If you need to do OCR instead of just parsing the text from the logs then you should get an OCR program that does not require B/W images. You generally get much better results if you OCR greyscale (or even color). I never had good results trying B/W scans because characters are fuzzy with the extreme contrast.
Otherwise I would agree, make it white on black, if necessary for grey/yellow text increase the contrast a bit and then invert the image (you OCR should have that option anyway).
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