A 2K image is a 2K image is a 2K image, right? Depends. One 2K image may appear better in quality than another 2K image. For instance, you have a 1.85 frame scanned on a Spirit DataCine at its supposed 2K resolution. What the DataCine really does is scan 1714 pixels across the Academy frame (1920 from perf to perf), then digitally up-res it to 1828 pixels, which is the Cineon Academy camera aperture width (or 2048 if scanning from perf to perf, including soundtrack area). The bad news is, you started out with somewhat less image information, only 1714 pixels, and ignored 114 useful image pixels, instead re-creating them to flesh the resolution out to 1828. You know how re-creations, though similar, are not the real thing? That applies here. Scan that same frame on another scanner with the capability of scanning at 1828, 1920 or even 2048 pixels across the Academy aperture, and you would have a digital image with more initial information to work with. Now take that same frame and scan it on a new 4K Spirit at 4K resolution, 3656x2664 over Academy aperture, then downsize to an 1828x1332 2K file. Sure, the end resolution of the 4K-originated file is the same as the 2K-originated file, but the image from 4K origination looks better to the discerning eye. The 4096x3112 resolution file contains a tremendous amount of extra image information from which to downsample to 1828x1332. That has the same effect as oversampling does in audio.
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