Interesting paper, although I know too little about the science behind
it to comment on how valid these results are on a wide range of screens.
The paper itself states that numbers may vary significantly between
displays and viewing conditions.
Here's a comparison of the paper's filter to FT's light filter:
http://postimg.org/image/mxc6oa6mv/full/ (no stem darkening). The
paper's filter appears slightly sharper or more contrasty on my monitor
but also slightly more colorful than FT's light filter.
Werner, Dave, what's your opinion on this? I would like to change the
documentation of ftlcdfil.h to note that stem darkening is better than
filters going over 0x100 and update the filter recommendation to the
light filter for now. Also, where does the [a-c, a+c, 2a, a+c, a-c]
formula come from? Is the "[a b c b a] where 2a+2b+c=1" formula newer? I
could include the paper's filter in the documentation and sprinkle it
with some source citations.
[1]: [a, b, c, b, a] where a = 0.0, b = 0.3, c = 1 - 2a - 2b = [0, 0.3,
0.4, 0.3, 0] =~ [0x00, 0x4D, 0x66, 0x4D, 0x00] with slight rounding
errors ;)
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