At 08:27 7-7-2005 Guenter Bestmann wrote:
Black generation with length and width:
In normal color composition, black begins in the midtones (starting point
of black length) and increases slowly towards shadow. The effective range
of black in chroma varies (black width).
"Black length"
You define the starting point for black (relative to cyan) with the "Black
length" slider: from a very short black (skeleton black) to a long black
(full range).
(snip)
"Black width"
You define the effective range of black with the "Black width" slider:
from a narrow black ("Only in gray") to a wide black ("Full extent").
The
effective range also depends on the setting for black length.
- Wide black: Black goes way into the chroma range if the slider is in
position "10" (maximum setting).
An optimal black is calculated by PrintOpen on the basis of the settings
for "Black length" and "Black
width" and the information taken from the color data.
The information on the
Black "construction" in ICC profiles is, in my
opinion, very important.
I would welcome a standardized way of expressing these values. Sometimes
Black is described in L values, and in this case described in cyan
percentages. Are these settings part of the ISO standard for ICC profiles?
Regards, Henk