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WIP: VSE: bilinear upscaling no longer adds transparent border around the image #117279

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Aras Pranckevicius wants to merge 1 commits from aras_p/blender:interp_bilinear_clamp into main
pull from: aras_p/blender:interp_bilinear_clamp
merge into: blender:main

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Aras Pranckevicius commented 2024-01-18 13:45:52 +01:00
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The code is actually within BLI, but it is mostly used by VSE (and somewhat by Compositor). Ever since low level "bilinear/bicubic" interpolation functions were added back in 2007 (9298357670), they had different behavior in how a pixel that is right on the edge of an image is treated: bilinear was blending in transparent black, whereas bicubic was clamping samples to the image edge.

Make bilinear do the same as bicubic does, which is clamping samples to the edge of an image. For typical use cases this better matches user expectations: they put in low resolution image into say sequencer, it is upscaled, and the whole image covers the whole output, without any transparency appearing aroud the edges.

Performance of bilinear filter (measuring IMB_transform on 4K image) seems to be unchanged.

Here's throwing in an image into a VSE that is 6x larger resolution: note that black outline appears around the edges.

And here's the same with this PR:

The code is actually within BLI, but it is mostly used by VSE (and somewhat by Compositor). Ever since low level "bilinear/bicubic" interpolation functions were added back in 2007 (9298357670f5), they had different behavior in how a pixel that is right on the edge of an image is treated: bilinear was blending in transparent black, whereas bicubic was clamping samples to the image edge. Make bilinear do the same as bicubic does, which is clamping samples to the edge of an image. For typical use cases this better matches user expectations: they put in low resolution image into say sequencer, it is upscaled, and the whole image covers the whole output, without any transparency appearing aroud the edges. Performance of bilinear filter (measuring IMB_transform on 4K image) seems to be unchanged. Here's throwing in an image into a VSE that is 6x larger resolution: note that black outline appears around the edges. ![](/attachments/c48f2d77-d381-4223-bbdc-8ee19ff0c417) And here's the same with this PR: ![](/attachments/ec431c42-9acc-4aa0-a8d3-d91b5d871a68)
einar_06_blender_bilinear_fixed.png
630 KiB
einar_06_blender_bilinear.png
505 KiB
Aras Pranckevicius added 1 commit 2024-01-18 13:46:02 +01:00
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baf672bd78 VSE: bilinear upscaling no longer adds transparent border around the image 
The code is actually within BLI, but it is mostly used by VSE (and
somewhat by Compositor). Ever since low level "bilinear/bicubic"
interpolation functions were added back in 2007 (9298357670), they
had different behavior in how a pixel that is right on the edge
of an image is treated: bilinear was blending in transparent black,
whereas bicubic was clamping samples to the image edge.

Make bilinear do the same as bicubic does, which is clamping samples
to the edge of an image. For typical use cases this better matches
user expectations: they put in low resolution image into say
sequencer, it is upscaled, and the whole image covers the whole output,
without any transparency appearing aroud the edges.

Performance of bilinear filter (measuring IMB_transform on 4K image)
seems to be unchanged.
Aras Pranckevicius commented 2024-01-18 13:46:47 +01:00
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@blender-bot build

@blender-bot build
Aras Pranckevicius commented 2024-02-01 11:43:36 +01:00
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Replaced by #117717

Replaced by #117717
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