At 02:10 PM 5/21/2005, Marti wrote:
Black preservation deals with CMYK -> CMYK transforms, and is intended to preserve, as much as possible, the black (K) channel whilst matching color by using CMY inks. There is a tradeoff between accuracy and black preservation, so you lost some accuracy in order to preserve the original separation. Not to be a big problem in most cases, benefits of keeping K channel are huge!
We've implemented a similar feature on top of lcms in our PDF Enhancer software (http://www.pdfenhancer.com), and I'm curious what the implementation differences are.
Are you simply saving the K, performing the transform, and then restoring K? Are you doing any special casing of [0 0 0 K]? What about [C M Y 0]?
The feature is indeed an important one for CMYK->CMYK transforms, which is why we've implemented it along with a variety of others. But I'd like to know more about your specific details - and happy to share what we've done on top of lcms...
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