Photoshop has one marked as bicubic sharper. You can add a small sharpening after the initial resampling. This is an oldie test, there is a chance the programs now make a better result, but do not expect a quantum leap. The normal Photoshop bicubic filter looks simmilar to Lanczos Filter. The programs used (in order of appearance):ġ) Just scaled (this is the so popular "pixelation", the technical name is "nearest neighbour") 2) Irfan view Lanczos Filter They are 1/3 and 1/2 respectively, when they are upscaled they will have a resampled ratio as marked. The reference image is the one marked 100%ī) Next to it there are some smaller marked as 300% and 200%. Reset your browsers zoom so you see them in real size.Ī) In the center are 3 images. Here is a controlled exercise of resampling. The result was ugly, but you could clearly see the licence plate.)ģ) So, the programs use diferent "guess" methods to try to asign information to the new pixels. You have a "information guess" when you upsample it.Ģ) There is no CSI program that perform miracles in the terms you need (However, I have seeing some forensic image processing program that fairly shows a licence plate from a very low resolution image, or from a very narrow angle. In a case of resampling an image there is no "quality" loss, (except if you make mermelade of your own photo, probably compressing it like hell) What you have is information loss when you downsample it. Ok and oldie but goodie question here I go: Some definitions/aclarations:ġ) Quality is a process, is taking care on each step of it.
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