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Whenever I export photos I add in a small watermark on the edge of the photo. I usually add in a white watermark which is slightly transparent. However, Some photos are entirely white in that edge, which means the watermark entirely disappears. In these situations, I would want to add in a dark watermark (same transparency level, but different color).

Is there any software that can achieve this automatically without my having to choose this manually? I envision the way it would work is by investigating the pixels underneath where the watermark goes, and then determining whether black or white text would fare better. I tried perusing imagemagick's options, but it seems like there is no such functionality. Lightroom also doesn't have this functionality.

I'd prefer macOS and a utility which is free. However, I'm open to other suggestions — at least I want to know if something like this even exists

  • Sounds like an easy job for photoshop or the free and open source GIMP. – Hector Albion Aug 4 at 1:08
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    But do they have a way to automatically add a dark/light watermark, based on the pixels that the watermark would be applied to? – Skeleton Bow Aug 4 at 13:47
  • This could likely be done with imagemagick; however that isn't particularly user-friendly. – wilkgr Aug 6 at 0:57

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