Photo CD in CIELAB color
CIELAB color is a color space which encompasses RGB, CMYK,
and describes generally the visible spectrum that the human eye
can see. Photoshop software uses the color space as its "native"
space because of its ability to hold within this space each of
the other color gamuts it must manage and display.
CIELAB is an ideal space for images, too, as it can be used to
record color positions from other color spaces, and convert with
relative ease between the various spaces it supports. Photo CD's
YCC space can be mathematically reshaped to CIELAB space. The
CMS Open plug-in for Photoshop is the only software that has
the ability to convert images from the Photo CD disc directly
into CIELAB space. This conversion is compared to other mode
changes - nondestructive. It is a geometric reshaping of the
mathematical values of the YCC file into LAB color space.
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