[argyllcms] Re: DTP20 (Pulse) patch size error
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 19 Aug 2011 11:47:14 +1000
Philip Reed wrote:
> 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.
Hi,
I followed X-Rite's documentation on creating the charts,
and fitted it into Argyll's existing chart printing code.
The documentation specifies exactly 6.5mm, which is what the PS and TIFF
files contain. My experience was that (for instance) using 6.5 mm patches
for the TID did not work, indicating that the documentation
needed to be followed precisely, which is what I did.
I have no information at the moment on what tolerance the
device will handle in this regard, or even if this is the issue at hand.
Combine that with (apparently) printers that aren't at 100% scale,
and it's hard to know which way to go. Should I add a fudge factor
of 0.2 mm, assuming that the device can handle larger but not
smaller patches ? If I do, what happens when someone prints the chart
on a printer running at 103% scale, and the patches come out at
6.9mm ? Will the instrument read them ?
It could be something else, such as the density of the start & stop bits.
The documentation says CMY 30/30/30 or 50/50/50, which is a little
ambiguous. How critical is it that it be CMY (ie. ink limiting) ?
What about RGB printers ?
Graeme Gill.
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