VSE: Improve image filtering defaults/options #116980
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Reference: blender/blender#116980
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Currently, image/movie content in sequencer can be transformed by using the per-strip transform options, or using the Transform Effect strip. They have these filtering options:
Several problems with the current situation:
Proposed Improvements
Autofilter option to strips, and (for new files / new strips) default to that. Which would have logic perhaps like (actual details TBD):Notes on which filters should be presented as choices at all:
NearestandBilinearalready exist, are simple to understand, they stay.Bicubic(right now only exists in Transform Effect) should stay. Add it as option for regular strips (done: #117100). Perhaps clarify that it is a "B-Spline" bicubic variety.Mitchellbicubic option (at least to VSE/Compositor).Subsampled 3x3that exists today is really just a special case of Box filter for 3x scaling down. It should be extended to handle arbitrary downscaling ratios, and perhaps renamed toBox.Somewhat related question: when scaling up,
Bilineartoday results in an edge of transparency around the image. This is mostly visible when using large upscaling ratios. Need to decide if this is wanted behavior, or whether it should be changed somehow.An interactive "playground" of various image upscaling filtering algorithms: https://aras-p.info/img/misc/upsample_filter_comp_2024/
Work items
VSE preview option for picking performance vs qualityConsidering this "done" for now (i.e. for 4.1). Did not add the "VSE preview option for picking performance vs quality" option, since so far haven't found a convincing use case that the option is needed.