Image transforming recipes in Pillow


Martin McBride, 2020-10-18
Tags image processing recipes
Categories pillow

These ImageOps functions provide methods to transform images.

Each function accepts an input image and returns a transformed image.

flip

flip flips and image vertically:

The code to do this is:

im = Image.open('carousel-small.jpg')
im = ImageOps.flip(im)
im.save('imageops-flip.jpg')

mirror

mirror flips and image horizontally:

The code to do this is:

im = Image.open('carousel-small.jpg')
im = ImageOps.mirror(im)
im.save('imageops-mirror.jpg')

exif-transpose

EXIF is a special type of metadata that can be attached to an image, usually by a camera. It gives details of how the image was obtained (camera model, exposure settings, time and location etc). One setting is the Orientation tag, which typically indicates if the shot was taken in landscape view, or with the camera turned on its side in portrait view.

A typical problem with camera images is portrait mode is that, when they are opened on a computer, they are in landsacpe view (with the subject rotated by 90 degrees).

exif-transpose reads the Orientation tag (if it is present), and rotates the image so that it appears in the correct orientation:

im = Image.open('carousel-small.jpg')
im = ImageOps.exif_transpose(im)
im.save('imageops-exif_transpose.jpg')

If there is no tag present, a copy of the original image is returned.

If this function is applied to a set of images, it will automatically rotate just the images that need rotating.

If you found this article useful, you might be interested in the book Image Processing in Python or other books by the same author.

Prev

Popular tags

2d arrays abstract data type alignment and angle animation arc array arrays bar chart bar style behavioural pattern bezier curve built-in function callable object chain circle classes clipping close closure cmyk colour combinations comparison operator comprehension context context manager conversion count creational pattern data science data types decorator design pattern device space dictionary drawing duck typing efficiency ellipse else encryption enumerate fill filter font font style for loop function function composition function plot functools game development generativepy tutorial generator geometry gif global variable gradient greyscale higher order function hsl html image image processing imagesurface immutable object in operator index inner function input installing iter iterable iterator itertools join l system lambda function len lerp line line plot line style linear gradient linspace list list comprehension logical operator lru_cache magic method mandelbrot mandelbrot set map marker style matplotlib monad mutability named parameter numeric python numpy object open operator optimisation optional parameter or pandas partial application path pattern permutations pie chart polygon positional parameter print pure function python standard library radial gradient range recipes rectangle recursion reduce regular polygon repeat rgb rotation roundrect scaling scatter plot scipy sector segment sequence setup shape singleton slice slicing sound spirograph sprite square str stream string stroke structural pattern subpath symmetric encryption template text text metrics tinkerbell fractal transform translation transparency triangle truthy value tuple turtle unpacking user space vectorisation webserver website while loop zip