[HOWTO] some color questions
[HOWTO] some color questions
- Subject: [HOWTO] some color questions
- From: Lists <email@hidden>
- Date: Thu, 03 Jul 2003 11:34:08 +0200
>
> - First, when I set the color setting (profiles) in Photoshop 6.0 the same
>
> as the CMYK and RGB settings in photoshop 5.5, the result is not the same.
>
> Photshop 6.0 is always too saturated (I think only the black, not 100%
>
sure
>
> of it). Am I doing something wrong?
>
>
>
> RGB -> Adobe RGB (1998)
>
> CMYK -> Our press profile
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> Color Engine -> Colorsync
>
>
Adobe ACE would be better.
I've tried but it does not change very much. It isn't even better.
>
> Rendering Intent -> Relative
>
>
>
> - Second is that when I change the rendering intent in Photoshop 6.0 (with
>
> preview enabled), the view does not change. It stays the same.
>
> Normally, there should be a 'big' difference between relative intent, and
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> saturation or perceptual?
>
>
Nope. Until I know, RI will be used only in conversions RBG > RGB.... RGB >
>
CMYK..etc.
>
If you try to convert from RGB to CMYK, would be file specific dependent,
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probably will see the diference.
Yes, but when you change the RI in Photoshop 5.5 (CMYK Settings), that
change very much.
Why is this changed then in the 6.0?
>
>
> - Third problem is that I always have a reddish tint when I calibrate my
>
> screen. It's a Lacie monitor, and I measure and profile it with the gretag
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> software + Spectrolino.
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> eg, after profiling, I look at the neutral gray background on the screen
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and
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> it's a little reddish. The images also does not match our prints, there is
>
a
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> little difference in the blue and red dark colors. We are using Epson 5000
>
> and BestRIP for proofing,
>
> Can I make a correction into the monitor profile? I've tried with Profile
>
> Editor but this does not work (the results are not good).
>
>
For sure have something wrong in your profiling process, procedure or
>
colorimeter.
>
To edit a monitor profile isn't the better choice, or evem Not a choice some
>
people would to say.
>
You need to recheck every profile process to figure out.
>
More information will be needed.
So I use Profilemaker 3.1.4 to calibrate the screen, and I use following
workflow:
- Reset screen (hardware)
- In Colorsync, place all RGB Profiles on ADOBE RGB (1998) and restart.
- Start Measure Tool, place screen on MAX contrast, and minimum Brightness.
- Start measuring, Contrast is OK at 100%
- Brightness is set on 30%, to get the green triangle.
- Separate colorchannels (RGB) -> R=%, G=% and B=%
- Then colors are displayed, and are place in the video card.
- Save the measured file.
- start ProfileMaker, select measured file, and start to make profile.
- Place this into System Folder-> Colorsync Profiles, and set this new RGB
profile in Colorsync
- Restart
>
> - Last question, we received RGB images (without any camera profile
>
> included), and need to print these. Is there a good way to convert these
>
> images to CMYK? Are there some rules?
>
> I normally go in photoshop to Mode -> profile to profile and then:
>
>
>
> FROM: ADOBE RGB (1998)
>
> TO: Our Press Profile
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> Rendering Intent: Perceptual
>
>
A very general guide (not for every situation), would be to (if your monitor
>
are correctly profiled) pick many RGB profiles and try to assign (a quikly
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prevew is offer in assign profile PS window) for the current image. When you
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find a "natural" look or some more pleasent color, just assign and convert
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to your output (your CMYK profile for example).
>
I'm sure that many others will give to you more valuable help.
Okay, thanks forthis info!
>
>
Best regards,
Best regards, and again thanks for the help.
Bart Mulier
Belgium
>
Adriano Von Markendorf | Rio de Janeiro - Brasil |
>
email@hidden
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