I was talking about the 'DIY' approach, i.e., stream raw image data in the proper pixel format.
For the browser approach, you probably actually *don't* want to do that, because Nickel runs @ 32bpp, so you'll probably want to send images encoded in a format that decodes to RGBA to avoid an extra Y8 <-> RGBA roundtrip on Qt's side on the device.
(The extra bandwidth needed by RGBA over Y8 is *usually* still faster than the extra processing power needed by the grayscale expansion to RGBA, but YMMV. Overhead is in a different place in each case, but it's still there one way or the other. Have to DIY to get rid of any overhead on that front
).