Using Camera RAW in Photoshop CS
as Your Digital Darkroom, page 6
Color Space
The Space drop-down list is used to set the color space. The color space is the range of the color
spectrum (also called gamut) in which a device such as a monitor or digital camera works.
There are four options to choose from in the Space drop-down list:
- Adobe RGB (1998): This color space offers the widest range of colors. It is a
good choice for high quality digital photographs. This is the color space I usually select.
- ColorMatch RGB: This color space is used by many publishers and commercial printers.
If you are creating photos for offset printing, check with your printer to see if this color
space is the one to use.
- ProPhoto RGB: This color space was created by Kodak for their high-end professional
digital cameras. It offers a wider range of colors, but should only be used with Kodak cameras.
- sRGB IEC61966-1: Also called sRGB for short (for standard RGB), this color space
offers a smaller range of colors and is a good choice for Web graphics.
Depth
The Depth drop-down list offers two bit-depth options: 8 Bits/Channel and 16 Bits/Channel. The
bit-depth is the amount of color information in a pixel per channel. The more bit-depth that an image has,
the more colors are available. So, the higher the bit-depth, the more accurate the color representation is
on the screen and the printed page.
Some typical bit-depth values are 1-bit, 8-bit, and 16-bit. For example, a 1-bit pixel has two possible
color values, black and white. An 8-bit pixel has 256 possible color values, and a 16-bit pixel has 65,536
possible color values.
Since Photoshop CS now has the ability to work with 16-bit color images (Photoshop 7 did not), it’s up to
you to choose the bit-depth you want to use. The only word of caution is that when you select a greater bit-depth
invariably file size goes up.
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