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Mike Chaney's Tech Corner > Mike's Software > Qimage > color profile caching?
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Author Topic: color profile caching?  (Read 11965 times)
ronzie
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« on: November 22, 2011, 02:35:35 AM »
QImage Pro 2010.210 on Win XP SP3 - 32 bit.

In changing printer profiles under edit/prefs/color management

QImage color manages printer enabled.

Like some photo editors, does Q need to be restarted when changing a printer profile because of profile caching or does it take effect immediately upon selection. The print queue is emptied before I do this and it is not a batch mode question.
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Terry-M
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« Reply #1 on: November 22, 2011, 08:06:34 AM »
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does Q need to be restarted when changing a printer profile because of profile caching or does it take effect immediately upon selection
No re-start required, changes take effect immediately  Smiley

... and Qimage also puts a little tag on the lower left corner of the preview screen to remind you that alternate color management is in use.
Terry
« Last Edit: November 22, 2011, 10:18:39 AM by Fred A » Logged
Terry-M
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« Reply #2 on: November 22, 2011, 10:58:39 AM »
One other point:
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In changing printer profiles under edit/prefs/color management
Did you know that it's possible to have different profiles allocated to individual prints in the queue? See screen shots below.
When using this feature, a little icon appears on the preview to remind you the image has a different printer profile allocated.
The screen shots are for Ultimate but Pro will be similar - as far as remember it does have this feature  Wink
Terry
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Fred A
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« Reply #3 on: November 22, 2011, 12:18:27 PM »
and to embellish a little on Terry's post, you can put (for example) 2- 5 x 7 prints on the same piece of 8.5 x 11 paper and apply a different printer profile to each one.
Let's say, you made a printer profile using Profile Prism. You want to make a side by side comparison print with one using the Epson profile vs. the Profile Prism profile.

Very easy to do using the color management feature mentioned above.

Fred
« Last Edit: November 22, 2011, 04:34:53 PM by Terry-M » Logged
ronzie
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« Reply #4 on: November 22, 2011, 08:13:19 PM »
Thanks for all replies.

I was just checking because I printed a test gray scale gradient (as a color image) with three different modifications using a profile editor and did not see much any change in Q's soft proof or the print. The profile I chose did show up in the lower print (job?) properties pane on the right.

I'm using a trial run of a profile editor called Color Darkroom and I have two more saves left. I'll really distort one as a test.

I'm using the Colormunki Photo to create version 2 icm profiles and I have a nagging green cast in the lower 30%. (I let both dye ink initial target and then correction target dry for 24 hours.) I'll run its optimize feature on the gray scale to see if it improves.
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Terry-M
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« Reply #5 on: November 22, 2011, 10:34:49 PM »
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I'm using the Colormunki Photo to create version 2 icm profiles and I have a nagging green cast in the lower 30%. (I let both dye ink initial target and then correction target dry for 24 hours.) I'll run its optimize feature on the gray scale to see if it improves.
Let us know how you get on with this, I'm sure ColorMunki users and potential users will be very interested.
I assume this is the feature where you produce a special target made by scanning the problem colours on a print with the device and then modify the profile by scanning the special target?
Terry
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ronzie
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« Reply #6 on: November 23, 2011, 09:48:50 PM »
In the CMP you optimize by selecting a typical image content as your spectrum you want to optimize. I then produces a target patch for scanning based on the I suppose 'demographics' of the colors involved instead of creating a standard patch chart.

So if I use the gray scale test image I have (gray scale test ramp from http://www.northlight-images.co.uk/downloadable_1/DL_page.html ) it should produce a target of patches from that gray scale. I think it then produces a correction target. I'll post when I get it done.
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ronzie
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« Reply #7 on: November 25, 2011, 05:28:53 AM »
OK. Here's my experience with the CMP optimization:

I let the CMP warm up a bit and started the application. You choose Profile My Printer. You then choose Optimize My Profile. Then you input the profile you wish to optimize, the new name for the profile, and then your sample image to base it on.

I then printed out a patch target to scan. I let the dye inks dry for about 90 minutes and then did the scanning procedure. I then clicked Save and it crunched out a new profile.

I then registered it in Windows for the printer followed by using Q Pro to print out that same target.

The good news:
The green color cast was gone but there was very slight but acceptable magenta cast in the center range.

The bad news:
The gray scale was not quite as linear as the original with a bit more of black compression.

I think instead of the composite image I had with a continuous gradient and a stepped gradient I need to simplify it to the 5% steps leaving out the continuous scale. I also printed a color test image and it looked pretty good for color, the very slight magenta cast in the middle tones not being noticeable. Before optimizing one could see the green cast in the darker tones from 30% to 0.
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ronzie
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« Reply #8 on: November 26, 2011, 11:10:05 PM »
I edited the test target image to include only the continuous gray scale and it gave me OK results optimizing from the original profile. The green cast in the lower 30% is negligible and the gray scale is now contiguous without any stepping. I printed the full test target from Q and also Elements 10 managing color and the prints matched for two different subjects except of course for the Q print being sharper.

So there's the summary requested for now.
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