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Algorithms suitable for downscaling. More...
Functions | |
| template<typename ImageView > | |
| void | scale_lanczos (ImageView input_view, ImageView output_view, std::ptrdiff_t a) |
| Complete Lanczos algorithm. | |
Algorithms suitable for downscaling.
These algorithms provide best results when used for downscaling. Using for upscaling will probably provide less than good results.
a single step of lanczos downscaling
Use this algorithm to scale down source image into a smaller image with reasonable quality. Do note that having a look at the output once is a good idea, since it might have ringing artifacts.
| void scale_lanczos | ( | ImageView | input_view, |
| ImageView | output_view, | ||
| std::ptrdiff_t | a | ||
| ) |
Complete Lanczos algorithm.
This algorithm does full pass over resulting image and convolves pixels from original image. Do note that it might be a good idea to have a look at test output as there might be ringing artifacts. Based on wikipedia article: https://en.wikipedia.org/wiki/Lanczos_resampling with standardinzed cardinal sin (sinc)
