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

[Helge Blischke]

Hi Matt,

please post (an URL to) the part of an error_log (with debug-logging  
switched on) containing the messages of a
test job that exhibits the "Filter Failed" error.

Helge

Am 21.07.2014 um 16:13 schrieb Matthew Warren:

> Hi Helge,
>
> We have come across a problem that when users try and print to their  
> non Zebra printers, they are getting errors such as "Failed - Filter  
> Failed", is there a way to set the gsfilter to only fire for the  
> Zebra printer instead of all printers? Maybe changing something in  
> the CONVS file?
>
> Matt
>
>
> On 15 Jul 2014, at 18:23, Helge Blischke <HelgeBlischke at web.de> wrote:
>
>>
>> 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
>>
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