Details
Given a 64x64 grayscale image in plain PGM format, convert it to a palette of black (0) and white (255) using the Floyd-Steinberg algorithm. Print the result, using "#" for black and spaces for white.
The input is 3 lines of header information, followed by 4096 pixel values, each on their own line.
P2 # magic number 64 64 # image dimensions 255 # maximum pixel value 19 # (0,0) value 18 # (1,0) value ...Pixels are processed one at a time, left-to-right then top-to-bottom. For each pixel:
- Let
a
be the pixel value. - Let
b
be the nearest palette value toa
(either 0 or 255). - Set the current pixel to
b
. Now a "debt" ofa-b
needs to be spread to 4 of the neighboring pixels. For each of these 4 neighbors and its corresponding fractionf
(as seen below), addfloor((a-b)*f)
to its value.
-- -- -- -- [] 7/16 3/16 5/16 1/16Notes:
- Some pixel values may temporarily become less than 0 or greater than 255.
- When processing pixels on the edge, any adjustments made to pixels outside of the image should be ignored.
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