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

  • From: Bob Coss <bobcoss@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 16 Aug 2011 10:29:58 -0400

Here are my notes un using the DTP20 from about 3 years ago.  I'll dig
one out and see if I can get it to work on the most recent versions
under XP and Ubuntu.   I got good results in the past, but had
problems with chart read crashing ocasionally.

Hope it helps some.


DTP20 Argyll Notes
 Editado el 20/11/08 por bobcoss

Target Patches Table

For the dtp20 device, there is always a header row for the first page.
You must subtract one row from the recommended number of rows for the
first page.  subsequent pages can have the full number of rows
recommended by targgen.  You can use the following table to determine
how many patches to print per row for different sized papers.

Letter 8.5x11, 30 patches per row, 19 rows per page.
1 page  = targen -v -d3 -f540 patchfile
2 pages = targen -v -d3 -f1110 patchfile
3 pages = targen -v -d3 -f1680 patchfile
4 pages = targen -v -d3 -f2250 patchfile

targen -v -d3 -f2250 patchfile
printtarg -v -i20 -t -pLetter patchfile

11x17 paper, 30 patches per row, 41 rows per page.  Note!  That the
dtp20 has a limit to the number of patches it can hold internally. I
havn't figured it out yet, but it wouldn't recognize the header row of
the 3 pag 11x17 target.  I had to read it tethered

1 page  = targen -v -d3 -f1230 patchfile
2 pages = targen -v -d3 -f2430 patchfile
3 pages = targen -v -d3 -f3660 patchfile

targen -v -d3 -f3660 -c5100_PBPG260_S5_D50.icm -A.8 patchfile
printtarg -v -i20 -t -p431.8x279.4 patchfile

To use an old profile to precondition the new printer target add the
following options: -c oldprofile.icc -A.8

Once targets have been printed, let them dry

1. Calibrate the dtp20
2. Push the activator 1 time, and after the beep read the header
3. Push the activator 1 time, and after the beep read the first strip
4. move the guide down 1 row, and repeat with #3 until all have been read.
5. The unit will pulse the green light when all the patches have been read.

chartread -v -c1 patchfile   = to read the patch data.

colprof -v -D"Printer A" -qm -S ../sRGB.icm -cmt -dpp PrinterA

You can specify a different input profile than sRGB.icm.  The
documentation recommends using a profile closest to the color space
for your images.  So far, I've noticed that sRGB works good for most
of the images I've printed after creating the profile.

Using the DTP20


1. From a green light, click 3 times to enter clear memory mode (solid blue).
2. Rapidly press the button 3 more times to enter calibration mode
(solid yellow).
3. move the cover for the calibration patch
4. Press down on the activation button and hold.  The indicator light
will remain yellow.
5. When the calibration is complete, the unit will beep, and the green
light will come on solid.

Clearing Device Memory
1. Press the activation button 3 times.
2. When it turns blue, hold the button until it resets.

Read the Target ID
1. Position the unit to the left of the target.
2. Press and release.
3. When the unit beeps and the green light goes off, slide the unit to
the right.
4. When it has been read successfully, the unit will blink green two
times and beep

On 8/16/11, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
> 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.

Sent from my mobile device

Hay que aprender algo nuevo todos los días

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