python-imaging-library - w3toppers.com

How to update the image of a Tkinter Label widget?

The method label.configure does work in panel.configure(image=img). What I forgot to do was include the panel.image=img, to prevent garbage collection from deleting the image. The following is the new version: import Tkinter as tk import ImageTk root = tk.Tk() img = ImageTk.PhotoImage(Image.open(path)) panel = tk.Label(root, image=img) panel.pack(side=”bottom”, fill=”both”, expand=”yes”) def callback(e): img2 = ImageTk.PhotoImage(Image.open(path2)) panel.configure(image=img2) … Read more

Trim whitespace using PIL

I don’t think there is anything built in to PIL that can do this. But I’ve modified your code so it will do it. It gets the border colour from the top left pixel, using getpixel, so you don’t need to pass the colour. Subtracts a scalar from the differenced image, this is a quick … Read more

Image library for Python 3

The “friendly PIL fork” Pillow works on Python 2 and 3. Check out the Github project for support matrix and so on.

Convert RGBA PNG to RGB with PIL

Here’s a version that’s much simpler – not sure how performant it is. Heavily based on some django snippet I found while building RGBA -> JPG + BG support for sorl thumbnails. from PIL import Image png = Image.open(object.logo.path) png.load() # required for png.split() background = Image.new(“RGB”, png.size, (255, 255, 255)) background.paste(png, mask=png.split()[3]) # 3 … Read more

How does perspective transformation work in PIL?

To apply a perspective transformation you first have to know four points in a plane A that will be mapped to four points in a plane B. With those points, you can derive the homographic transform. By doing this, you obtain your 8 coefficients and the transformation can take place. The site http://xenia.media.mit.edu/~cwren/interpolator/ (mirror: WebArchive), … Read more

Get pixel’s RGB using PIL

Yes, this way: im = Image.open(‘image.gif’) rgb_im = im.convert(‘RGB’) r, g, b = rgb_im.getpixel((1, 1)) print(r, g, b) (65, 100, 137) The reason you were getting a single value before with pix[1, 1] is because GIF pixels refer to one of the 256 values in the GIF color palette. See also this SO post: Python … Read more

How to write PNG image to string with the PIL?

You can use the BytesIO class to get a wrapper around strings that behaves like a file. The BytesIO object provides the same interface as a file, but saves the contents just in memory: import io with io.BytesIO() as output: image.save(output, format=”GIF”) contents = output.getvalue() You have to explicitly specify the output format with the … Read more

How to install PIL with pip on Mac OS?

Install Xcode and Xcode Command Line Tools as mentioned. Use Pillow instead, as PIL is basically dead. Pillow is a maintained fork of PIL. https://pypi.org/project/Pillow/ pip install Pillow If you have both Pythons installed and want to install this for Python3: python3 -m pip install Pillow

Python Image Library fails with message “decoder JPEG not available” – PIL

libjpeg-dev is required to be able to process jpegs with pillow (or PIL), so you need to install it and then recompile pillow. It also seems that libjpeg8-dev is needed on Ubuntu 14.04 If you’re still using PIL then you should really be using pillow these days though, so first pip uninstall PIL before following … Read more

scipy.misc module has no attribute imread?

imread is deprecated in SciPy 1.0.0, and will be removed in 1.2.0. Use imageio.imread instead. import imageio im = imageio.imread(‘astronaut.png’) im.shape # im is a numpy array (512, 512, 3) imageio.imwrite(‘imageio:astronaut-gray.jpg’, im[:, :, 0])