While this is no solace to anyone using the ACPU for Argyll targets what appears to be happening is the ACPU tries to center the target set to the selected paper size. There is plenty of room for margins within the Argyll generated TIFF file. I just printed out a target using the ACPU and one using Photoshop CS5 and you can see exactly what Philip has observed. I'm printing on US Letter size paper so excuse the inch units but here is what I get. PS CS5: approximately 7x9 1/8 inches for the target set; ACPU: approximately 6 5/8 x 8 3/4. It's really quite difficult to measure with any precision the difference in the patch width and height with a ruler though one can extrapolate from the overall dimensions of the set that the shrinkage (at least in my test) is about 2.7%. Crudely, the PS CS5 patch length is 10mm and the ACPU would be expected to be 9.8mm or a little less which I cannot measure reliably as noted. With an i1 Pro this did not result in any errors in skipped reads; whether it results in actual reading errors I cannot say as I would have to print targets out using CS4 (which unfortunately is not on my computer any longer but I will have to re-download from Adobe). As far as I know Adobe has not taken any action to address this matter. I'll repost on Luminous Landscape where some of the Adobe engineers participate to see if there are any plans to do so. Alan -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Philip Reed Sent: Friday, August 19, 2011 12:39 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: DTP20 (Pulse) patch size error Hi, I tried various page margin adjustments with the -m parameter, but ACPU still shrank the chart and always by the same amount....hence my frustration. Actually the problem is a well documented one and is actively being discussed on various forums. Regards - Phil -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: Friday, August 19, 2011 3:40 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: DTP20 (Pulse) patch size error Philip Reed wrote: > in Photoshop CS5 and completely disable colour management. A solution is to > use the Adobe Color Print Utility. However, I've found that this utility > does not seem to print the chart 1 to 1 but shrinks it a little. I tried Hi, that's rather a problem, since the sole purpose of Adobe C.P.U. (ACPU) is to print test charts ! Have you tried altering the page margin that printtarg allows, using the -m parameter ? It's possible that ACPU is scaling the test chart to fit it within the printable area (although this would be unhelpful behavior for a test chart print application - it should always crop rather than scale). Perhaps it's worth raising this issue with Adobe on one of their forums, or on the Apple Colorsync list ? Graeme Gill.