Re: Who Does the Separations
Re: Who Does the Separations
- Subject: Re: Who Does the Separations
- From: Karl Koch <email@hidden>
- Date: Thu, 4 Jan 2007 17:17:45 +0100
| Happy New Year to everybody on the list (and off)!
Am 04.01.2007 um 15:00 schrieb Robert J. Hennessey: But the essential printing inks are CMYK. This is the final edit space and is useful because each color channel can be adjusted individually without affecting any other channel.
True, but the results are unpredictable! If you just want to make an image darker or lighter in CMYK, you may have to color correct certain areas afterwards. Due to an uneven gray balance, the "distance" between C,M and Y is different in different lightness areas. Thus, when you change lightness by moving all 3 channels up or down, you end up somewhere, where gray balance is different and you unintentionally introduce a color cast. This will not happen in a well behaved RGB working space, where gray is R=B=G. If CMYK is the destination of your image, then it will help insure your success to be familiar with what the CMYK numbers mean. There are many very good texts to use as a guide. Who would be familiar with all flavours of CMYK (newsprint, gravure, flexo ...)? Since CMYK is not equal to CMYK, the separation (or color transform) into a printing space (be it CMYK or RGB) should always be done as the last step. Otherwise you end up converting from one CMYK to another and a third ..., losing quality along the way in each one of the conversions. CYMK values are unsuitable to describe COLOR, CMYK just describes percentages of ink on paper (or film, or plates), without saying, what the ink looks like.
With a good printing profile, that matches the printing conditions, everybody can perform a perfect separation. That means, the separation needs to be done, when the printing conditions are known, i.e. at the printers.
Best regards,
Karl Koch
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