Image modification help
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Hi,
My girlfriend's younger brother told he can make images of a book. His solution wasn't professional, he took photographs of the pages. Also he has used flashlight.
I'd need a software capable of eliminating the effects of the flashlight, I want pages with uniform white background. Now the middle of the picture is very bright, the edges of the picture are grayish.
I'd need a mask which to undo this, brightening edges and darkening the center (a point I can specify, I guess). The pages contain a certain color code, so color information is important to keep, but color depth or saturation isn't that important.
I'd prefer something easy to use and easy to get, because I have very little time to spare at the moment. That's why I'm asking here. :)
It's like 40 pictures, so if there is a solution to do the same thing with all on one click, it would be even better.And no, I don't need smart suggestions as avoid using flash on a white page or use a scanner instead. I no longer have the source.
Thanks, people
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Sorry, but that doesn't really exist.
To an extent, it could be done using something like photoshop, but there is no 'one click' solution to this problem. The image only has so much data, and the contrast between the black text (or colour images) and the colour of the page, which will fade incrementally from the lightest to darkest points, changes at an undefined rate.
It would be hard to find a one click solution to do just one image, never mind fourty taken by hand.
If you don't mind the images not being perfect white paper, then you will be able to do it, with much time and effort using any image processing software. If you spend several days, you could get it perfect, but it would need a lot of hand fixed areas and elements.
if it was just black text on white paper, you could get close by ramping up the contrast, and then masking out the dodgy areas towards the edges, but you said there is colour information, so your out of luck really.
I know you said you didn't want this kind of answer, but its the only one there is, really.
You could try
G.I.M.P.
Its free. But it will be a ball ache.
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It was the kind of answer I was expecting, thanks. (funny that it was your username which gave me the idea to ask here reading the forums, and then you suggest the software I was thinking on. :) )
The color information consists of like 8 colors, so don't think on 64bit color depth. (it's geometrical forms colored with uniform colors)
I don't really care how red red stays. If it stays reddish and clearly distinguishable from other colors I'm fine with it. It don't have to be pretty.
Does it change anything?(however, I don't think this situation is terribly unique. A flashlight used on flat surface which caused circle shaped anomalies. Sounds pretty usual to me.)
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sounds like you need photoshop. if all 40 images are the same and need the same corrections, you could ajust the first one while recording your action then runing the action on the rest. You need to know some photoshop though.
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At http://www.squicky.org/work/sig08lme/ there's some impressive results, although I don't think theres a practical way for you to do that.
You might get some results by dividing each page up into smallish squares and re-do the white balance independently for each sub-picture. Of course this would be to much work to do by hand, but there might be scripts there already to do this for you.