ryan/mozjpeg
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

"integer forward DCT", not "forward integer DCT"

Browse Source 
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.1.x@382 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2011-02-18 03:21:06 +00:00
parent 7c1df0a430
commit f0a5ba7542
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
README-turbo.txt
View File

@@ -59,14 +59,14 @@ consumer packages, such as PhotoShop, use restart markers when generating JPEG
images, so images generated by those programs will experience this issue. images, so images generated by those programs will experience this issue.
=============================================== ===============================================
Fast Forward Integer DCT at High Quality Levels Fast Integer Forward DCT at High Quality Levels
=============================================== ===============================================
The algorithm used by the SIMD-accelerated quantization function cannot produce The algorithm used by the SIMD-accelerated quantization function cannot produce
correct results whenever the fast forward integer DCT is used along with a JPEG correct results whenever the fast integer forward DCT is used along with a JPEG
quality of 98-100. Thus, libjpeg-turbo must use the non-SIMD quantization quality of 98-100. Thus, libjpeg-turbo must use the non-SIMD quantization
function in those cases. This causes performance to drop by as much as 40%. function in those cases. This causes performance to drop by as much as 40%.
It is therefore strongly advised that you use the slow forward integer DCT It is therefore strongly advised that you use the slow integer forward DCT
whenever encoding images with a JPEG quality of 98 or higher. whenever encoding images with a JPEG quality of 98 or higher.