RE: <no subject> now PM 5 Gamut Mapping
RE: <no subject> now PM 5 Gamut Mapping
- Subject: RE: <no subject> now PM 5 Gamut Mapping
- From: "HASLER David" <email@hidden>
- Date: Tue, 8 Mar 2005 19:48:23 +0100
- Thread-topic: <no subject> now PM 5 Gamut Mapping
Hello,
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).
Keeping hue has some drawbacks: There are situations where you can find
a colour in your ouput device that has not exactly the right hue, but
about the right saturation. You are forced to drastically reduce the
saturation if you want to find a color of the desired hue. This often
happens with reds, magentas (especially in sRGB) and yellows, and
results in a somewhat flat picture. But for some people hue is just
crucial, so it's good to still have the choice of the mapping in PM5.
Kind Regards, David Hasler
-----Original Message-----
From: email@hidden [mailto:email@hidden]
Sent: mardi, 8. mars 2005 14:13
To: Roger Breton
Cc: Marco Ugolini; ColorSync; HASLER David
Subject: Re: <no subject> now PM 5 Gamut Mapping
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.
- Jon
GrafixGear
8 West Glen Avenue
Ridgewood, NJ 07450
(201) 447-1510
email@hidden
http://www.GrafixGear.Com
On Mar 3, 2005, at 10:18 PM, Roger Breton wrote:
>> David,
>>
>> I own ProfileMaker 5.02, and I still have not been able to sort out
>> exactly in which way the engineers at Gretag Macbeth intended the
>> three available Gamut Mapping choices (Logo Classic, Logo Colorful,
>> and Logo Chroma
>> Plus) to
>> affect the resulting profile.
>> --------------
>> Marco Ugolini
>
> I tend to think that each new gamut mapping method allowed mapping out
> of gamut saturated colors closer and closer to the outer boudary of
> the device gamut, selectively or intelligently desaturating colors
> instead of globally desaturating colors by the same amount, as was
> used to be done in the past.
>
> Regards,
>
> Roger Breton | Laval, Canada | email@hidden
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