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ImageMagick: Increase pdf scan contrast and sharpening #tools
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| convert -density 150 input.pdf -brightness-contrast 5x25 -sharpen 0x1 output.pdf | |
| convert -density 300 input.pdf -colorspace gray -normalize -level 50%,51% -sharpen 0x1 output.pdf | |
| convert -density 300 input.pdf -colorspace gray -normalize -level 25%,26% -sharpen 0x1 output.pdf | |
| convert -density 300 input.pdf -colorspace gray -normalize -modulate 150 -sharpen 0x1 output.pdf | |
| convert -density 300 input.pdf -contrast -contrast -contrast -contrast -sharpen 0x1 output.pdf | |
| convert -density 300 input.pdf -contrast-stretch 15% -sharpen 0x.5 output.pdf | |
| find . -name '*.pdf' -type f -exec convert -density 150 {} -brightness-contrast 5x25 -sharpen 0x.5 {}_new.pdf \; |
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convert -verbose -density 150 input.pdf -brightness-contrast 5x25 -sharpen 0x1 output.pdf
convert -verbose -density 72 input.pdf -colorspace gray -normalize -level 50%,51% -sharpen 0x1 output.pdf
convert -verbose -density 72 input.pdf -colorspace gray -normalize -level 25%,26% -sharpen 0x1 output.pdf
convert -verbose -density 72 input.pdf -colorspace gray -normalize -modulate 150 -sharpen 0x1 output.pdf
convert -verbose -density 72 input.pdf -contrast -contrast -contrast -contrast -sharpen 0x1 output.pdf
convert -verbose -density 72 input.pdf -contrast-stretch 15% -sharpen 0x.5 output.pdf