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Color Space Conversion but out of gamut color shift

Geo Lam , Dec 26, 2010; 08:36 a.m.

Dear All,
I am editing in ProPhoto colorspace and when preparing file to print in Fuji Frontier 570, I try to convert the color space from ProPhoto to sRGB. However, even I am using "Perceptual" in the conversion, the color still shift a lot. How can I remediate this?

Responses


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Howard M , Dec 26, 2010; 09:13 a.m.

you might want to try some selective desaturation and/or exposure change to pull those colors back into sRGB gamut.

William Kahn , Dec 26, 2010; 09:28 a.m.

test

William Kahn , Dec 26, 2010; 09:44 a.m.

Try converting to Adobe RGB instead of sRGB, and use "Relative Colorimetric" instead of "Perceptual" for rendering intent. If you're using your editor's color management, turn your printer's colormanagement routines.

Disregard the "test" post...

Andrew Rodney , Dec 26, 2010; 10:26 a.m.

There should not be a color shift with a well built profile, in fact, converting from Adobe RGB (1998) or even sRGB to the output profile should produce very, very similar color appearance (you may want to try this). Are you seeing blues shifting magenta? As William said, try RelCol too (even Saturation). Where did this profile come from?

Tim Lookingbill , Dec 26, 2010; 11:56 a.m.

I try to convert the color space from ProPhoto to sRGB...

even I am using "Perceptual" in the conversion, the color still shift a lot.

There's no "perceptual" table in the matrix based sRGB color space unless you're converting using a table based Fuji Frontier custom profile which you have not indicated.

You've missed something in describing what you are doing.

Andrew Rodney , Dec 26, 2010; 12:04 p.m.

There's no "perceptual" table in the matrix based sRGB color space unless you're converting using a table based Fuji Frontier custom profile which you have not indicated.

That’s exactly how you get a Perceptual rendering (from the output profile, not the source profile).All output (printer) profiles should have all 3 tables. By the time the output profile comes into the scene, its getting Lab from the PCS (from sRGB). If you conduct a matrix to matrix profile conversion, again, the secondary profile is being fed Lab, but it only has a colorimetric table, in which case what you wrote above would be true.

The question now is, what kinds of shifting are being seen going from ProPhoto (or sRGB) to the Fuji output color space and why the Fuji is causing this shifting.

Francisco Disilvestro , Dec 26, 2010; 12:26 p.m.

I try to convert the color space from ProPhoto to sRGB

The OP is converting from ProPhoto to sRGB, not to a Fuji Output color space. As Tim pointed out, there is no perceptual conversion to a matrix color space, at least in Version 2 ICC profiles.

However, I agree that you should not see color shifts. What should happen is that some colors get saturated or blow out, due to the smaller sRGB color space (unless this effect in the saturated colors is perceived as a color shift)

Besides reducing saturation or, even better, reduce vibrance before converting to sRGB, another option is to use a version 4 sRGB, which do allow for perceptual conversion. You can find the profile here

Andrew Rodney , Dec 26, 2010; 12:33 p.m.

The way I read the OP’s question is he’s getting a shift form ProPhoto to Fuji. There’s no way a ProPhoto to sRGB conversion would produce a true color shift (I’ve never, ever seen this).

Francisco Disilvestro , Dec 26, 2010; 12:46 p.m.

A neutral or gray tone will not shift when converting from Prophoto to sRGB, but if you have a wide gamut monitor and an image in Prophoto with a large area with colors outside the gamut of sRGB, you may perceive a color shift when converting to sRGB, since that large area will have a less saturated color (it would be the most saturated available in the new color space)


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