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After making an expense we scan the receipt and upload it here, in the wiki. I (gkaklas) prefer editing the scanned image in GIMP before uploading it so it's more readable and clear of wrinkles, logos etc.

First of all, scan the receipt with your scanner. Don't forget to change the default resolution if necessary, otherwise the receipt will be blurry.

  • Open the image with GIMP
  • Go to Colors->Brightness-Contrast
  • Increase the contrast as much as possible, just before the letters start to fade away
  • After that, I've also found that decreasing the brightness just a little bit helps too
  • Now we have basically removed anything that isn't black (e.g. wrinkles, logos on the back of the paper), so we're left only with the letters; but they're not very crisp
  • Go to Colors->Curves
  • Click and drag the curve around under the line until you like the result
  • This makes the black/grey letters more black

That's it! This is how it looks before and after:

Receipt 2017-09-27-original.png
Receipt 2017-09-27.png


You may also want to do one of the following:

  • Crop the image:
    • Press Shift+C or select the Crop tool from the toolbox.
    • Select the area you want in the picture
    • Adjust the borders of each side by clicking and dragging them
    • Click on the picture to finalize the crop
  • Rotate:
    • Press R or select the Rectangle Select tool from the toolbox.
    • Select the area you want to rotate (as we did with crop)
    • Press Shift+R or select the Rotate tool from the toolbox.
    • Adjust the angle either with the slider or with the input box and up/down arrows
  • Blank a section:
    • Make sure that white is selected as your background color
    • Press R or select the Rectangle Select tool from the toolbox.
    • Select the region you want to blank
    • Press Control+. or select Edit->Fill with BG Color
  • Blur:
    • Press R or select the Rectangle Select tool from the toolbox.
    • Select the region you want to blur
    • Select Filters->Blur->Gaussian Blur
    • Adjust how much blur you want by changing the numbers