![]() ![]() This makes it barely better than bilinear. Unfortunately there's a bug in the code when upsizing - rather than taking in an area of 6圆 pixels to calculate the result, it's truncated at 2x2 pixels. This is based on a Lanczos-3 filter, which would ordinarily be a good choice for both downsizing and upsizing. ![]() This means that enlarged images will have unnatural bright or dark halos around edges. In the Mitchell-Netravali paper this is clearly in the Ringing artifact region. Don Mitchell and Arun Netravali wrote a paper that analyzes all the variations and characterizes them using two variables B and C the one used by PIL corresponds to B=0 and C=1. Padding can be added by straightaway supplying the values for the side to be padded. This article depicts how this can be done. An image can be considered content to some container and extra padding can be added to it. There are a number of formulas which can be classified as bicubic, the most common of these being the Catmull-Rom interpolation. Prerequisites: Pillow (python library) Padding is the space between the contents, the container, and the border. I'm not terribly pleased by what I saw.įirst, BICUBIC. I've now gone through the source to figure out the details. I'm leaving it here for those with older versions, although I'd highly advise you to upgrade. The below is no longer valid, it was fixed in Pillow 2.7. ![]() If omitted, or if the image has mode “1” or “P”, it is set (cubic spline interpolation), or (a high-qualityĭownsampling filter). (use nearest neighbour), (linear interpolation), resample – An optional resampling filter. You probably weren't the only one confused by them. The documentation has been changed since the question was asked, and the references to 2x2 or 4x4 have been removed. LANCZOS uses a larger pattern than BICUBIC and should produce slightly sharper results. The following snippet sets the obamaimg image to a width of. You can still use ANTIALIAS in your code for backward compatibility purposes but it's not recommended. Use the resize() method, which takes a 2-tuple of integers representing width and height in pixels. ANTIALIAS is no longer the proper term, it was replaced by LANCZOS which is a more descriptive term for the algorithm used. ![]()
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