expanding output color gamut with extra colors
expanding output color gamut with extra colors
- Subject: expanding output color gamut with extra colors
- From: email@hidden
- Date: Thu, 8 Jan 2004 10:23:10 -0600
Hi,
In recent posts questions were raised about the use of supplemental colors
(orange, green, light cyan, light magenta, red, blue) particularly with
regard to the effect on the color gamut. I would like to understand more
about this.
My comments in this post are probing the practice of addinga small number
of colors to the basic CMYK process color set, as seen in output devices
that use for example 6 or 8 colors. I am not asking about the practice of
substituting entirely different colors for the basic process color set, or
supplementing them with Pantone or other solid colors.
Apparently there are two different reasons why supplemental colors would be
added to the basic process color set.
First - to expand the color gamut (example - to output more colors that
match a larger range of Pantone or other solids).
Second - to overcome deficiencies with current systems (example - with
inkjet if the drop size is not small enough then the standard color dots
used in light tones are too noticible - therefore the use of lighter inks).
Does this fairly summarize the reasons for the use of supplemental colors -
or are there other reasons also. If there are other reasons, what are
they?
If one has a legacy image file in a smaller color space (for example CMYK)
it's understandable that further conversions of the file may never take
full advantage of a larger color gamut. I think of this as a situation
similar to a legacy file that has already been heavily compressed by a
lossy form of compression - the damage is done and saving in a lossless
compression format at some future point won't undo the damage.
But if one were to create an image from scratch in a large gamut working
space - and from that space could convert to an output space larger than
CMYK - for example CMYKOG - would the preferred starting point be a Lab
space, an RGB space, or something else?
Thanks in advance for your comments.
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