[argyllcms] Re: DTP20 (Pulse) patch size error

  • From: "Philip Reed" <philipreed@xxxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Thu, 18 Aug 2011 13:54:15 -0400

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
> 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
> 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.

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