| Handing Images in Python |
There are three ways of reading and writing images in Python, namely using Python Imaging Library (PIL), OpenCV with Python or PyOpenCV. The last one is an alternative wrapper for OpenCV. You will need to install these libraries if you want to use any of them.
Python Imaging Library
 Import Python Imaging Library (PIL)
import Image
Read and write PIL image
pilimg = Image.open(“example.jpg”)
pilimg.save(“pil.jpg”)
Convert PIL image to numpy array
arr = numpy.array(pilimg)
Convert numpy array to PIL image
pilimg = Image.fromarray(arr)
OpenCV with Python
Import OpenCV
import cv
Read and write OpenCV image
cvimg = cv.LoadImage(“example.jpg”)
cv.SaveImage(“cv.jpg”, cvimg) )
PyOpenCV
Import PyOpenCV
import pyopencv
Read and write PyOpenCV image
pcvimg = pyopencv.imread(“example.jpg”)
pyopencv.imwrite(“pcv.jpg”, pcvimg)
Convert PyOpenCV image to numpy array
arr = pcvimg.asndarray
Convert numpy array to PyOpenCV image
pcvimg = pyopencv.asMat(arr)
Convert PyOpenCV image to PIL image
pilimage = pcvimg.to_pil_image()
Convert PIL image to PyOpenCV image
pcvimg = pyopencv.Mat.from_pil_image(pilimg)
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