Adding Noise

After viewing the images in the previous post on several computer monitors with varying brightness and contrast levels, I found that the “edges” of the galaxies were clearly visible on some displays. Adding noise to the images seems to help fix the issue. Tweaking the brightness and gamma settings in GSnap’s parameter file can produce nice images for a specific display, but without noise, the image quality is less consistent on other displays.

Here are some “noise-enhanced” images. The noise was added using GIMP’s RGB noise filter. I tried using ImageMagick’s noise generators, but they didn’t produce the desired result. As an alternative to adding noise, I could also use a background image that already includes some noise. It would be straightforward for GSnap to load a background image and paint on top of it instead of starting with a blank canvas.

3 Responses to “Adding Noise”

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