Magenta tint with ISO Hi2 on D5100
- affects mainly dark areas
- does not show in a small band at the top of the image
- shows even with no modules activated, for both demosaicking options
See attachment to see what it looks like in lighttable.
Sample RAW file (upload ETA: 08/01/2012 21:50 GMT+1)
#2 Updated by Gaspard Jankowiak about 7 years ago
Small update for the record: (this is rather clunky)
I've been able to track down this to rawspeed giving out weird values in
Basically values are decoded using Huffman magic and then a curve is applied. For ISO 25600 only (works for ISO 12500,
needs confirmation), some values after Huffmann decoding are negative (
pLeft2), resulting in silly values after applying the curve.
Strange enough this happens only after a some kind of reinitialisation of some table (
NikonDecompressor::initTable), which happens at row 116 in my case.
Before this reinit is done, values are all seem fine, which explains the band at the top.
What I don't understand now is why rawstudio doesn't have this issue even though it's based on rawspeed too...
#3 Updated by Gaspard Jankowiak about 7 years ago
Ok, after unpacking the srpm used for rawstudio 2.0.4 on fedora, there's some ceiling/flooring going on,
which is not in the version used by dt (the last one?)... so I think this definitely marks it as a rawstudio bug.
dest[x] = curve[MIN(_max-1, MAX(0,pLeft1))] | (curve[MIN(_max-1, MAX(0,pLeft2))] << 16);
Filed against rawspeed as bug #587
#5 Updated by Pascal de Bruijn about 7 years ago
We've imported the new RawSpeed code:
Please test and report back.