Re: [Gimp-print-devel] Gutenprint and Epson Pro 7900

[Walker B. <fo...@wa...>]

Add to -> Some Day Making a Proper RIP UI. 

Best and cheers,
Walker


> On Feb 15, 2021, at 9:01 PM, Alvaro Kuolas <ku...@gm...> wrote:
> 
> I was thinking of doing a separate graphical application that edits the XML for that purpose.
> 
> It is a very common issue on these EPSON large format printers. I've read in numerous forums that Green or Orange channels clog up.
> 
> I believe if we document (outside Gutenprint but using Gutenprint, to not disturb the project) and make an easy solution we could save printers from going to waste.
> 
> On Mon, Feb 15, 2021 at 12:53 PM Walker Blackwell <fo...@wa... <mailto:fo...@wa...>> wrote:
> It really would be a pretty cool feature to allow for Channel remap changes right in the PPD . . .
> 
> Best,
> Walker
> 
> 
>> On Feb 15, 2021, at 8:34 PM, Alvaro Kuolas <ku...@gm... <mailto:ku...@gm...>> wrote:
>> 
>> To print 6 colors on EPSON Stylus Pro 7890 I need to use <InkName translate="text" name="PhotoCMYK" text="Six Color Photo" InkID="CcMmYK">
>> 
>> To swap the Ink Channels on 7890 we need to modify the pro_ultrachrome_k3v.xml file.
>> 
>> If I want to change the Yellow Color to Light Black I would need to change:
>> 
>>    <channel name="standard_yellow" index="3">
>>     <HueCurveParam name="YellowHueCurve"/>
>>     <subchannel color="4" name="Yellow" text="Yellow" translate="text">
>>      <ChannelDensityParam name="YellowDensity"/>
>>     </subchannel>
>>    </channel>
>> 
>> To:
>> 
>>    <channel name="standard_yellow" index="3">
>>     <HueCurveParam name="YellowHueCurve"/>
>>     <subchannel color="0" subchannel="1" name="Yellow" text="Yellow" translate="text">
>>      <ChannelDensityParam name="YellowDensity"/>
>>     </subchannel>
>>    </channel>
>> 
>>  
>> The color is the low 4 bits of the hex value; the subchannel is the high 4 bits.
>> So LightBlack has a hex value of 0x10 and Yellow has a hex value of 0x28.
>> 
>> Well, That is in theory. I have searched this mailing list for all the bits I could find about this.
>> 
>> Is this right? I am missing something?
>> 
>> I could not test it yet because I do not have all the inks on the printer, I am waiting for them to be delivered.
>> 
>> Meanwhile I am learning as much as I can from Gutenprint. I am trying to gather information as much as I can.
>> 
>> When I finish this I will try to write a tutorial of sorts because this topic seems to surface from time to time in the mailing list.
>> 
>> Thanks for your patience and good work!
>> 
>> On Mon, Feb 15, 2021 at 5:24 AM Alvaro Kuolas <ku...@gm... <mailto:ku...@gm...>> wrote:
>> I have a 7890 (same as 7900 but with 8 colors instead of 10: no Orange, no Green channels).
>> 
>> I have a busted Yellow Channel, and possibly the LLK as well.
>> 
>> It is possible to make it print in 6 colors? Like CcMmYK ?
>> 
>> I could reorder the channels as described in this thread, but, How to make it behave like a 6 color printer?
>> 
>> Thanks!
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