Re: Gutenprint and Epson Pro 7900

On 2/15/21 8:34 PM, Alvaro Kuolas 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 believe that is correct, yes.


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