If I try to scan un-tethered, the TID can be read if I'm very careful, but any attempt to read strip A results in an error. I checked again and yes, the patch widths are 6.4mm at most. Perhaps 6.3mm. I'm using a digital caliper. 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. Any option that allows for the scaling of patch width and height would be appreciated. Does anyone have any opinions about the quality of profiles created with the DTP20 versus the Colormunki? Thanks for your help - Phil -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: Monday, August 15, 2011 5:44 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: DTP20 (Pulse) patch size error Philip Reed wrote: > Argyll doesn't ask to read the TID strip. This is what I get: If you do an un-tethered set of readings (ie. using the TID), does it work any better ? > The row patches from Argyll are 6.4 by 10 mm while the patches from > MonacoPROFILER are 6.7 by 12 mm. The TID patches are 6mm by 10mm for Argyll > and 6mm by 12 mm for Monaco. I'd be really surprised if a width difference of 2 mm is going to make any difference, given how much margin it has over the length. Are the Argyll patches really 6.4 mm ? (ie. is the average over the length of all the patches in the strip ?). I wonder if there is a small scaling error in the printing, and it is enough to take the patch below its minimum. > Is the instrument sensing bleed from the rows above and below that aren't > being masked using the Argyll chart? About a mm of the row above and below > isn't covered. Unlikely, since the aperture must be less than 6 mm if it is to read the patch cleanly. Looking at the test chart spec., it is possible to change the DTP20 patch length to some other values, although I haven't currently allowed for it. I'll see about adding this for the next release. Graeme Gill.