Thanks so much for your tips & work, this is just the sort of softly-softly approach I was looking for.
No worries, I can set up that as a batch in Photoshop if you can't get anything sorted in GIMP
@branwen started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Thanks so much for your tips & work, this is just the sort of softly-softly approach I was looking for.