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Filtering Images based on size attributes in Python?
Python provides multiple libraries for image processing including Pillow, Python Imaging library, scikit-image or OpenCV.
We are going to use Pillow library for image processing here as it offers multiple standard procedures for image manipulation and supports the range of image file formats such as jpeg, png, gif, tiff, bmp and others.
Pillow library is built on top of Python Imaging Library(PIL) and provides more features than its parent library(PIL).
Installation
We can install pillow using pip, so just type following in the command terminal −
$ pip install pillow
Basic operation on a pillow
Let’s some basic operation on images using pillow library.
from PIL import Image image = Image.open(r"C:\Users\rajesh\Desktop\imagefolder\beach-parga.jpg") image.show() # The file format of the source file. # Output: JPEG print(image.format) # The pixel format used by the image. Typical values are “1”, “L”, “RGB”, or “CMYK.” # Output: RGB print(image.mode) # Image size, in pixels. The size is given as a 2-tuple (width, height). # Output: (2048, 1365) print(image.size) # Colour palette table, if any. #Output: None print(image.palette)
Output
JPEG RGB (2048, 1365) None
Filter images based on size
Below program will reduce the size of all the images from a particular path(default path: current working directory). We can change the max_height, max_width or extension of the image in the below-given program:
Code
import os
from PIL import Image
max_height = 900
max_width = 900
extensions = ['JPG']
path = os.path.abspath(".")
def adjusted_size(width,height):
if width > max_width or height>max_height:
if width > height:
return max_width, int (max_width * height/ width)
else:
return int (max_height*width/height), max_height
else:
return width,height
if __name__ == "__main__":
for img in os.listdir(path):
if os.path.isfile(os.path.join(path,img)):
img_text, img_ext= os.path.splitext(img)
img_ext= img_ext[1:].upper()
if img_ext in extensions:
print (img)
image = Image.open(os.path.join(path,img))
width, height= image.size
image = image.resize(adjusted_size(width, height))
image.save(os.path.join(path,img))Output
another_Bike.jpg clock.JPG myBike.jpg Top-bike-wallpaper.jpg
On running above script, the size of the images present in the present working directory (which is currently pyton script folder), will have a maximum size of 900(width/height).
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