How about using M1 measurements? Since "GRACoL Uncoated 2013" aka CRPC-3 mandates M1 measurements? It's in the header after all : ISO28178 ORIGINATOR "CGATS" FILE_DESCRIPTOR "CGATS21-2-CRPC3" # Characterized Reference Printing Condition 1, Universal Premium Uncoated CREATED "December, 2012" MEASUREMENT_GEOMETRY "ISO 13655 - Reflection, M1, white backing" <<<<<<<<<<<<< ------------------------ FILTER "D50" # Reference White Point (LAB) = 95.00 1.00 -4.00 # Reference Black Point (LAB) = 27.08 -0.19 1.07 NUMBER_OF_FIELDS 8 BEGIN_DATA_FORMAT SAMPLE_ID CMYK_C CMYK_M CMYK_Y CMYK_K LAB_L LAB_A LAB_B END_DATA_FORMAT NUMBER_OF_SETS 1617 BEGIN_DATA Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Mike Stewart Sent: Wednesday, December 4, 2013 11:49 AM To: colorsync-users@lists.apple.com Subject: GRACoL 2013 Hello All: I hope I can explain myself clearly. We are using an Indigo as a "proofer". We proof simulating various printing conditions. With the Indigo we are able print on the actual stock the printer will use (most of the stock is being supplied by the printers themselves). We use ORIS Color Tuner to maintain colour and Hot folders to process files. Our workflow is as follows. We get the Indigo into a repeatable state. We run an IT8 through ORIS (various iterations) until we have a colorimetric match to the printing condition (Ex. GRACoL 2006). We use paper stocks that fall within spec. for GRACoL. As long as the printer is using stocks that also fall within the GRACoL spec. we have a "match" between our proof and the printer. All this is fine until we come to uncoated stocks with high levels of OBA's. Before the release of the GRACoL Uncoated 2013 profile we would set up on an uncoated stock that was within the spec. for Fogra 47. We would measure the IT8 with an ISis using the UV Cut measurement. If we were proofing on printer supplied paper with higher levels of OBA's than the spec. allowed, we simply let the colour go where it went. This works quite well until we run into the situation where the printer (making their own proofs) would use a UV cut measurement on stocks very heavy in OBA's. Now the two proofs will not match. What is the best way to set up in this scenario? Should I use the UV Cut or not on papers with high levels of OBA. Remember - I am not simulating on an Inkjet, I am using the actual printing papers on an Indigo. Is there a correct way as a rule of thumb? Thanks - Mike Stewart