LANCZOS uses a larger pattern than BICUBIC and should produce slightly sharper results. Some algorithms may look better for images with sharp contrast lines, others may work better for natural scenes. Find centralized, trusted content and collaborate around the technologies you use most. When was the earliest appearance of Empirical Cumulative Distribution Plots? Just do some google searching. You can still use ANTIALIAS in your code for backward compatibility purposes but it's not recommended. This makes it barely better than bilinear. Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition. If you're only doing 5 images, go for quality. LANCZOS uses a larger pattern than BICUBIC and should produce slightly sharper results. Thanks for the link to the release notes. You probably weren't the only one confused by them. Not the answer you're looking for? I am also confused about the linear interpolation in a 2x2 environment and cubic spline interpolation in a 4x4 environment in the document. Making statements based on opinion; back them up with references or personal experience. In the end though, it comes down to what looks better to you. in some of my test case, bicubic is the best. Next up is ANTIALIAS. The problem is that while "bicubic" is a well defined algorithm, "antialias" is not. According to the document below, ANTIALIAS seems to be the best while scaling down. Asking for help, clarification, or responding to other answers. They address every issue I found. How do I delete a file or folder in Python? Is the portrayal of people of color in Enola Holmes movies historically accurate? What is the meaning of to fight a Catch-22 is to accept it? 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. How to resize image if max_width exceeds x with PIL? What does 'levee' mean in the Three Musketeers? There is a lot of blog posts and other things out there on which algorithms work best for which types of images. Wow. It really depends on what you're using it for. First, BICUBIC. The documentation has been changed since the question was asked, and the references to 2x2 or 4x4 have been removed. How to dare to whistle or to hum in public? Manually raising (throwing) an exception in Python. You can still use ANTIALIAS in your code for backward compatibility purposes but it's not recommended. It will also be slower. To learn more, see our tips on writing great answers. (some of my test case shows bicubic is better choice). @user666 that's good news! I've always known PIL was a little messed up, but I didn't realize how much until looking at the code. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What was the last Mac in the obelisk form factor? I am confused about the algorithm used with `resample=ANTIALIAS'. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @GordonWrigley No and no. It's impossible to find a blog post which will define the difference. Is atmospheric nitrogen chemically necessary for life? That's not what PIL uses. This means that enlarged images will have unnatural bright or dark halos around edges. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It will also be slower. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. And for instance use: import cv2 import numpy as np img = cv2.imread('your_image.jpg') res = cv2.resize(img, dsize=(54, 140), interpolation=cv2.INTER_CUBIC) Here img is thus a numpy array containing the original image, whereas res is a numpy array containing the . How can I fit equations with numbering into a table? How do I access environment variables in Python? There will be visual differences between them. If you're doing 100,000 images, maybe go for speed. I suspect with active development on Pillow that things have improved. The algorithm used by PIL is probably well known, just not by that name. You'll have to decide what matters more to you, speed, or quality. Stack Overflow for Teams is moving to its own domain! Can anyone give me a rationale for working in academia in developing countries? I am using PIL to resize my images, my case is to scale up the original image. I've never tried to dig into the source to figure it out for myself though. I'm leaving it here for those with older versions, although I'd highly advise you to upgrade. 505), Python PIL: best scaling method that preserves lines. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. pillow.readthedocs.io/en/3.0.x/releasenotes/2.7.0.html, Speeding software innovation with low-code/no-code tools, Tips and tricks for succeeding as a developer emigrating to Japan (Ep. Shrinkwrap modifier leaving small gaps when applied. Does Python have a ternary conditional operator? The below is no longer valid, it was fixed in Pillow 2.7. Thanks for contributing an answer to Stack Overflow! rev2022.11.16.43035. Unfortunately there's a bug in the code when upsizing - rather than taking in an area of 6x6 pixels to calculate the result, it's truncated at 2x2 pixels. The 2x2 and 4x4 environment means that the algorithm looks at a 2x2 or 4x4 area of pixels. ANTIALIAS is no longer the proper term, it was replaced by LANCZOS which is a more descriptive term for the algorithm used. and regardless do you happen to know if they are still issues? Connect and share knowledge within a single location that is structured and easy to search. Is `0.0.0.0/1` a valid IP address? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I concatenate two lists in Python? ANTIALIAS vs BICUBIC in PIL(Python Image Library)? How did the notion of rigour in Euclids time differ from that in the 1920 revolution of Math? Why does de Villefort ask for a letter from Salvieux and not Saint-Mran? How does a Baptist church handle a believer who was already baptized as an infant and confirmed as a youth? These are listed in order of lowest to higest complexity. can u explain that? How can I make combination weapons widespread in my world? Why do paratroopers not get sucked out of their aircraft when the bay door opens? Yeah, you can install opencv (this is a library used for image processing, and computer vision), and use the cv2.resize function. There are a number of formulas which can be classified as bicubic, the most common of these being the Catmull-Rom interpolation. I'll try to do a full investigation later. What does it mean here? Does Python have a string 'contains' substring method? I wonder In which case can BICUBIC win? The main difference will be how long the algorithm takes to execute. This is based on a Lanczos-3 filter, which would ordinarily be a good choice for both downsizing and upsizing. Remove symbols from text with field calculator. What do you do in order to drag out lectures? Did you report theses issues to PIL? If so, what does it indicate? ANTIALIAS is no longer the proper term, it was replaced by LANCZOS which is a more descriptive term for the algorithm used. They all have their strengths and weaknesses, it really depends on the source image. 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