TIMELINE ?: What are the black "photo corners" in the frame number layer?

Screen Shot 2024-10-09 at 3.48.46 PM

I can’t seem to find anything that explains what the black photo corners are in the frame number layer. I thought it might be a playback selection, much like video editing apps, but they don’t seem to affect the playback.

Anyway: When the mouse hovers at the top of the frame numbers, the cursor transforms into a double-side arrow. If you click and slide right or left with this arrow, you can stretch or compress the bounding box created by the four black triangle corners — they look like photo corners (for an old-fashioned photo album).

What is this selection for? What’s it called? It’s not stopping my workflow right now; just an itch I need to scratch. I’m new to Aseprite and read the website documentation and watched tutorials. Thank you!

afaik, the brackets adjust the frames displayed by the onion skin if the onion skin is toggled on. See tip 11:

If you don’t see all the frames within these brackets, then adjust the opacity and opacity step in the timeline options menu. If the step is so high, or the initial opacity so low, then an onion skin frame may have zero alpha.

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Hey Jeremy, thanks for this! Much appreciated.