Re: Gutenprint and Epson Pro 7900

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 <[email protected]> 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 <[email protected] <mailto:[email protected]>> 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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