hi, i just tried to load christian's sample using the GM code path. it looks very much the same and somehow broken as with the usual tiff code path. it does however contain negative values in all three channels.. which for the a,b part is a good thing.
if i open the file in "display" (imagemagick) it shows just fine (where "just fine" means it looks like it's displaying Lab as RGB data, but at least not overly solarised). i don't think anything between loading and colorin (where i looked at the values) should be changing the pixel values.. so i'm thinking the decoding must be broken/doing something wrong. cheers, jo On Wed, Jan 9, 2019 at 7:00 PM Ulrich Pegelow <ulrich.pege...@tongareva.de> wrote: > > Am 09.01.19 um 15:43 schrieb Michael Below: > > Hi, > > I remember similar issues some years ago, iirc only imagemagick was able to > > process similar tiff images correctly. I think most other programs were > > using a certain library (gtk?) that caused these issues. > > Good luck! > > Any knowledge if GraphcisMagick is able to read these files correctly? > > Background of my question: darktable has two(*) places where it would > read tiff files. The first one is it's internal routine in > common/imageio_tiff.c. If this fails (and the file does not get > processed by rawspeed) we give it a last try with GraphicsMagick. > > I am quite sure that our imageio_tiff is not able to handle the > Heidelberg files correctly (and we will probably not have the capacity > to change that). However, it might be more easy to properly detect them > as not processable, fail at that step and thereby delegating it to > GraphicsMagick. > > Ulrich > > (*) Well, in fact three places, as many raw files are also tiff files > internally which implies that rawspeed might also try to read the files > in question and fail. That's t.b.c. > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
