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Old 05-10-2012, 09:40 AM   #7
Jellby
frumious Bandersnatch
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Posts: 6,199
Karma: 4800739
Join Date: Jan 2008
Location: Spaniard in Sweden
Device: Cybook Orizon, Kobo Aura
When i want to make sure the background is really white, after converting to grayscale (Image -> Mode -> Grayscale):

1. I create a new black layer on top of the image.
2. I set the layer mode to blacken (not darken): everything that's not pure white in the bottom layer appears black.
3. I set the black layer opacity to ~50%
4. I apply the Levels command to the bottom layer (move the white level until most background is white, without losing detail in the picture).
5. I delete (paint white) all remaining speckles in the background (making sure I paint on the bottom layer, not on the black layer).
6. I delete (or hide) the black layer.
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