Ive got a challenge I have a large format printer printing 6 colours. The RIP is using a 6 colour output profile and assumes Adobe1998 as the input RGB profile for RGB colours. However I dont have the ability to create 6 colour profiles so to get better matches I have created RGB profiles for specefic media through the RIP using relative colourimetric rendering intents. (Print RGB charts and create a profile)
This however requires that I convert any file to print to the specefic Printer RGB profile in Photoshop, However I do get very good results turning on Black Point compensation. For example the workflow for an Adobe1998 image is Adobe1998 > RCM+BPC > PrinterRGB > [RIP assumes Adobe1998 > RCM > Device 6 Colour ] Using this procecess I see the deltaE improve from around 4-5 to 1-2 for in gamut colours. What I could like to do is to use the PrinterRGB profile to UPDATE the A2B table of the 6 colour ICC profile. In effect making it more accurate - I could even hard-wire in PBC Im thinking this would involve creating a transform PrinterRGB > Adobe1998 > Device. To update the profile I would calculate the Device colour based on a 33x33x33 sample of the PrinterRGB PCS (Using LabD50?) then write the resulting colour back into on of the output profiles intents. i,e L50,a0,b0 = Device 1,2,3,4,5,6 then write those value unto the Device profiles LUT I could then bypass the steps in Photoshop and just print through the RIP with improved colour I think this could be done my making transforms however it seams a lot more accurate just to use LCMS to read the LUTs directly? Perhaps create a proofing transform and then read the resulting LUT in LCMS. I would appreciate some advice on A) Is there a solution that already exists for this? B) What steps would I need to do in LCMS to get this working? C) Am Im missing anyting? I beleive this is possible, while the conversion from Source RGB to Device Colour is over multiple profiles the path is static and pre-built. Thanks Glenn ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
