Re: Profilemaker 5.0.5b Gamut mapping
Re: Profilemaker 5.0.5b Gamut mapping
- Subject: Re: Profilemaker 5.0.5b Gamut mapping
- From: Marco Ugolini <email@hidden>
- Date: Fri, 23 Dec 2005 00:05:51 -0800
In a message dated 12/22/05 9:56 PM, Hans Hengeveld wrote:
> I have installed the new update from profilemaker 5.0.5b and like to
> make new custom ISO12647-2 profiles,
> Wich gamut mapping is the best to use?
Personally, I have been using Chroma Plus lately, with good results. But
that was before PM 5.0.5b: I don't know yet whether things are different
now, since the Gamut Mapping engine has apparently been revamped in this
latest upgrade.
But here is more: This from the ProfileMaker 5.0.5b help file:
******
Gamut Mapping Variants
In version 4.0 of ProfileMaker, you can choose between two Gamut Mapping
variants for perceptual and colorimetric rendering intents.
* The LOGO Colorful Gamut Mapping Method is notable for maximum color
saturations and particularly clean primary colors.
* The LOGO Classic variant incorporates the Gamut Mapping method that was
used in ProfileMaker version 3.x, and which placed heavy emphasis on
lightness reproduction and thus on preserving detail reproduction in the
entire color space.
* The focus of emphasis in the LOGO Chroma Plus variant is on higher chroma
in color reproduction, while keeping detail losses to a minimum.
These Gamut Mapping variants are reflected in all four Rendering Intents.
But they are most noticeable in the perceptual (photographic) and saturation
Rendering Intents.
*********
Also, the following was what Jon Meyer wrote to the ColorSync forum on March
8, 2005, 5:13AM:
*********
I believe that a simple answer to the PM 5 Gamut Mapping might be:
1) Classic bases the max primaries off of a linearized balance, thus
reducing potential saturation of a heavy primary.
2) Chroma Plus was introduced to help hit a better saturated green
(c+y), which might be native to both ink jet and photo printers not
using ICC
3) Colorful was added when the Chroma Plus seemed a bit extreme for
pastels, skin tones and a few other memory colors.
*********
David Hasler wrote this on March 8, 2005, 10:48AM:
*********
Here is a rule of thumb of how I would apply the various gamut mappings
in PM5, for the perceptual intent:
- If you just want the most pleasing output, pick COLORFUL
- If you care about hue, for example if you don't want your satured
yellowish red to turn into a bluish red, or your saturated greenish
yellow to turn into a reddish yellow, then pick either CHROMAPLUS or
CLASSIC
- if your output gamut is small (newspaper prints) or just unusual,
pick CLASSIC
- otherwise pick CHROMAPLUS.
I did not use much the relCol intent for printing. As far as I am
concerned, I would pick CLASSIC for small gamuts and CHROMAPLUS/COLORFUL
for bigger gamuts (I think that the relCol intent in COLORFUL and
CHROMAPLUS are identical, at least they were in v5.0, I did not check in
v5.02).
*********
Best regards
--------------
Marco Ugolini
Mill Valley, CA
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