September 1, 2008
This plug-in allows you to add tints to an image for artistic effect. e.g. sepia tone, warm, cool, bleach bypass, etc. It can also convert images to black & white and can emulate the use of color [...]
Filed under: Photoshop, color correction, still photography | Comments (3)
August 24, 2008
One potential issue with some (but not all) RAW processors is that they may apply a saturation algorithm that is prone to making flesh tones appear green.
(click for a larger image)
In the comparison above, the image (the back of my hand) was processed via Adobe Camera RAW and Colormancer (my saturation algorithm). What is [...]
Filed under: Photoshop, color correction, color science | Comments (5)
August 13, 2008
Is there such thing as perfect white balance? Some people worry over getting white balance technically correct. And there are products on the market such as Expodisc that try to do exactly this. In my opinion however, you don’t need to obsess over white balance. Why? Because our perception of color is a guess to [...]
Filed under: color correction, color science, still photography | Comments (6)
July 12, 2008
Another useful technique for black and white photos is to add a slight tint to it like a sepia tone. Photo.net has a good tutorial on doing this. The key idea is to add tints of slightly different colors for more ‘tonality’ to the image as opposed to a tint of a single color.
The feature [...]
Filed under: color correction | Comments (1)
July 12, 2008
When converting color images to black & white, a common technique is to control how each color contributes to the resulting image. This is the same idea as using color filters when shooting a black and white film stock.
In the two images below, the top image uses channel blending to use 70% red and 30% [...]
Filed under: color correction | Comments (0)
June 23, 2008
Color spaces can generally be classified as chromaticity or chrominance based. Both are different styles of defining color. Chromaticity is “color” defined independent of luminance (or the equivalent of luminance in a particular color space). Suppose you used a neutral density filter on a camera or changed the intensity of the lighting. The [...]
Filed under: color correction, color science | Comments (5)
June 23, 2008
For color correction, it might seem sensible to use a perceptually uniform color space. CIE L*a*b* is one such color space that is designed to be perceptually uniform.
In the context of LAB, perceptual uniformity means that the ability to tell two shades apart is uniform. This is usually measured in just [...]
Filed under: color correction, color science | Comments (3)
A blog by Glenn Chan. Check out Free Photoshop Plugins and my commercial color correction Photoshop plugins (Colormancer) for information on my plugins / filters.
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