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1
This was also a case of contrast deficiency, and correction was done by
fixed
thresholding
.
2
Fixed
thresholding
is the way to change the black-to-red contrast to the desired black-to-white contrast.
3
Fixed
thresholding
solves this problem as well.
4
Fixed
thresholding
was the first technique described, suitable for black-and-white text, when the contrast does not vary over the page.
fixed
thresholding
fixed
fix