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How can I make black colour tone pixels completely black. I want to make this on whole raster. I want to do this in Gimp.

graphics sample

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    Perhaps you could try Burn tool with Range: Highlights – Joonas Dec 16 '15 at 19:33
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    You can also select by color, sharpen the selection (Select -> Sharpen), fill the whole area. – Paolo Gibellini Dec 16 '15 at 23:10
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If this is not solved yet, use the Threshold tool in Colors tab. Adjust slider to achieve desired result.

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