Here is a thumbnail of a picture of a whiteboarding session taken with my iPhone. It’s basically unreadable. I looked for a good recipe to clean this up in gimp, but the googles failed me.
After playing with a bunch of stuff with the gimp, here are the steps that I’ve found to work pretty well:
- Load the image in gimp
- Now for the magicks: Choose Filters >Edge Detect > Difference of Gaussians…
- Start with these settings. It doesn’t make it perfect, but it should make the lines stand out much better. Play around with the radius 1 and radius 2 values if you aren’t happy. Radius 1 needs to be bigger than Radius 2. Click OK.
Return to Colors > Levels… and move both the blackpoint and the midpoint to the right (to make the lines stand out) and the whitepoint to the left just a bit (to make the whiteboard white). Click OK.
Here’s the result:
Related posts:
- 50,000 photos in iPhoto on a shared laptop and external drive
I’ve got over 100GiB of photos (JPEG and RAW) taken over the years, and they don’t comfortably fit on a laptop. The laptop is also shared by everyone in my......