2021منتدى General Discussion
Calculating resolution after cropping anamorphic 4K footage to a specific aspect ratio
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- When shooting anamorphic on digital cameras, the desqueeze factor (typically 2x for standard anamorphic lenses) must be applied to the vertical resolution before calculating the final crop dimensions.
- 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.
يعتمد على
- 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.