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HELP! BIZZARE Fiery tinted backgrounds from PDF PROBLEM!
Hi! I am trying to help someone who has a major problem with
backgrounds showing a tint when printing from Acrobat. It's like a greenish tint. The problem wasn't always there. Usually it's a graphic--like a scan, where the white area would show up as a tint. I tried fixing one PDF, and I exported to Photoshop as tiff, and found that the white areas were 255,255,250, so I upped the red a bit by like 5% and then the whites didn't have the tint anymore (in fact the tint was affecting the whole document). THE WIERD THING IS: The SAME PDF was printed on various other printers and there was not tint. Looks like the difference between Red 250 and 255 isn't enough to show as a tint, but for some reason something is exaggerating it. The printers are a Xerox 3535, and a Xerox 7300. The driver is the Fiery PS driver. I've seen some similar questions years ago, and the answer was that the video card or monitor were misadusted but that makes no sense because as I'm saying the same files will print elsewhere fine, and the problem was not there before. I suspect it's a driver/or misconfiguration problem... Just don't know how to get rid of it. Thanks for any insight... Tek. |
#2
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In message , TekWiz
writes I've seen some similar questions years ago, and the answer was that the video card or monitor were misadusted but that makes no sense because as I'm saying the same files will print elsewhere fine, and the problem was not there before. I suspect it's a driver/or misconfiguration problem... Just don't know how to get rid of it. Have you got any colour management things (ICM or some colour profile) running in the printer driver, if so try turning all colour management off and see if that makes a difference. -- Timothy |
#3
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I analyzed the whole situation and you are right--it's a color
management issue. Documents with no color management in them, get managed by incorrect settings in the RIP so white graphics tend to come out tinted green. On Fri, 13 May 2005 09:51:37 +0100, " wrote: In message , TekWiz writes I've seen some similar questions years ago, and the answer was that the video card or monitor were misadusted but that makes no sense because as I'm saying the same files will print elsewhere fine, and the problem was not there before. I suspect it's a driver/or misconfiguration problem... Just don't know how to get rid of it. Have you got any colour management things (ICM or some colour profile) running in the printer driver, if so try turning all colour management off and see if that makes a difference. |
#4
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Oh, lemme add that in fact, Xerox addresses this exact issue on their
website! Correcting for white Photoshop background that prints as a very light color Do one of the following to alleviate the problem of the white background printing as a very light color. Verify the image contains pure white by referencing the CMYK and RGB percentages in the Info palette Convert the file format for the image from RGB to CMYK, then try printing again. After selecting Print, click Print in CMYK in the Print dialog box. If using the RGB format is necessary, the problem can be corrected by changing the white point of the monitor, which is adjustable from Photoshop. If background whites are printing with a yellowish tint, then the white point value is too low and should be increased. If background whites are printing with a bluish tint, then the white point value is too high and should be decreased. The default value is 6500 K. To change the white-point value for the monitor, do the following: In Photoshop versions 3 and earlier: From the File menu, select Preferences. In Photoshop version 4: from the File menu, select Color Settings. In Photoshop versions 5.5 and 6: from the File menu, select Color Settings. Select Monitor Setup or RGB Setup. Select White Point, then alter the value as needed. Other factors may also contribute to this effect: Because of differences in monitors and printers, it is common for an image to contain residual data in the white areas that will not show on the monitor, but will on printed output. It is important to make sure that it is a pure white background that is being printed, not some very light color, such as two-percent yellow. Use the Info palette to see the CMYK and RGB values of the pixels under the pointer. When the RGB values have all reached 255 and/or the CMYK values are all at 0%, you have attained a pure white. Check the TekColor correction in use (available from the Print dialog box). Using the SNAP Press correction can cause a slight coloring of the background in some cases. Select a different TekColor correction. Commercial Press. is recommended for CMYK images and Vivid Blue for RGB images. If the image is imported into QuarkXPress from Photoshop, be sure that the background is set to None for that image. Also, from the Page Setup menu in QuarkXPress, set EfiColor Profile to None. If printing from a Macintosh running System 7.5, select Control Panels from the Apple menu, then select Extensions Manager. Make sure that QuickDraw GX, QuickDraw Help, and ColorSync are all disabled, unless QuickDraw and/or ColorSync are specifically in use. Historically, printing presses have used the four-process (CMYK) color separations for printing a wide range of color, requiring images to be separated into four separate plates. With digital imaging, files are scanned in an RGB format, requiring a translation before going to press; hence, the use of CIE Lab to map colors between RGB and CMYK It is this translation and mapping that results in shifts between RGB and CMYK, as stated above. On Fri, 13 May 2005 09:51:37 +0100, " wrote: In message , TekWiz writes I've seen some similar questions years ago, and the answer was that the video card or monitor were misadusted but that makes no sense because as I'm saying the same files will print elsewhere fine, and the problem was not there before. I suspect it's a driver/or misconfiguration problem... Just don't know how to get rid of it. Have you got any colour management things (ICM or some colour profile) running in the printer driver, if so try turning all colour management off and see if that makes a difference. |
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