Pauli's software -> Terragen resources -> Tips and Tutorials -> Anti-aliasing p.[1] [2] | 19. 11. 2004 |
This page compares different resampling methods: bi-linear, bi-cubic and spline interpolation.
- The same image has been rendered in three sizes: 512 x 512, 600 x 600 and 1024 x 1024, without antialiasing.
- Each image is then resampled to size 256 x 256 with the three resampling methods above.
Click "Normal size" link to see the images in normal size. (This does not download new images, just zooms the existing ones.)
Normal size - Zoom 2x
Linear interpolation | Bi-cubic interpolation | Spline interpolation | |
Rendered size 512 x 512 |
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Rendered size 600 x 600 |
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Rendered size 1024 x 1024 |
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Linear interpolation clearly gives the best results. The higher degree interpolation methods actually increase the aliasing. Bi-cubic is the worst. More advanced Spline method gives somewhat better results, but is still worse than linear interpolation. When reducing the image size, linear interpolation is the best method. Higher degree methods (bi-cubic, spline, Bell filter etc.) are best used when increasing the image size.
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