I’m trying to convert an RGB to a gray-value image of the same size (with values between 0 and 1). The mapping is done by a dictionary called MASK_LUT_IDX which takes in a tuple (RGB) and returns the corresponding value. The current code is 2x faster than before, but still takes 1.5s (according to timei…
Tag: python-imaging-library
Iterating through a function returned 2-tuple containing two lists?
I am trying to learn the PIL’s image library and I am stuck yet a second time. What I am trying to do is read through a directory and all its subdirectories and only load, rotate and replace the images in a specific path entered by the user (or specified in the script). The problem is that line () in
Scale and crop an image in python PIL without exceeding the image dimensions
I am cropping an image using python PIL. Say my image is as such: This is the simple code snippet I use for cropping: The result of this is: I want to scale out this cropped image keeping the aspect ratio (proportionate width and height) same by say 20% to look something like this without exceeding the image …
How to create overlapping semitransparent shapes on semitransparent background with PIL
I’m trying to create image with semitransparent shapes drawn on transparent background. For some reason instead of staying transparent, the shapes are completely covering those beneath them. My code: I would expect the result to look something like (except for background not being transparent):but it lo…
How to merge a transparent png image with another image using Scikit-image
This is basically the same question that was posted here: How to merge a transparent png image with another image using PIL but using with scikit-image instead of PIL. I mean to paste the png keeping its transparency on top of a background image. Also, if there is actually a way of doing it, I would like to k…
Script freezes after completing a ‘while’ loop in a ‘while’ loop (oops)
How can get the RGB values of every pixel in an image and after it gets all the values of the first row? Script: Answer The way you initialize your x and y values is the problem. X should be initialized back to zero immediately before the second while loop, so that the count starts again for the width of
What is the difference between images in ‘P’ and ‘L’ mode in PIL?
According to https://pillow.readthedocs.io/en/3.1.x/handbook/concepts.html#concept-modes, What are the difference between them? Can we convert from one to another? What are the examples of image for both mode? Answer Normally, images are RGB, which means they have 3 channels, one for red, one for green and on…
Faster bit-level data packing
An 256*64 pixel OLED display connected to Raspberry Pi (Zero W) has 4 bit greyscale pixel data packed into a byte (i.e. two pixels per byte), so 8192 bytes in total. E.g. the bytes become Converting these bytes either obtained from a Pillow (PIL) Image or a cairo ImageSurface takes up to 0.9 s when naively it…
How to save an image list in PDF using PIL (pillow)?
I want use PIL .save() method for export my PIL image list to pdf. in the PIL document , saving part say: => we can use append_images option for pdf format. and in pillow’s github page , this issue say : Added append_images to PDF saving #2526 I wrote this code: but it doesn’t work! These error…
PIL Drawing a semi-transparent square overlay on image
This is giving me a giant black square. I want it to be a semi transparent black square with a cat. Any Ideas? Answer Sorry, the comment I made about it being a bug was incorrect, so… You can do it by creating a temporary image and using Image.alpha_composite() as shown in the code below. Note that it s…