convert from Adobe RGB to some kind of linear RGB (and back)

[fmw42]

Resampling in linear light gives darker halos. Resampling in a "perceptual space" gives lighter halos. So, pick a perceptual space which, in relation to linear light, is not "kinky", and blend the two results, using more perceptual where dark, and more linear where light. Blending is more accurate when both images are in the same color space. This is why everything is converted to linear light, if not already, just before blending. Linear light is a good friend of blending.

Thanks for the explanation. That makes sense now. Very clever. The best of both worlds!

[snibgo]

It's worth mentioning, if only to eliminate them as suspects:

- ProPhoto, which is gamma 1.8 with a straight-line portion. Boo hiss.
- scRGB which has the same gamma curve as sRGB. Boo hiss.
- Wide-gamut RGB which has the same gamma curve as AdobeRGB. This colorspace might be useful for this non-ringing purpose. See http://en.wikipedia.org/wiki/Wide_Gamut_RGB_color_space

[fmw42]

Where can one download this Wide Gamut RGB profile?

[snibgo]

I've made one from dcraw: WideGamutD65.icc, https://www.dropbox.com/s/498v05l3qghin ... 5.icc?dl=1

[fmw42]

I've made one from dcraw: WideGamutD65.icc, https://www.dropbox.com/s/498v05l3qghin ... 5.icc?dl=1

Thanks.