View Full Version : Colorflow and Dotshop

02-03-2011, 02:45 PM
Can Colorflow be used with Dotshop? We have been using Dotshop to handle various needs for a while, examples being special screens for screened blacks, fix moire issues on images, custom curves for "problematic" images. The ability to select and control individual elements very useful.

How does Dot Shop fit into Colorflow.

02-03-2011, 04:25 PM
That's a really good question, Mark. Right now, the only integration point that ColorFlow fits with Dotshop is with curve generation and export in .hmy format for use in individual curve application to objects. Kind of ugly, as you have to export every grey balanced curve out of ColorFlow back into harmony.

There are plans to tighten the integration so that you can declare a device condition and color setup to apply to an individual object. Since ColorFlow does not produce names for curves per se, the above combination of variables will allow you to select the curve you need simply by selecting something like "GRACoL C1: Approved" (color setup:snapshot), "<print device>", and "<print condition>".

Although, I always thought that different curves would be applied to different objects in a page based on screening requirements. For example, having both FM and AM objects in one page. In this case, you would need two curves to control the differing gain produced by the two screens. You mention that you use custom curves to control "problematic" images. Can you elaborate on this?


02-03-2011, 04:59 PM
A recent situation we had last month. Customer supplied proofs, customer supplied PDFs. On one 16 page form we could not get the 1 page to match the supplied Signed off Proof. If we tried to push the page the rest of the form went bad. We determined that the proof supplied was "not good" as all the other pages matched very well. The customer sign off on THAT proof and want us to match THAT proof. As we examined the page the real issue was in an image across the bottom of the page, to much Magenta. The top half actually needed a little more Magenta.

The PDF contained a number of transparent effects, was a Flatten 1.3 PDF and basically not editable. Our solution was to create alternate curve that dropped the Magenta and used Dot Shop to apply it to that bottom image. (there was a nice division between the top and bottom image which helped). We then applied another Dot Shop to the top.

Put it on press and got a very nice match, happy customer, and deadline met.

02-04-2011, 09:05 PM
I would cry if a customer supplied their own proofs and to top it off... only pdfs.