CUPS Dyesub Backends

  • Status Closed
  • Percent Complete
  • Task Type Bug Report
  • Category Mitsubishi CP-D70 family
  • Assigned To
    Solomon Peachy
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version 1.0
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: CUPS Dyesub Backends
Opened by Solomon Peachy - 2014-05-13
Last edited by Solomon Peachy - 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  Solomon Peachy
2015-07-23 17:55
Reason for closing:  Deferred
Additional comments about closing:  See #503
Solomon Peachy 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.

Solomon Peachy 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.

Solomon Peachy 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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