Genuine Fractals is perhaps the most common iterative (or fractal) enlargement software. *default interpolation algorithm for Adobe Photoshop CS and CS2 **still in research phase, not available to public
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Unfortunately, these often require more processing time and are usually more expensive.Įven the most basic non-adaptive methods do quite well at preserving smooth tonal gradations, but they all begin to show their limitations when they try to interpolate near a sharp edge. This flexibility gives much sharper images with fewer artifacts (than would be possible with a non-adaptive method). Recall that adaptive (edge-detecting) algorithms do not treat all pixels equally, but instead adapt depending on nearby image content. Nearest neighbor and bilinear are not computationally intensive, and can thus be used for things like web zooming or handheld devices. Lanczos and bicubic are some of the most common, perhaps because they are very mild in their choice of all three artifacts (as evidenced by being towards the middle of the triangle above). All show some degree of aliasing, however one could always eliminate aliasing entirely by blurring the image in Photoshop (#7). Lanczos is very similar to Photoshop bicubic and bicubic sharper, except perhaps a bit more aliased. You will see that edge sharpness gradually increases from 3-5, but at the expense of both increased aliasing and edge halos.
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Nearest neighbor is the most aliased, and along with bilinear these are the only two that have no halo artifacts - just a different balance of aliasing and blur. The qualitative diagram to the right roughly demonstrates the trade-offs of each type.