Re: [Linux-fbdev-devel] Re: Framebuffer API with backlit displays

[<jg...@pa...>]

I don't much care what the range is.  0-10 seemed a bit low to us as a 
range, and the hardware we have today has a range of a couple hundred, 
though the highest values have to be avoided due to lifetime/power 
consumption.  So we arbitrarily matched what WinCE did and limited the 
the high value to what we understood the limits on frontlight lifetime 
dictated, and rescaled to match.

Moral: most/all hardware will have to have a simple rescaling/limit testing 
anyway, so it is pretty arbitrary.  Besides guessing that 0-10 or 0-15 
isn't quite enough granularity, I don't care if it is 0-255, or 0-65535.

Remember, the eye is a logarithmic device, so you have quite a few
decades of intensity to cover.  I'd pick either 0-255 or 0-65535, rather
than 0-15.

				- Jim

--
Jim Gettys
Cambridge Research Laboratory
Compaq Computer Corporation
jg...@pa...