11-01-2021, 10:49 AM
When you downscale, patterns that are close to the sale factor (for instance a 4px repeating pattern when you scale down by 4.05x) can produce aliasing. Such patterns will also include slightly slanted lines.
A counter-intuitive way to reduce aliasing is to blur the image before scaling down, to remove the high frequency components that will anyway not be visible in the final image.
A counter-intuitive way to reduce aliasing is to blur the image before scaling down, to remove the high frequency components that will anyway not be visible in the final image.