[cups] Mac OSX with CUPS 1.7.2 Printing fuzzy on Zebra GK420d

[Helge Blischke]

Am 15.07.2014 um 13:19 schrieb Matthew Warren:

> Hi there,
>
> We have created a 1 bit image at 203 DPI in PNG format (https://www.dropbox.com/s/ebs2dqf08d1fxy7/1stCLASS-36.png 
> ) which when we convert to RAS or PDF using cupsfilter works and  
> prints great.
>
> When we create a PDF and insert the image, then try and print, its  
> coming out bad. When we use cupsfitler (pdftoras) to convert to RAS  
> it comes out bad.  But we can check the image inside the PDF and its  
> exactly the same as the original, it has not been adjusted and looks  
> pixel perfect.
>
> Here is the PDF https://www.dropbox.com/s/17c4uz2z0jjtild/label-noscale.pdf
>
> Any ideas?
>
> Matt
>
>
>
>

Matt,

I did one more test using your label-noscale.pdf. The results are  
really disappointing:
the use of the default filter
cgpdftoraster
leads to a quite rugged raster image.
Obviously this filter internally performs at least two conversion  
steps using an unknown
inermediate format.
The result is the same with Mac OS X 10.5.8 and 10.9.4.

On the contrary, when using my home-grown gstoraster filter, the  
result is OK as you described
when using the original source image.

So, I'd suggest to modify your CUPS configuration to using my  
gstoraster filter. Note that
it requires a fairly recent version of Ghostscript (see the  
description on sourceforge.net).
If you happen to have MacTeX installed, version 9.10 of Ghostscript is  
already installed.

Helge