How to achieve colour consistency when using different papers?

Started 7 months ago | Questions thread
E Dinkla
Contributing MemberPosts: 549
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Re: Just a stoopid observation
In reply to ZorSy, 7 months ago

ZorSy wrote:

If printed images looked the same on any paper used, there'd hardly be a reason to use different papers.

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'Everything in photography boils down to what's sharp and what's fuzzy.'
-Gaylord Herron

Wise words, PicOne and may I just add: in that case we would not need something called Colour Management. But, we do.

Printer colour management is all about how target colour will be rendered at 'target media'. There are no two white papers that are exactly the same when it comes to colour response. Even if they were from the same manufacturer, sold under the same name just different weight.

The colour management, simplified, just creates adjustments needed for target colours appear the same on all those medias. The more target patches measured, the more accurate results, simple.

There is some contradiction in your message.

If the goal is the same color on a variety of papers then a Devicelink profile is needed and the common denominator will be the color on the paper with the lowest gamut. That is how a wider gamut inkjet printer/paper can create proof sheets for a lower gamut offset printer/paper.

Normal ICC color management will fit the image's color space perceptually pleasent (Perceptual rendering) within the gamut of each paper but does not deliver equal image color between different papers, the shift can happen over the entire color range. Absolute colormetric rendering will represent the image colorspace better and the colors that fall within the two paper's gamuts will be close, the colors that fall outside each paper's gamut will be clipped differently though. Relative colormetric is a compromise between the two rendering choices. So in normal color management, to either an RGB  or CMYK device, different papers with different gamuts will always deliver different color, with the exception where the image's color space is totally covered by the two or more papers' gamuts + absolute colormetric rendering is used.

To simulate a Devicelink profile and by that represent the smallest gamut paper image on a wider gamut paper you could do a profile to profile conversion in Photoshop first before doing the print with normal color management. RGB-device profiling like most printers discussed here have. Select the same rendering as used for the smallest gamut paper and convert the image from its color space to the smallest gamut printer profile. After that print that image to the widest gamut paper with its own profile + Absolute Colormetric rendering.

Anyway this goes way beyond the simpler measures the thread starter should have taken to get some consistency in printing and even then his glossy paper will look different compared to the matte paper. Not to mention the viewing light influence on papers with optical brightening agents, the more if that viewing light is not equal to the usual D50 profile creation condition.

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Met vriendelijke groet, Ernst
600+ inkjet paper white spectral plots: OBA content etc.
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm

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