xPLRioNet - A Challenge

["Tony Tofts" <tony@xxxxxxxxxx>]

Hi all,

While coding up routines to handle the riot display for the Rio in
xplrionet
I thought it would be a bit of fun to include the ability to render an
image
onto the rio's screen...

I'm currently looking at a Rio which is displaying an Album cover ;-)

Problem is the conversion from colour bitmap to pure black and white (not
grey scale) isn't great.

I'm currently taking a pass thru the bitmap, taking an average of the RGB
per pixel, and then an overall average.

Then when rendering if the total of rgb < than the average it's black,
else
it's white.

But I think it could be a lot better. I believe you have to do stuff like
giving each RGB part a different weighting?

So the challenge is... Can someone find a (not too complicated) formula to
give a decent image please?

Many thanks
Tony




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