JPG sub sampling setting

Question

Originally reported on Google Code with ID 1502

Discussion continued from here:
http://www.rawtherapee.com/forum/viewtopic.php?t=4155&p=29478

Currently RT uses the JPG library default setting, which is optimized for high compression/low
quality (4:1:1). This patch allows to set the sub sampling in three levels (best quality/best
compression/balanced).
The JPG defaults for new users are changed to 90%/Balanced, which should fit the average
user without creating overly huge files.

Tested with the current 8d version of the JPG library (january 2012).

General info about JPG sub sampling can be found here:
http://en.wikipedia.org/wiki/Chroma_subsampling

Reported by oduis.com on 2012-07-20 12:18:50

• Attachment: jpegsettings.patch

该提问来源于开源项目：Beep6581/RawTherapee

Answer 1

Thanks, Olli, works great! I tested with JPG library from your distribution of RT dependencies.
For each subsampling value opened images in Photoshop and Fastpictureviewer without
issues.
May be add a tooltip to display the meaning of each subsampling value?

Reported by michaelezra000 on 2012-07-20 13:08:37