help about white-threshold

[dark76]

Hello, sorry for my bad english.
I am using ImageMagick-7.0.8-Q16 on Windows 7 32 bit.

I am a newbie, and probably this is an easy task. I would like to make white the dirty paper scan i did many years ago with old scanner.

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magick convert %1 -selective-blur 0x2+08%% -white-threshold 70%% 2a.jpg

How can i improve the result? I would like that yellow would remain yellow, i tried to play with -white-threshold but changing the values i dont't get much better results. Any idea? I would like to get "uniform colours" if you understand what i mean thx!

[fmw42]

try this:

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convert image.jpg -fuzz 10% -fill white -opaque "rgb(220,200,160)" result.jpg

If on Windows in bat file, then double the % to %%.

Adjust the rgb color to better match the region you want to change to white and/or adjust the fuzz value.

See
https://www.imagemagick.org/Usage/color_basics/#replace
https://www.imagemagick.org/script/comm ... s.php#fuzz
https://www.imagemagick.org/script/comm ... s.php#fill
https://www.imagemagick.org/script/comm ... php#opaque

[dark76]

thx for the help, it works much better. In the end i used this and for the moment i am satisfied

Code: Select all

magick convert %1 -modulate 100,200 -selective-blur 0x2+05%% -fuzz 12%% -fill white -opaque "rgb(250,200,140)" %~n1_fuzzblur.jpg