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B&W conversion preprocessing

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B&W conversion preprocessing gordom 07 Feb 14:26
2020-02-07 14:26:15 UTC (8 months ago)
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B&W conversion preprocessing

Hello everyone.
I have a whole bench of files which I need to process. Here you have a sample of such file (see test_1 sample file). I would like to replace the whole brownish background with white colour leaving black lines and objects only (eventually these files will be exported to B&W bmp). For example black dots in upper left corner should be left untouched while dots in lower left corner should vanish (see test_1 file). Right now, if I convert this graphic to B&W with no dithering, some dark brownish objects are left and being converted into black, which is unwanted.

Because the task will be regularly repeated on dozens of files, it should be accomplished as much automatic as possible, without need of using any "manual" tools (for example select tool)

As a result I would like to get something like result test_2 file.

Is it possible and how if yes? Any help will be appreciated. Kind regards, gordom

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