I tried to use OpenCV as well but I was getting an Assertion Error i.e error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/resize.cpp:4044: error: (-215:Assertion failed) !ssize.empty() in function 'resize'įrom keras. Why is the image coming out the way it is? and what can be done to fix it? If a possible solution is present in OpenCV that'd be welcome as well. Image. However I found out that image opened was blurry as opposed to the original image. Image module of the image processing library Pillow (PIL) provides resize () method to resize images. Here's a python script that uses this function to run batch image resizing.I was using PIL library to open an image and then convert it into array later on for DL operations. Print('writing to disk'.format(out_f_path)) Img = img.resize((max_px_size, hsize), Image.ANTIALIAS) Hsize = int(float(height_0) * float(wpercent)) Out_f_path = os.path.join(output_folder, out_f_name) Not the prettiest but gets the job done and is easy to understand: def resize(img_path, max_px_size, output_folder): Return img.resize(size_new, resample=Image.LANCZOS)Ī simple method for keeping constrained ratios and passing a max width / height. If img_ratio = video_ratio: # image is not tall enough To resize an image, you call the resize() method of pillows image class by giving width and height. Width, height = video_size # these are the MAX dimensions So after I couldn't find an obvious way to do that here (or at some other places), I wrote this function and put it here for the ones to come: from PIL import Imageĭef get_resized_img(img_path, video_size): To resize an image with Pillow’s resize () method: Import the PIL image class: from PIL import Image Load the image from a file with the open () function: image Image. The following script creates nice thumbnails of all JPEG images in the current directory preserving aspect ratios with 128x128 max resolution. It does this by determining what percentage 300 pixels is of the original width (img.size0) and then multiplying the original height (img.size1) by that percentage.
The Image.thumbnail method was promising, but I could not make it upscale a smaller image. This script will resize an image (somepic.jpg) using PIL (Python Imaging Library) to a width of 300 pixels and a height proportional to the new width. I was trying to resize some images for a slideshow video and because of that, I wanted not just one max dimension, but a max width and a max height (the size of the video frame).Īnd there was always the possibility of a portrait video. I hope it might be helpful to someone out there! Noo need to reinvent the wheel, there is the Image.thumbnail method available for this: maxsize (1028, 1028) image. Santhanavanich Towards Data Science 500 Apologies, but something went wrong on our end. We then loop over each file in the listdir () method of the directory If the file ends with a jpeg, png, or jpg, then we resize the image We do this by. Change this to whatever folder is holding the images you want to resize. I tried to document it as much as I can, so it is clear. Batch-Resizing Images in Python with Pillow by Joe T. Let’s break down what we did here: We loaded the directory into a string. # Enter the name under which you would like to save the new imageĪnd, it is done. # resample filter ->, (default),, etc. #new_width = round(new_height * asp_rat) # uncomment the second line (new_width) and comment the first one (new_height) # NOTE: if you want to adjust the width to the height, instead -> Img = img.resize((new_width, new_height), Image.ANTIALIAS) Img = Image.open(img_path) # puts our image to the buffer of the PIL.Image object
And, in the age of responsive designs, you want more. This allows to process about 2.5k photos per hour on a single core.
You do not need the semicolons ( ), I keep them just to remind myself of syntax of languages I use more often. Entry conditions are as follows: a photo shot with the latest iPhone takes about 1.37 sec to get resized to 2 MP via Pillow 2.6 with none of the optimizations implemented. In this case, it will adjust the height to match the width of the new image, based on the initial aspect ratio, asp_rat, which is float (!).īut, to adjust the width to the height, instead, you just need to comment one line and uncomment the other in the else loop. I will also add a version of the resize that keeps the aspect ratio fixed. Pillow is one of the most popular options for performing basic image manipulation tasks such as cropping, resizing, or adding watermarks.
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