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

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michael
2012-12-13 09:24:53 -05:00
parent 8b71bcbac8
commit 29061c944e
1 changed files with 8 additions and 0 deletions
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8
rtengine/iccstore.cc
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@@ -380,6 +380,14 @@ cmsHPROFILE ICCStore::createFromMatrix (const double matrix[3][3], bool gamma, G
// normalize gamma in RT, default (Emil's choice = sRGB) // normalize gamma in RT, default (Emil's choice = sRGB)
pcurve[3] = 0x2390000;//pcurve for gamma sRGB : g:2.4 s=12.92 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 // constructing profile header