Legacy ImageMagick Discussions Archive

For example, green text on a white background:
convert -density 150 test.pdf lecture2.png

convert lecture2.png -alpha Copy -fuzz 100% -fill White -opaque Gray -background Green -alpha Remove lecture3.png

convert lecture3.png lecture3.pdf
I've shown it as three stages, but you could combine them ...

You do not say what resulting image format you want? If you process to pdf, IM will rasterize and then convert that to PDF.

because you want to keep the antialiasing of the text, you should try

convert test.pdf +level-colors red,white result.png (or gif or jpg)


see
http://www.imagemagick.org ...

Hi all

I have a variety of scanned PDFs that are black and white like the following


Many thanks from a massive newbie