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Author Topic: Blue casts with profiled workflow - Q 4 Experts  (Read 2823 times)
colourperfect
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« on: March 21, 2006, 07:33:25 AM »
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Hi,

I am experiencing a blue cast to images printed using PS CS2 Print with Preview using a Canon i990 (with latest drivers) with 3rd party paper from Jessops ( A UK company) and a custom profile I created.

All the normal nozzle checks etc have been done and I am running a recently calibrated monitor.

The blue cast is also present in PS softproof but only when I turn on simulate paper white. It is present for both Perceptual and Rel Col rendering. Interestingly the cast disappears on the softproof when I select absolute colorimetric, as long as Simulate Paper White is still selected.

If paper white simulation is is unchecked with absolute colorimetric rendering then the image has a yellow cast.

It seems that with PS I can simulate the effects of the blue cast but am unable to do this using Gretag s/w.

There seems to be a disparity between PS implementation of paper white simulation and Gretag Macbeths.

I have asked GMB about this and they blaimed optical brightners in the paper, but offered no further help.

Normal profile editing seems to involve either the LAB to printer direction or the LAB to softproof direction. I seem to need to edit both, which seems indicative of a problem somewhere else.

Anybody any suggestions ?

Thanks

Ian
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digitaldog
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« Reply #1 on: March 21, 2006, 08:29:58 AM »
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-->I have asked GMB about this and they blaimed optical brightners in the paper, but offered no further help.

That's what I suspect. What device did you use to measure the paper?

Make a white patch and convert using this profile. What's the LAB values? If the b* value is a negative value, its another indicator that you have an OB issue.
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Andrew Rodney
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colourperfect
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« Reply #2 on: March 21, 2006, 09:34:38 AM »
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Andrew,

I used an Eye-One pro, rev B.

Can you explain what you mean by Make a white patch ? Do you mean measure the a white section of paper ?

Or do you mean create a white patch in PS and then convert it to the printer profile and use the PS dropper to measure the LAB values ?

If I do have a OB issue, can you suggest any solutions ?

Thanks

Ian

Quote
-->I have asked GMB about this and they blaimed optical brightners in the paper, but offered no further help.

That's what I suspect. What device did you use to measure the paper?

Make a white patch and convert using this profile. What's the LAB values? If the b* value is a negative value, its another indicator that you have an OB issue.
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« Last Edit: March 21, 2006, 09:35:57 AM by colourperfect » Logged
digitaldog
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« Reply #3 on: March 21, 2006, 09:53:28 AM »
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-->I used an Eye-One pro, rev B.

What software? If Eye-One Match, it should have accounted for the OB automatically. I assume this is a non UV Eye-One.

What you can do is measure the paper white using the Eye-One (you can use the free Eye-One Share software) and examine the LAB values.
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Andrew Rodney
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http://digitaldog.net/
colourperfect
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« Reply #4 on: March 21, 2006, 09:54:39 AM »
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I used Eye-one match 3.6, no UV cut filter. Have got the Eye-one share so I shall do some measurements

Ian

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-->I used an Eye-One pro, rev B.

What software? If Eye-One Match, it should have accounted for the OB automatically. I assume this is a non UV Eye-One.

What you can do is measure the paper white using the Eye-One (you can use the free Eye-One Share software) and examine the LAB values.
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« Last Edit: March 21, 2006, 09:55:32 AM by colourperfect » Logged
digitaldog
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« Reply #5 on: March 21, 2006, 10:23:28 AM »
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-->I used Eye-one match 3.6, no UV cut filter. Have got the Eye-one share so I shall do some measurements

That being the case, the OB should have been taken care of.

If you saved the measured data file, send it to me via email and I'll see what ProfileMaker Pro reports and build a new profile. (andrew@digitaldog.net).
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Andrew Rodney
Author “Color Management for Photographers”
http://digitaldog.net/
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