Yes, you’re doubt compressing.
Honestly, there’s not a huge different in the range of 85% - 100% on the initial export. So not really a problem when the rendition gets compressed again from Backlight generating renditions.
But at 60%, that’s a huge loss. We’re then compressing an image that’s already been significantly compressed.
For comparison, my own flow is this:
- export from Capture One Pro: 2048px @ 95%
- run images through JPEGmini for optimization
- upload images to Backlight, for display at 1024px
I haven’t put a great deal of thought into that 95% value, but the rest of it is very intentional, and I am generally pleased with my file sizes and my image fidelity.
Also, if you have any feedback on Kookaburra, I’d love to hear it. Probably in a separate thread. Check out the Kookaburra Roadmap thread, if you haven’t already seen it.