
Originally Posted by
Dave Taylor
Hi Roger,
I was just perusing some of the older posts and came upon your question. I wanted to do just that a while back. Wanted an algorithm comparison between my camera and a Velvia image of the same scene - then just make an action to bring the digital file in line with the Velvia one. I think the problem we're going to have is the fact that there was no variable color space with film. Velvia has a fixed response to color temperature, as did all films. Whereas digital is like the human eye, it picks the brightest highlight in a scene and balances that as a neutral white. So while an algorithm might work very well for a single image or setting (location, steady and unchanging light source like a studio setup), as soon as the color temp changes it would probably rendor the algorithm less accurate in the least, and completely off at the worst. Hope that helps.