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DownRez. Drop-down list: None, By 1/2, By 1/4. Causes the image from disk to be reduced in resolution by the specified amount, saving RAM and time for large film images, but reducing accuracy as well.
Interpolation. Drop-down list. Bi-Linear, 2-Lanczos, 3-Lanczos, 2-Mitchell. The bi-linear method is fastest but softens the image slightly. If the shot has a lot of noise, that can be a good thing. The 2-Lanczos filter provides a sharper result, after a longer time. The 3-Lanczos filter is even sharper, with more time and of course the noise is made sharper also. 2-Mitchell is between bi-linear and 2-Lanczos in sharpness.
Channel. Drop-down list: RGB, Luma, R, G, B, A. Allows a luminance image to be used for tracking, or an individual channel such as red or green. Blue is usually noisy, alpha is only for spot-checking the incoming alpha. This can reduce memory consumption by a factor of 3.
Invert. Checkbox. Inverts the RGB image or channel to improve feature visibility.
Channel Depths: Process. 8-bit/16-bit/Half/Float. Radio buttons. Selects the bit depth used while processing images in the image preprocessor. Same controls as on Shot Setup dialog
Channel Depths: Store. 8-bit/16-bit/Half/Float. Radio buttons. Selects the bit depth used to store images, after preprocessing. You may wish to process as floats then store as Halfs, for example.
+Alpha. Button. Click this to add a separate alpha image sequence to the shot. Click the button, cancel the file selector, then answer Yes to remove the alpha sequence. Button is blue when a sequence has been explicitly selected. Note that sequences can also be attached implicitly, if their names match the Separate-alpha suffix preference.
Keep Alpha . Checkbox. Requests that SynthEyes read and store the alpha channel (always 8-bit) even if SynthEyes will not use it itself—typically so that it can be saved with the preprocessed version of the sequence. Alpha data can be in the RGB files, ie RGBA, or in separate alpha-channel files, see Separate Alpha Channels.
Mirror Left/Right. Checkbox. Mirror-reverse the image left and right (for some stereo rigs).
Mirror Top/Bottom. Checkbox. Mirror-reverse the image top and bottom (for some stereo rigs).
360 VR. Dropdown. This is the same control as on the Shot Settings panel; it controls 360 VR processing, with modes indicating that the shot is 360 VR or not, and also for changing 360 VR to non-VR and back.
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