Re: ink restrictions and profile tweaks
Re: ink restrictions and profile tweaks
- Subject: Re: ink restrictions and profile tweaks
- From: David Wollmann <email@hidden>
- Date: Tue, 12 Jun 2001 15:23:41 -0600
- Organization: Luna Vista Imaging
Joachim Euler wrote:
>
From what I understand your prints only become "desaturated" when printing
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with your ICC-profile applied. I assume you apply the profiles from within
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PosterShop (which, BTW, uses Logo CMM since version 5.0).
>
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Applying a good "destination" profile of your large format printer is only
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one of three main factors you have to consider when working in an ICC-based
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workflow. The two others are:
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>
I think the biggest challenge I am faced with is that these are pigment inks on vinyl. The profiles I build for paper
medias and with Dye based Inks work fine for me. In this situation the colors that I'm having trouble with are from
Quark and now that I write this I am remembering that a photoshop import in the same document came up with too much
magenta in it for pleasing color. (CMS in Quark 4 is off. )
>
Applying a good "destination" profile of your large format printer is only
>
one of three main factors you have to consider when working in an ICC-based
>
workflow. The two others are:
>
>
1. The profile(s) which describe where your images come from
>
I assign all my profiles for Postscript work in Onyx. For my CMYK input profiles I am simply using a profile I made
from Photoshop of the standard SWOP setup. It seems that most client supplied images are in this configuration
already. For RGB I am using Adobe RGB. My inhouse drum scans print fine on all my printers, whether in RGB or CMYK.
For vector information I am also using the same Photoshop SWOP profile and generally I get very good results with
that setup. My only complaint is that with blues, that are vector, there is a bit too much magenta. At some point I
want to see if I can do a localized edit on the profile to correct that.
(I recently took advantage of the special Mr. Tobie mentioned Colorvision was having on their Web sit for their
software. It is a great deal and I purchased the entire suite since I had needs that Onyx could not help me with,
mainly RGB profiles. Doctor Pro is part of this package and as soon as I can learn how to bend time and space so that
I can create more time for reading technical stuff, I'll dive in and see how it can help.) :o)
Canvas profiles with pigment inks have been better then what I'm getting with the vinyl. The canvas does not require
the higher ink restriction that the vinyl needs. I did switch over to Colorspan's own vinyl which did help, I was
able to raise my ink restriction and my results improved some. However, these bright colors are still mapping too
dark and desaturated. Again, by doing a local edit in Onyx I was able to build that every import >Client Approved
Color<.
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2. The rendering intent you use.
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For most purposes I use perceptual, but in this situation maybe Relative or even Saturation Graphics would help. So,
I'll find the time, I know I put some extra time in one of these cabinets here... and do more testing. :o)
Thanks,
David.