It's interesting that if you google some of the language in this post, you find that it is just paraphrased form more popular tutorials: A crucial class in the Python Imaging Library is the Image class. It is defined in the Image module and provides a PIL image on which manipulation operations can be carried out. An instance of this class can be created in several ways: by loading images from a file, creating images from scratch or as a result of processing other images. We'll see all these in use. To load an image from a file, we use the open() function in the Image module passing it the path to the image. from PIL import Image image = Image.open('unsplash_01.jpg') If successful, the above returns an Image object. If there was a problem opening the file, an IOError exception will be raised. After obtaining an Image object, you can now use the methods and attributes defined by the class to process and manipulate it. Let's start by displaying the image. You can do this by calling the show() method on it. This displays the image on an external viewer (usually xv on Unix, and the Paint program on Windows). image.show() You can get some details about the image using the object's attributes. # The file format of the source file. print(image.format) # Output: JPEG # The pixel format used by the image. Typical values are “1”, “L”, “RGB”, or “CMYK.” print(image.mode) # Output: RGB # Image size, in pixels. The size is given as a 2-tuple (width, height). print(image.size) # Output: (1200, 776) vs The most important class in the Python Imaging Library is the Image class, defined in the module with the same name. You can create instances of this class in several ways; either by loading images from files, processing other images, or creating images from scratch. To load an image from a file, use the open function in the Image module. import Image im = Image.open("lena.ppm") If successful, this function returns an Image object. You can now use instance attributes to examine the file contents. print im.format, im.size, im.mode PPM (512, 512) RGB ... If the file cannot be opened, an IOError exception is raised. http://effbot.org/imagingbook/introduction.htm More on reddit.com

I am doing some image editing with the PIL libary. The point is, that I don't want to save the image each time on my HDD to view it in Explorer. Is there a small module that simply enables me to se... More on stackoverflow.com

I have just done some image processing using the Python image library (PIL) using a post I found earlier to perform fourier transforms of images and I can't get the save function to work. The whole... More on stackoverflow.com

The "pixels/inch" value is basically just extra metadata. As long as both images actually have the same amount of pixels, you're fine. More on reddit.com