QCAD - 2D CAD System.

Click here for a documentation of the DokuWiki formatting syntax that can be used in reports

Please search for existing tasks (also closed ones) before opening a new task.

Please make sure that you are using the latest Version of QCAD before posting a bug (menu Help > Check for Updates)


FS#537 - colors changed for print

Attached to Project: QCAD
Opened by Stefan (stefan) - Friday, 06 April 2012, 17:15 GMT+2
Last edited by Andrew (andrew) - Wednesday, 01 March 2017, 14:55 GMT+2
Task Type Bug Report
Category QCAD (main)
Status Closed
Assigned To Andrew (andrew)
Operating System All
Severity Low
Priority Normal
Reported Version 3 RC5
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


light grey is printed as black starting with RC5 (was grey in RC4 which was fine)

This task depends upon

Closed by  Andrew (andrew)
Wednesday, 01 March 2017, 14:55 GMT+2
Reason for closing:  Implemented
Additional comments about closing:  Threshold implemented
Comment by Andrew (andrew) - Friday, 06 April 2012, 17:20 GMT+2

What is the platform affected? I cannot reproduce this under Mac OS X.

Please double-check also if you have not (accidentally) enabled black / white printing in the print preview.

Comment by Stefan (stefan) - Friday, 06 April 2012, 19:55 GMT+2

Sorry for not marking my OS: it's XUbuntu 10.04.

It seems that not only white is transformed to black but also "near white" colors (which are not white with intend), black/white is not enabled (full color mode). The attached file shows the same behaviour in RC2 and RC4 as in RC5, in another file the printed color differs from RC4 to RC5 (perhaps another "white"-threshold?).

Comment by Andrew (andrew) - Friday, 06 April 2012, 21:01 GMT+2

Maybe for this use case it is better to switch off any color correction:
'Edit' - 'Application Preferences' - 'Graphics View' - untick 'Auto correct black and white colors'

Please let me know if that solves / does not solve the problem for you.

Comment by Andrew (andrew) - Friday, 06 April 2012, 21:08 GMT+2

The threshold might have to be configurable.. I can see the problem with the rectangle requiring color correction but the yellow / gray parts not.

Comment by Stefan (stefan) - Friday, 06 April 2012, 21:29 GMT+2

If the threshold could be configurable (or just turned off so that only "pure white" will be translated) that would be just perfect! :-)

I can switch off (for one file) and switch on (for another file) the translation, so it's not a "no go", but the configurable threshold would solve everything... ;-)

Comment by Stefan (stefan) - Friday, 06 April 2012, 22:52 GMT+2

I have to backpedal: after some tests, the "auto correct black and white colors" is not what I need - I would have to change the background to white while drawing, which is not comfortable.

So if it would be possible to have the correction only for "pure white" or if the threshold could be made configurable, that would ease things a lot.

Comment by Stefan (stefan) - Saturday, 07 April 2012, 07:36 GMT+2

After ;-) the night, I would suggest having the discussed options not only "for everything" but rather having them for both "screen viewing" and "printing". This would enable working with corrected colors and printing with defined colors. This also would solve my problem.