- Direct Path (no re-draw)
- With no background fill and no resize, the PNG comes straight from the decoder with no canvas round trip.
- Lossless Optimisation Effort (1 - 6)
- How hard the optimiser works to shrink the PNG. Higher takes longer. Pixels are identical at every level.
- Background Mode
- Keep transparency, or flatten onto white, black or a custom hex colour. Flattening is permanent and needs a canvas pass.
- Custom Dimensions
- Optionally scale iPhone photo dimensions during conversion.