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Author Topic: Color Mapping  (Read 3326 times)

alajuela

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Color Mapping
« on: February 21, 2011, 11:31:14 PM »

Good morning
I would like an affordable software that will allow me to see how my photos map in different color spaces, To see if they are out of gamut
Thanks for your help
Alajuela
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Mark D Segal

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Re: Color Mapping
« Reply #1 on: February 21, 2011, 11:36:11 PM »

Good morning
I would like an affordable software that will allow me to see how my photos map in different color spaces, To see if they are out of gamut
Thanks for your help
Alajuela

Do you use Photoshop? If you do, there is a gamut warning tool in the View menu.
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Mark D Segal (formerly MarkDS)
Author: "Scanning Workflows with SilverFast 8....." http://www.luminous-landscape.com/reviews/film/scanning_workflows_with_silverfast_8.shtml

alajuela

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Re: Color Mapping
« Reply #2 on: February 21, 2011, 11:39:22 PM »

Hi
I do use PS, but I dont want a warning, I would like to see where my image lies in the colorspace.
Thanks
Alajuela
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K.C.

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Re: Color Mapping
« Reply #3 on: February 22, 2011, 12:32:13 AM »

What color spaces are looking for that aren't available in PS ?
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ErikKaffehr

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Re: Color Mapping
« Reply #4 on: February 22, 2011, 12:35:14 AM »

Hi,

I think that ColorThink2 may do what you have on mind.

Best regards
Erik

Hi
I do use PS, but I dont want a warning, I would like to see where my image lies in the colorspace.
Thanks
Alajuela

alajuela

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Re: Color Mapping
« Reply #5 on: February 22, 2011, 12:43:51 AM »

Thank you Erik
This is what I have in mind, this will give me a visual of what the photo looks like in the color space.
Thanks so much
Alajuela
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ErikKaffehr

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Re: Color Mapping
« Reply #6 on: February 22, 2011, 01:17:14 AM »

Hi,

User interface may be a bit odd. I enclose a screendump with some samples:

Autumn foliage in Prophoto RGB (dots)
Adobe RGB
My printer profile Epson SP3800, Ilford Gallery Smooth Gloss

BR
Erik

Thank you Erik
This is what I have in mind, this will give me a visual of what the photo looks like in the color space.
Thanks so much
Alajuela

tho_mas

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Re: Color Mapping
« Reply #7 on: February 23, 2011, 04:32:00 AM »

Autumn foliage in Prophoto RGB (dots)
Adobe RGB
My printer profile Epson SP3800, Ilford Gallery Smooth Gloss
the issue here is it's absolute colormetric... AdobeRGB is displayed in D65 whereas the image and printer profile are displayed in D50.
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ErikKaffehr

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Re: Color Mapping
« Reply #8 on: February 23, 2011, 05:47:22 AM »

Hi,

The idea was just to demonstrate what the information looks like.

And yes I noticed the difference in white point. Is that a property of the color space?

Best regards
Erik

the issue here is it's absolute colormetric... AdobeRGB is displayed in D65 whereas the image and printer profile are displayed in D50.

tho_mas

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Re: Color Mapping
« Reply #9 on: February 23, 2011, 01:31:17 PM »

The idea was just to demonstrate what the information looks like.
makes sense

Quote
And yes I noticed the difference in white point. Is that a property of the color space?
yes, it is (see attachment).
Color Thinks Grapher displays everything in relation to D50  (i.e. the L*-axis referrs to D50). In the Pro version you can cange the rendering intend... but in the standard version you can't.
« Last Edit: February 23, 2011, 01:34:25 PM by tho_mas »
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FranciscoDisilvestro

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Re: Color Mapping
« Reply #10 on: February 23, 2011, 04:03:55 PM »

Another option are some of the tools available in the open source Argyll CMS. The drawback is that the interface is command line based.

iccgamut - Generate a plot of a ICC profile
tiffgamut - Generate a plot of the color space from a TIFF file
viewgam - To view the gamut plots

There is the option to use different rendering intents

To view the 3D graphs you need a plugin for your browser like the Cortona 3D viewer (It's free for personal or non commercial use)

FranciscoDisilvestro

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Re: Color Mapping
« Reply #11 on: February 23, 2011, 09:53:06 PM »

Following are some examples of gamut volumes using the tools from Argyll CMS and the Cortona 3D Viewer


The first two images show the gamut volume of a test image against AdobeRGB (first) and then against sRGB (second). In this case, some colors would clip using sRGB.


The third plot shows a second test image against ProPhotoRGB. In this case there is really no need to use ProPhotoRGB. Just a small fraction of the space is used


Note: Solid for image gamut, wireframe for workspace gamut. The Cortona 3D Viewer allows rotation of the 3D volumes


digitaldog

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Re: Color Mapping
« Reply #12 on: February 25, 2011, 01:05:25 PM »

I find ColorThink Pro indispensable for this task, not only for plotting 3D gamuts of color spaces, but for color lists as well. Also for plotting vectors between two 3D lists. A color list can be generated from any two identical sets of patches that end up producing Lab values. So you can convert a test chart using two different methods and plot in 3D the delta’s with vectors. Super useful.
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Andrew Rodney
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