Quote:
Originally Posted by mr ploppy
You might mean bitmapping, where it changes it to pure black and white (2 colours)? That would definitely need an increase in resolution for it to work, but for normal greyscale increasing the resolution would only increase the blockiness of any text.
|
Yes, SK has selection for "binarization" algorithm and thresshold but there is more to it. The way I understand it, SK uses data in grayscale to extrapolate pixels for binarization and increased dpi. So, it is not just some dumb grayscale to B/W. When the conversion (300 dpi grayscale to 600 dpi B/W) is done, the "blockiness" of the text is reduced, not increased while blurry text becomes sharp.
It seems like magic, when the text that is in the shadow (say close to the spine), appears clear without a shadow and in increased resolution.
===
I also saw very good results from people processing scans through Corel PaintShop Pro but it is beyond my skills/abilities. They practically separated the text layer from the background layer.