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#17940 - 02/27/04 07:23 PM Color Picker
Mason Offline
Member

Registered: 12/11/02
Posts: 122
Loc: Fairhope, Alabama
Hello,

When K value goes up, CMY values go down. If K value = 18, CMY values cannot equal more than 82 (100 - 18).
_________________________
Thanks,

Mason

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#17941 - 03/01/04 08:56 AM Re: Color Picker
Anonymous
Unregistered


Hi:

This is by design: Equal quantities of C,Y,M will produce a shade of gray. So (50,50,60,0) is the same color as (0,0,10,50) The color in this example is a yellowish gray. This technique is called undercolor removal.

This technique saves on toner use and is gentler on the equipment. (If your fuser has the slightest problem, a 400% black print will reveal it.)

Thank you

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#17942 - 03/01/04 12:57 PM Re: Color Picker
Mason Offline
Member

Registered: 12/11/02
Posts: 122
Loc: Fairhope, Alabama
Hello,

This, I guess sounds good on toner-based machines, but this is going on an HP Indigo, not a toner-based machine. Plus, the fact of the matter is [23,82,79,18] does not look like [23,100,79,18] we tested it even on one of our toner-based machines. When working within a color-match sensitive environment, as we do in the direct mail/print marketing industry, colors matter to a client - especially when dealing with large clients with corporate colors. In this example, [23,100,79,18] matches their corporate color perfectly (even on the toner-based machine), [23,82,79,18] does not and is unacceptable. Therefore, is there any way to over-ride this technique, or is there any way of adding a feature to over-ride this technique?
_________________________
Thanks,

Mason

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#17943 - 03/01/04 01:08 PM Re: Color Picker
Anonymous
Unregistered


(23,100,79,18) should be equivalent to (0,77,56,41). Please try these values and let me know if you get the same color.

Thank you

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#17944 - 03/01/04 01:26 PM Re: Color Picker
Anonymous
Unregistered


After trying this out, I was not able to enter the color I had specified. This has been reported to R&D and should be fixed.

Your cooperation in this matter is greatly appreciated.

Thank you

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#17945 - 03/01/04 01:46 PM Re: Color Picker
Mason Offline
Member

Registered: 12/11/02
Posts: 122
Loc: Fairhope, Alabama
Hello,

Thanks for your help!

Another issue that may need to be reported is: once I set my color, click OK, and re-open it, the color values aren't the same as they were when I clicked OK. Here is what happens. I create a new Box, then open the properties and go to the 'Color' section. I check 'Fill', and click on the color picker. Then I type in [23,100,79,18], it changes it to [23,82,79,18] which, as you say is expected. Now, I click OK on the color picker. The preview box updates to the new color, and I click OK on the Box properties dialog. Now I go back into the Box properties, go to the 'Color' section and click on the color picker. The values are now [0,59,56,40]. If you drag the color [23,82,79,18] to the custom colors, then click on the custom color it has already changed to [0,59,56,40]. Why do they change like this in both instances?
_________________________
Thanks,

Mason

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#17946 - 03/01/04 01:58 PM Re: Color Picker
Anonymous
Unregistered


Because we are trying to apply undercolor removal techniques to the colors, we modify the settings. We are currently re-evaluating the algorythm used in this procedure.

Thank you

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#17947 - 03/05/04 11:27 AM Re: Color Picker
Mason Offline
Member

Registered: 12/11/02
Posts: 122
Loc: Fairhope, Alabama
Hello,

Since R & D is reworking the procedure, my suggestion would be to also include a means of turning off UCR. Maybe make UCR the default color method, but allow a user to turn it of when printing to machines such as the HP Indigo.
_________________________
Thanks,

Mason

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#17948 - 10/18/04 04:02 PM Re: Color Picker
sbaxter Offline
Junior Member

Registered: 08/15/03
Posts: 21
Has this short coming been resolved. I'm am having the same problem and need this to be fixed as well. Also, in the meantime, is there a way to determine which of color matchs based on your "undercolor removal" algorythm.

S-

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#17949 - 10/18/04 04:25 PM Re: Color Picker
Anonymous
Unregistered


Hi:
There is good news on this question. Undercolor removal is implemented in the software ( Version 4.0.46.1540). The max value is set to 300, which should work out in most cases.

Hope this helps

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