Francisco Cribari <[email protected]> writes: > After I calibrated my monitor I noticed that my B&W photos had a > slight brownish tint.
In addition to what others already said ... You shouldn't take your monitor calibration as an 100%-correct absolute reference. First, no colorimeter is perfect. I had to send my ColorHug back for a refund because it was producing an unusably red display for me (I mean, unusable not just for image processing, really, really read). It works fine for other people. Then, one difficulty is to decide what "white" means. For a sheet of paper, "white" means "reflects all colors equally". Actually, this means that a white paper is as white as the light it receives, but the same paper have totaly different color inside with artificial lighting and outside for example. But your eyes have automatic white-balance and see the paper as more or less the same color anyway. For a screen, it's different because the screen emits its own light, so "reflects all colors equally" means nothing. It's tempting to think that white means "same amount of light for every color", but then you have to define what "same amount of light" means (same number of photons, same power, with our without taking into account the eye's sensitivity which is not the same for all colors). So, you (and your calibration system) have to decide arbitrarily what "white" means. Usually, people take 6500K which means "same color as black body at temperature 6500k" (modulo some more complicated details I never understood ^^). Anything considered "black and white" (or more generally neutral grey) by your computer will displayed as close as possible to this arbitrary color. I have a monitor in front of a white wall. The white of the wall is the one of my room's lighting (artificial or sunlight depending on the time), and the white of my monitor is the one of my computer. One white is rarely the same as the other. So, if you're not happy with how neutral greys are displayed by your computer, then you should not change the colors, but the way they are rendered (calibration hardware or parameters), or the way you see them (e.g. the lighting in your computer's room can influence your eye's "auto white balance" and change your subjective perception of colors). -- Matthieu Moy http://www-verimag.imag.fr/~moy/ ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
