Remove the artificial dark edge around a translated or rotated white image. #45627

New Issue

Yuting Cui · 2015-07-31T11:19:21+02:00

Yuting Cui commented

2015-07-31 11:19:21 +02:00

Ref D1441

Ref [D1441](https://archive.blender.org/developer/D1441)

Yuting Cui commented

2015-07-31 11:19:21 +02:00

Changed status to: 'Open'

Yuting Cui commented

2015-07-31 11:19:21 +02:00

Added subscriber: @YutingCui

Yuting Cui commented

2015-07-31 11:20:19 +02:00

The bilinear interpolation used in the translation and rotation operator assumes that all the pixels outside an image is (0.0, 0.0, 0.0, 0.0).But this will result in an artificial dark edge when an white image is translated or rotated before a white background.

For example, we move a sRGB white image 0.5 pixels along the y-axis.then the color along the line of x=0 will become (0.216, 0.216, 0.216, 0.502) in the linear color space.When that image is mixed with a white background. the result is a single dark line on an white image.

The patched bilinear interpolation function will use the RGB value of the nearest point on the image when the sample area are not entirely outside the image. And the alpha value is interpolated as before.

The bilinear interpolation used in the translation and rotation operator assumes that all the pixels outside an image is (0.0, 0.0, 0.0, 0.0).But this will result in an artificial dark edge when an white image is translated or rotated before a white background. For example, we move a sRGB white image 0.5 pixels along the y-axis.then the color along the line of x=0 will become (0.216, 0.216, 0.216, 0.502) in the linear color space.When that image is mixed with a white background. the result is a single dark line on an white image. The patched bilinear interpolation function will use the RGB value of the nearest point on the image when the sample area are not entirely outside the image. And the alpha value is interpolated as before.

Julian Eisel commented

2015-07-31 12:05:16 +02:00

Added subscriber: @JulianEisel

Julian Eisel commented

2015-07-31 12:05:16 +02:00

Changed status from 'Open' to: 'Archived'

Julian Eisel closed this issue

2015-07-31 12:05:16 +02:00

Julian Eisel self-assigned this 2015-07-31 12:05:16 +02:00

Julian Eisel commented

2015-07-31 12:05:16 +02:00

No need for an extra task, the patch itself is sufficient :)

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Remove the artificial dark edge around a translated or rotated white image. #45627