Color management encompasses a set of software technologies that seeks to match color across input, display, and output devices by referencing their color behavior to a known standard by means of device profiles.
Color temperature : A measurement of the color of white light, expressed in Kelvins . Computer monitors typically have a color temperature of 5000-9300K: 5000K= yellowish-white, 9300K=blue white. 6500K is recommended
Gamma : describes the reflectance of your prints . Gamma affects middle tones; it has no effect on black or white. Too high gamma = too dark middle tones appear. Too low gamma = too light middle tones. 2.2 is standard gamma for displays today.
Black & white luminance : the amount of light or dark of a defined area
Relative Colorimetric --produces superior results generally.
How it works : first scales the white of the source space to the white of the target space, adjusting all other colors relative to that white. Then it matches the adjusted colors in the source space that are inside the gamut of the target space exactly, and clips out-of-gamut colors to the nearest reproducible hue, sacrificing lightness and saturation.
Perceptual – good for images with significant shadow details where a slight lightening of the print is acceptable to open up the shadows. Also images with areas of highly saturated color can benefit from Perceptual rendering. If you see color banding in the soft proof with relative colorimetric selected, try perceptual.
How it works: attempts to compress the gamut of the source space into the gamut of the destination space -- even though all the colors may change in the process.
You can also change color spaces of image files within CS2.
Choosing a different Profile button dropdown menu assigns the new profile to the image without converting colors to the profile space. This may dramatically change the appearance of the colors as displayed on your monitor.
This is useful when an image is missing its profile or has an incorrect embedded profile
You can also remove a profile by clicking on the Don’t Color Manage This document button.
CS2 & Lightroom use two built-in profiles for each supported model of camera when it interprets image data.
Profiles are produced by photographing a color target under different white-balanced lighting conditions. When you set a white balance, software uses the profiles for your camera to extrapolate color information.
These camera-specific profiles are generic, derived from baseline units.
Your camera may be different from baseline units due to design and firmware changes.
Scanner profiles ensure accurate and consistent color and density captures. Scanning calibration can be done on your scanner using an industry standard reference chart called an IT8 Target.
You scan the target and then use profile creation software to read the data and build a custom profile. After the profile is created, you then assign it to newly scanned images as they are imported into Photoshop. 6