Legacy ImageMagick Discussions Archive

Hey, that txt: option is nice. It shows that the color values really are the same inside the file. So now I'm thinking I've been thrown off by IMDisplay 6.8.8-1 all this time. It must be doing an extra gamma conversion on the dpx that it doesn't do on the png. Running on a Win 8.1 desktop.

OK, here in more detail are my (still bad) results using convert release, 6.8.9-1 My .png is definitely in sRGB space according to identify. It contains a color ramp from 0-255; pixel (128,1) has value 128. The first 5 pixel color values are 0, 1, 2, 3, 4. convert foo.png foo.dpx causes an sRGB ...

I'm on 6.5.4-7 2012-04-10 Q16 OpenMP - so maybe I should upgrade. Thanks

I'm not trying to create a linear DPX, I'm just trying to preserve the colors in the original PNG. Without any arguments, it seems to assume the PNG colors are in linear RGB space and thus applies a log function to them. I'm trying to prevent this from happening.

I'm trying to convert a PNG to DPX without applying a log function. I can ALMOST get the right results using convert -colorspace sRGB colorramp.png colorramp.dpx which says the source is already in log space, but not quite, because the sRGB curve isn't a perfect log curve. So how do I convert ...