i have some scanned images which i want to turn into black and white to print it so as i dont get greyed parts
so is there any software in manjaro that can do this to a single image or a pdf file?
in windows i was using: Convert images to monochrome in PDF files. [A-PDF.com]
Maybe this. It does have greyscale but MIGHT have what you are looking for;
Install imagemagick
sudo pacman -Syu imagemagick
Do the conversion
convert somepdf.pdf -monochrome bwpdf.pdf
You could scriptify it too.
A quick single line example of converting all files in the current directory to black and white;
(after first dropping all files in, example directory ~/convertpdfs, so cd ~/convertpdfs then)
for f in * ; do convert "$f" -monochrome "bw-${f}" ; done
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Krita has a simple menu option to achieve the required result.
Once an image or PDF file is loaded, simply choose from the toolbar:
- Image → Convert Image Colour Space
…and select: - Model → Greyscale/Alpha
Additionally, if the gmic-qt package is also installed, you have access to a host of filters via:
- Filter → G’MIC-Qt
A fair selection to choose from under the ‘Black & White’ category:
sudo pacman -S krita
I hope this helps. Cheers.
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Try loading your image in Gimp.
Context menu, Filters>Distort>Newsprint
Adjust
Zoomed out, the image looks good - but without actually printing grey areas.
I show here the ‘dot’ pattern, but actually for a larger image where you shouldn’t see the marks - the line pattern is actually very good in it’s appearance.
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I tuned this and figured out, that (PDF) input should be in at least 300 ppi to get satisfying results.
To get better compression, the Fax or Group4 option are best for monochrome. Threshold 66% was a good choice to have colorful font in acceptable contrast included as well.
magick -density 300 input.pdf -threshold 66% -monochrome -strip -compress Fax output.pdf