Python / Pillow: How to scale an image
image-scaling, python, python-imaging-library
Solution
Noo need to reinvent the wheel, there is the `Image.thumbnail` method available for this:
maxsize = (1028, 1028)
image.thumbnail(maxsize, PIL.Image.ANTIALIAS)
Ensures the resulting size is not bigger than the given bounds while maintains the aspect ratio.
Specifying `PIL.Image.ANTIALIAS` applies a high-quality downsampling filter for better resize result, you probably want that too.
Problem
Suppose I have an image which is 2322px x 4128px. How do I scale it so that both the width and height are both less than 1028px? I won't be able to use `Image.resize` since that requires me to give both the new width and height. What I plan to do is (pseudo code below): ``` if (image.width or image.height) > 1028: if image.width > image.height: tn_image = image.scale(make width of image 1028) # since the height is less than the width and I am scaling the image # and making the width less than 1028px, the height will surely be # less than 1028px else: #image's height is greater than it's width tn_image = image.scale(make height of image 1028) ``` I am guessing I need to use `Image.thumbnail`, but according to this example and this answer, both the width and the height are provided in order to create the thumbnail. Is there any function which takes either the new width or the new height (not both) and scales the entire image?