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Author Topic: White convert to light gray??  (Read 8813 times)
ahmed
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« on: June 07, 2014, 05:15:51 PM »

Hi
I did several profiles using Profile prism,the colors are noticeably improved , but i faced a tiny problem.
The white area in the printed image become little gray , even when i tested the profile in the Photoshop by "convert to  profile" the white turn to light gray, so it is not a driver problem.

Any one know what is my mistake?
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Fred A
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« Reply #1 on: June 07, 2014, 05:39:34 PM »

Quote
I did several profiles using Profile prism,the colors are noticeably improved , but i faced a tiny problem.
The white area in the printed image become little gray , even when i tested the profile in the Photoshop by "convert to  profile" the white turn to light gray, so it is not a driver problem.

Any one know what is my mistake?

Need to know all the details about how you set PP and the target charge number... did you set that correctly in PP?
I cannot figure any way to "make" that happen so you will have to fill in the details.
Did you scan to a RAW file? Did you answer the Yes or No question in PP properly?
What sort of reports do you get regarding Light variance exposure, and White balance?

Fred
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ahmed
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« Reply #2 on: June 07, 2014, 09:16:31 PM »

Thank you dear for your fast replay ,
I used the recommended settings that mentioned in the help file for the printer and scanner ( both are epson).
these are all the details:
 - the target charge number : R130730
 - for Prism target, i got these results:
        Exposure: image is properly exposed (231)
        White balance accuracy : 1% ( excellent - white balance is very accurate)
        Light variance: 5% ( excellent - even lighting across chart)
        3 patches marks with (x) art at minimum/maximum brightness
        shadow detail: Good - darkest gray patch clipped
- for Printer target ,  i got these results:
        Exposure : 223.
        3 patches marks with (x) art at minimum/maximum brightness
- After I Create the profile I got these final results:
       Printer/paper/ink dynamic range: 72.2
       Printer/paper/ink coverage of Lab space: 10.1%
       Smoothing required: 4 passes
       Printer profile usable range: 0-255, 0-255, 0-255

is there any thing else you need to know?
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ahmed
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« Reply #3 on: June 07, 2014, 10:22:20 PM »

I discovered on more thing :
before i edit the profile in the profile editor, the white area is very light gray
and after i edit it in the profile editor to fix the neutral/gray casting, the white area become more gray Huh/
hope this would help to solve the problem!!!
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Fred A
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« Reply #4 on: June 08, 2014, 10:00:45 AM »

Quote
I discovered on more thing :
before i edit the profile in the profile editor, the white area is very light gray
and after i edit it in the profile editor to fix the neutral/gray casting, the white area become more gray Huh/
hope this would help to solve the problem!!!

From your statement above, I am wondering if you are working the editor backwards.
In the editor, you are matching the the adjustments to a PRINT!!
Matching is the key word.
For example, Let's say that your test print is lacking contrast and the whites are gray.
If you make the adjustment to move the contrast slider to the right to make the whites whiter, you are working backwards.

What that does is assume you are MATCHING the right side to your print, and your print has TOO MUCH contrast, and therefore will lower the contrast when making the edit.

The principle of the edit screen is for you to have a test image on the left, (assuming a reasonably calibrated monitor) and a second copy on the right.
You make a print of the test image with the driver set to the same settings you used when you printed the target. (Paper selection, quality setting, No Color Adjustment), and the profile in position in Qimage.
Now you compare the print to the right side of the edit screen, and move sliders to MATCH no to correct.
See screen snap... right side is showing lower contrast, darker grays.... and will tell Profile Prism, that is what my print looks like: FIX it!

So if you see that your whites need whitening and the blacks are not black enough, you move the sliders left to lower the contrast to match.
Then the edit will compensate and lighten the edited grays to white.
That's all I can think of from your posts.
If I guessed wrong, you are welcome to email the profile to me and perhaps we can find something.  wathree.ssz@verizon.net

What paper are you trying to profile...

Fred
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admin
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« Reply #5 on: June 08, 2014, 01:33:26 PM »

Fred has covered it pretty well.  The only other thing I can think to ask is what your curves (bottom left) look like.  There are two sets: the first set that appears for a few seconds are the curves of the scanner and the second set are the curves of the printer profile.  Would it be possible to take a screen snap of the histogram before you click create profile, the first set of curves, and the second set of curves and post those three here?  We might see something in those.  The only way white will not be white is if there was some sort of problem in the printed target (since PP automatically adjusts the highest levels to be 255,255,255).

Regards,
Mike
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ahmed
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« Reply #6 on: June 10, 2014, 10:21:55 PM »

I did sevral profiles , one of them doesnt chang the white area to light gray , it keeps white(255,255,255), i dont remember how i did it
BUT???
when i edit it in the profile editor to fix the neutral/gray casting,the white starts to become grayHuh
i only reduced the yellow using the Color Tweaking Wizard and  picked the center dot in the color wheel to indicate that i want to make a change in neutral grays in the image, thats all i did

i sent both profiles to fred, to check

thank you all,,,
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