liz/rawTherapee
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix for precision loss in opening 16 bit TIFF files (on behalf of Torger see issue 1642)

Browse Source
This commit is contained in:
michael
2012-12-13 09:24:53 -05:00
parent 8b71bcbac8
commit 29061c944e
1 changed files with 8 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
rtengine/iccstore.cc
View File

@@ -380,6 +380,14 @@ cmsHPROFILE ICCStore::createFromMatrix (const double matrix[3][3], bool gamma, G
// normalize gamma in RT, default (Emil's choice = sRGB)
pcurve[3] = 0x2390000;//pcurve for gamma sRGB : g:2.4 s=12.92
} else {
// lcms2 up to 2.4 has a bug with linear gamma causing precision loss (banding)
// of floating point data when a normal icc encoding of linear gamma is used
// (i e 0 table entries), but by encoding a gamma curve which is 1.0 the
// floating point path is taken within lcms2 so no precision loss occurs and
// gamma is still 1.0.
pcurve[2] = 1;
pcurve[3] = 0x1000000; //pcurve for gamma 1
}
// constructing profile header