2021Forum General Discussion
Berechnung der Auflösung nach dem Zuschneiden von anamorphem 4K-Material zu einem bestimmten Seitenverhältnis
Was die Diskussion ergab
- Bei anamorphen Aufnahmen auf Digitalkameras muss der Desqueeze-Faktor (normalerweise 2x für anamorphe Standardobjektive) auf die vertikale Auflösung angewendet werden, bevor die endgültigen Ernteabmessungen berechnet werden.
- To achieve a target aspect ratio after anamorphic desqueeze, multiply the new vertical resolution by the desired aspect ratio to determine required horizontal pixels, then crop the excess from the sides.
- Anamorphic shooting compresses horizontal information into the frame; during desqueeze, doubling the horizontal pixels does not create additional image information or improve resolution beyond the original capture.
- The calculation requires knowing the exact pixel dimensions of the capture format and the squeeze factor of the specific anamorphic lenses used, as different lens ratios (2x, 1.8x, 1.5x) produce different results.
- When full-frame anamorphic coverage is not achievable with certain lens ratios, unused pixels must be cropped on both axes to achieve proper coverage before applying the aspect ratio crop.
Hängt ab von
- The discussion references Sony Venice camera capabilities but also mentions Orion Atlas, indicating specifics may vary by equipment.
- Standard 4K definitions (UHD at 3840x2160 or DCI at 4096x2160) do not natively support 4:3 aspect ratio, requiring clarification of actual capture format.
- The exact resolution outcome depends on the specific anamorphic lens squeeze factor being used, which was not finalized in the thread.
- No consensus on whether 2.1:1 or 2.4:1 was the intended final aspect ratio.