5x7 Flat Card:
- Resize sample JPEG to 722x1000
- 1px centered black stroke
- Center on a white 2048x1092 canvas
- Export as JPEG 85, progressive-scan (3 scans)
7x5 Flat Card:
- Resize sample JPEG to 1386x1000
- 1px centered black stroke
- Center on a white 2048x1092 canvas
- Export as JPEG 85, progressive-scan (3 scans)