Impression 5.7" light blue get displayed as green

pimoroni / inky

Combined library for V2/V3 Inky pHAT and Inky wHAT.

https://shop.pimoroni.com/?q=inky

MIT License

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Impression 5.7" light blue get displayed as green #195

Open Indiana8000 opened 2 months ago

Indiana8000 commented 2 months ago

Hello,

My Impression 5.7" display light blue as green, all other colores are very good. I also tried the dither.py:

fast method make a very large white area with some blue dots (realy uggly).
slow method looks near identical as if no hitherdither is used.
Saturation have no impact on the color change itself.

Any ideas what I can do to improve this?

This should be a gradiant from light blue to dark blue:

Gadgetoid commented 2 months ago

There's isn't really a "light blue" in Inky's palette so aggressive dithering is required to get there.

Someone created a tool for experimenting with dithering (https://github.com/pimoroni/inky/issues/126), and there are other methods out there. But with the combination of a low resolution screen and a very meh (I wish they'd just give us CMYKW) colour palette (which will always have that vintage pixel patina) it's always a tradeoff.

Still I'd have expected better results- what's your source image, can you reproduce it here?

Indiana8000 commented 2 months ago

Since I use it to display AI art, this is not a big problem for me. Lately I've noticed that I see more greenish images than blue. So I start experimenting with all 7 colors.

I just searched for "blue gradiant" and used the first match: https://getwallpapers.com/wallpaper/full/6/e/e/101557.jpg Would be interesting how it looks on your device.