Hi, At least for HP ones, the normal operation is to use an output profile in CMYK and then a devicelink for the 4 to 8 separation. It is quite possible to do a output profile directly operating in 8 inks, but may generate "bubbles" in the gamut hull, that is, zones no covered by any ink combination. This of course if you are using the color management inside printer, sending jobs by web submitter or ftp. If you are using windows driver, the operative is slightly different, there is a devicelink from RGB to CMYK and then the 4 -> 8 devicelink for separation.
Regards, Marti Maria The little cms project http://www.littlecms.com ----- Original Message ----- From: "Yvan Richard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, May 19, 2004 2:16 AM Subject: [Lcms-user] Understand color matching inside Inside printer driver Hello, New inkjet printer use actually more than 4 colors, from CcMmYK to CcMmYyKk. I know that we can do ICC Color Profile for more than eight channels, but I think that Manufacturer 'HP, Canon Epson' don't do it. I take a look on the stylus photo R300 printer driver and find an ICC color profile, but it's an input color profile RGB to PCS. I find some rsrc files, inside which we can find informations about Printer setting, 'Halftone, weaving, paper...' and an information about Color conversion 'Tag AB..', but I don't know if it's CMYK or CcMmYK. I there someone who know how is made color matching for more than 4 inks inside the driver. Is it really 8 channels interpolation or simply CMYK interpolation, and after 1D Lut are used to find little c, m, y,k on 8bits per components. Or, in an other way : CMYK interpolation, halftoning 8 to 1 or 2 bits per components and: if Y==1 & M==1 then //red m=1 if Y==1 & C==1 then //blue c=1 Any comments will be welcome. Thank you very much. Best Regards. Yvan. ------------------------------------------------------- This SF.Net email is sponsored by: SourceForge.net Broadband Sign-up now for SourceForge Broadband and get the fastest 6.0/768 connection for only $19.95/mo for the first 3 months! http://ads.osdn.com/?ad_id=2562&alloc_id=6184&op=click _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------- This SF.Net email is sponsored by: SourceForge.net Broadband Sign-up now for SourceForge Broadband and get the fastest 6.0/768 connection for only $19.95/mo for the first 3 months! http://ads.osdn.com/?ad_id=2562&alloc_id=6184&op=click _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
