Gutenprint / CUPS Dye-sublimation drivers

  • Status Closed
  • Percent Complete
    100%
  • Task Type Bug Report
  • Category Mitsubishi CP-Dxx family
  • Assigned To
    pizza
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version 1.0
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Gutenprint / CUPS Dye-sublimation drivers
Opened by pizza - 2014-05-13
Last edited by pizza - 2015-07-23

FS#525 - Output on CP-D70 is way too dark

This suggests we need to apply a correction curve to the raw 16-bit data sent to the printer.

Uncertain if user was using the ICC profile.

Unfortunately it'll probably take some careful analysis of printing calibration targets to come up with an appropriate correction factor.

Closed by  pizza
2015-07-23 17:55
Reason for closing:  Deferred
Additional comments about closing:  See #503
Admin
pizza commented on 2014-08-18 19:34

A couple of things -- one, the printer is actually a YMC model rather then BGR.

Second, though the data is 16-bit, it appears to be non-linear, thus "too dark" output.

Admin
pizza commented on 2014-11-21 19:34

Things are worse -- the printer uses inconsistent, non-linear mappings -- printing a solid color on the page shows a gradient of image intensities when it's sent to the printer.

Much investigation is needed to sort this one out.

Admin
pizza commented on 2014-12-04 01:58

Turns out the Windows drivers includes a set of tabular data files that appear to control things, one for each print mode (ie Fine vs Superfine vs Ultrafine)

Of course, interpreting these tables is another matter. There are 18 columns...

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