Luminous Landscape Forum
Raw & Post Processing, Printing => Colour Management => Topic started by: r010159 on August 29, 2015, 09:20:13 pm
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I have been profiling a RIP for a CMYK profile. When I print using the RIP with its new profile, I notice subtle banding on the grey ramp. What can be causing this? The printer profile? Perhaps a more careful choice of target patches would help? A limitation of the printer? A RIP set up improperly? For that matter, how about RIP independent reasons? I am interested in understanding this phenomenon.
Thanks!
Bob
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On an Epson printer, I would expect clogged nozzles. What printer are you using? Is the banding over the full print?
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I have created a CMYK profile for my RIP. I had printed a standard printer test photo which includes a grey ramp. This is where I found subtle banding with the grey ramp. Between this and a green tint to the ramp. I am unable to use this profile. I have followed instruction for creating the profile per the RIP's manual. I am using an Epson 3880 with the PrintFab RIP.
Bob
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Do you get a good nozzle check? Clogged nozzles is the most common cause of banding.
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My nozzle check is fine. I do not get this from the RGB OEM profile which. by the way, reproduces the grey ramp as neutral.
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That's really odd. I've worked with a few RIPs and never seen anything like that, sorry.
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My nozzle check is fine. I do not get this from the RGB OEM profile which. by the way, reproduces the grey ramp as neutral.
Note that the black curve can make a great deal of difference to how obvious banding is. 100% GCR will make it most obvious, whereas a GCR that has a small amount of black will cover it up more effectively, but will have a less robust neutrals. This could be the difference between your profile and the OEM RGB workflow.
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Thank you for your very informative reply! I have so much to learn about GCR Mode, GCR Amount, Black Start, Black Width, TAC and so forth. I still have not figured out Black Start and Black Width...width of what?? Oh well, I will eventually learn this. :)
Bob
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I still have not figured out Black Start and Black Width...width of what??
I would imagine that "width" controls how far from the neutral axis the GCR extends. Narrow = UCR, Wide = GCR.
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Are you printing 8 bit? If so print 16 bit.
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OK. I will try that. Thanks.