How to change scanned document's background color?
I scanned a document in, it's now in PDF format, I need to print it, but the background color is yellow, I need it to be white, is there a way to change it?
You could re-scan the document, and save it as a .tif file. Then open it up in a photo editing program, like Photoshop. Convert the picture to 8-bit grayscale. Then use the brightness and contrast tools, to make the grey background white, without making the text washed out, or lose detail. You want to brighten just the upper range (light grey to white), without making the black text any brighter.
You may also have to use the gamma tool, which blackens the mid to low grey tones. A little experimentation is in order. After you've gotten the right look, you should save it as a .jpg file, then print that.
Use photoshop or gimp. The method described by timorous is probably the easiest though it requires at most an hour especially if you don't have any experience in using graphic-editing tools. Try to search for a much detailed tutorial on the web and pick those with pictures so you can follow through with ease.
Thank you very much to both of you! I actually tried the contrast on regular Word program instead of Photoshop, and it worked just perfectly, thank you!!!
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