Digital Light & Color

When a RAW file is opened in RAW dialog, clicking OK/Apply will create a sidecar-workflow file, which stores all the RAW developing parameters. This is great, since it makes the RAW developing parameters reproducible (i.e. one can develop a system, keep all the RAW files as Masters and process them ...

The steps that you see being applied to a RAW file when you press OK/Apply are necessary to 'develop' a RAW into an image that you can see. You may make adjustments to some of those steps (e.g. white point) or add some extras (e.g. noise reduction). When you load a RAW file into the RAW dialog, a mi...

Could anyone point me out to the actual data of black/white reflectivities of typical photographic papers (or their densities Dmax/Dmin)? Cheers.

Is it the presence of proper LUTs in the source, the target, or in both profiles that enables the use of a rendering intent different from relative colorimetric?

Would it also mean that Preferences/Monitor rendering intent is irrelevant?

Many thanks! As I'm reading the references, I wonder if someone could offer a three-sentences-or-less, layman, physiological/psychological explanation as to why pre-lighting prints (forget colour shifts) to be viewed in environments dimmer than daylight ambient light (but not that overly dim, with n...

But getting the gamma right, how do I start knowing the numerical value of the target illumination level at the gallery? Is there an approximate model that would relate the decrease in illumination with what the pre-lighting gamma should be to compensate for it? Cheers.

Here is another writeup stating that matrix-based colour spaces (such as sRGB or AdobeRGB) can only be mapped to one another using relative colorimetric intent - choosing perceptual defaults to relative colorimetric anyway. Is that true? That would have explained, I think, why (255,0,0) translates t...

This may seem like an obtuse problem, but it's a real life issue. Monitor Curves are great if you could compare a test print with a monitor at the location where the print is to be displayed and then 'pre-correct' it. But what if one can't physically go to the display location, but the illumination ...

Here is a blurb supporting what Elie just said:

http://www.earthboundlight.com/phototip ... ptual.html

David and Elie, Many thanks! I think I almost understand it now with perceptual and colorimatric intents. But what happens when a saturated colour (such as pure saturated red (1 0 0)) is mapped from a smaller gamut sRGB to a larger gamut AdobeRGB using 'Preserve Saturation' rendering intent? I thoug...