The patches on the Argyll chart are about 6.2 to 6.4 mm. They may vary a little bit depending on the colour and amount of ink bleed. That's measuring as carefully as I can with a digital caliper. I'm wondering why you didn't use the same sizes and configuration as the charts produced by X-rite software? They have 29 patches per row and each patch is 6.7 x 12mm. Regards - Phil -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: Tuesday, August 16, 2011 10:19 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: DTP20 (Pulse) patch size error Philip Reed wrote: > I checked again and yes, the patch widths are 6.4mm at most. Perhaps 6.3mm. > I'm using a digital caliper. So that's measuring a bunch of patches and taking the average ? > If there is a scaling error, I'm not sure how > that would be introduced? I'm using the same software and printer driver to > print the patches from ColorPort or Monaco. I always make sure that any > scaling is off. Somtimes printers don't quite print at the resolution that say they do. What's of interest is what margin the DTP20 has. The test chart document doesn't mention this, it just talks about exact sizes. The hint from your experience is that the DTP20 tolerates a slightly too long patch more than a slightly too short patch. I have no idea what the limits are though, since my experience was that it would not read a TID strip with patches at 6.5 mm for instance, they had to be exactly 6mm. > Any option that allows for the scaling of patch width and height would be > appreciated. It's at the stage of needing to fiddle the values and re-compile. Graeme Gill.