compiler. |