Registration/Alignment issue with Black plane on Magicard #48
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Reference: slp/selphy_print#48
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K extraction from RGB input data appears to work well, but when printing there's a registration problem. The black layer appears to print several pixels higher than the color layers.
I'm not sure if this is something that needs a fixed offset applied, or is something that can vary printer-printer.
On my old Tango 2E, the black data looks much better (but not perfect) if it's shifted down by 2 pixels. Might need to shift it over by one pixel too.
This frankly seems a bit suspicious given that the color registration is spot-on.
Or could one of the not-yet-figured-out firmware commands be there to adjust the K alignment?