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- ColorSync: RAM and Disk Space Used, Color Matching Speed
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- Article Created: 6 January 1993
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- TOPIC -----------------------------------------------------------
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- How fast and efficient is the ColorSync Color Matching Method (CMM)?
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- DISCUSSION ------------------------------------------------------
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- The goal for the default CMM was minimal size. The default CMM uses
- approximately 70K of RAM and disk space. Profiles are also small, taking
- less than 5K of disk space each.
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- The default CMM converts approximately 4K color pixels/second on a
- Macintosh IIci computer. This means that a 24-bit scan of a 3x5 image at
- 100 dpi takes about 40 seconds.
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- Other methods (Kodak's ColorSense and EFI's EFIColor) can use the Component
- Manager to provide excellent matching and good performance. But the
- ColorSync default CMM was designed to have a small memory footprint for
- mainstream users. The other matching methods are table-driven and become
- quite large to perform all of the functions such as preview, gamut
- checking, and perceptual, colorimetric, or saturation matching. Lookup
- tables are very fast, but require large amounts of memory for the
- separate tables for every device combination.
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- Copyright 1993, Apple Computer, Inc.
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