drivers on OSX?

[iraklis7302]

Re: drivers on OSX?

on the copiers in system settings find

Auto Color Level Adjustment

and tinker with that.

still nothing...the same results...

[Synthohol]

Re: drivers on OSX?

then fix the document, it must have been created with process/composite black instead of pure black.
thats maybe why it cant escape printing in color.
ive had 100% luck using foxit reader to print mixed pages that they click correctly.
im sorry you are going through this, sometimes black images or text are dropped over a color one on the page so you cant see it on the monitor but its a color underlying layer and the copier sees this and switches to black overprint instead of just pure black.

[allan]

Re: drivers on OSX?

I have used CUPS and the PPD's since i first encountered unix based systems. Try installing the correct PPD using CUPS.
Don't know about all the brands but some will only disengage the CMY if a certain amount of consecutive b/w pages are detected.
It will not change to b/w after 5 pages but will if there is more per example. Not sure if that is the case any more.

[iraklis7302]

Re: drivers on OSX?

then fix the document, it must have been created with process/composite black instead of pure black.
thats maybe why it cant escape printing in color.
ive had 100% luck using foxit reader to print mixed pages that they click correctly.
im sorry you are going through this, sometimes black images or text are dropped over a color one on the page so you cant see it on the monitor but its a color underlying layer and the copier sees this and switches to black overprint instead of just pure black.

[B0265]

Re: drivers on OSX?

That is correct. If the RGB values for "grey" areas in the pdf file are not equal (like R=128,G=128,B=128 etc) the printer thinks it is colour.In the PCL driver (Windows only) there is a setting "covert to greyscale" that allows you to set threshold value for RGB differences 1 to 20 to solve this.