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Remove gradient

Mar 19, 2014, 21:29
Post: #1
Remove gradient
Hi.

How I can remove gradient from picture to see text black text on white backgrount ?
I tried to add new reverse gradient, but didnt help ;-/


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.tif  text2.tif (Size: 1.06 MB / Downloads: 186)
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Mar 19, 2014, 22:00
Post: #2
RE: Remove gradient
Thank you very much !
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Mar 19, 2014, 22:04
Post: #3
RE: Remove gradient
I adjusted the Colors->levels.


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.tif  text2copy.tif (Size: 1.41 MB / Downloads: 83)
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Mar 20, 2014, 09:20 (This post was last modified: Mar 20, 2014 11:33 by rich2005.)
Post: #4
RE: Remove gradient
Always interesting to see how many ways you can do these adjustments.
From an HP scanner I think. All that magenta so I wondered what the image looked like in CMYK. Comes out grayscale. (edit: wrote that very badly, should be K channel - black, looks to be best, which was my starting point in Gimp)

Which brings me to:
Change the image mode to grayscale.

[Image: nMOFeSY.jpg]

Use the threshold tool (carefully) to clean it up

[Image: ZlapkPX.jpg]


If planning on OCR-ing this, I would scale it x3 then sharpen with a bit of unsharp mask. However the letters are close together. This a clip from the image.

[Image: B45qGXx.jpg]

Looks worse than it is. I only have an English dictionary for Tesseract, no accented letters.

** https://www.gimp-forum.net/ now answering questions**
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