Beej's Bit Bucket
a day ago
- Image interlacing allows early display of low-resolution versions during slow rendering or downloads, enabling early user decisions.
- Multiple image formats (GIF, JPEG, PNG) support interlacing with different methods, such as JPEG's progressive mode and PNG's Adam7.
- Custom interlacing can be implemented for mathematical image generation (e.g., ray-tracing) to show progress and allow aborting long renders.
- Different interlacing techniques vary in pass count and data usage; for example, Y halving provides a useful image at 6-12% data, while XY halving achieves it at 2-6%.
- Adam7 interlacing balances early image visibility with multiple bail-out points, offering intermediate passes for incremental improvements.