How to use Python to change negatives with one button

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Preface

Knowledge points:

1. Image processing.

2.OpenCV

3.numpy

Basic knowledge of 4.python

Environment:

Windows

Pycharm

Python3

Steps

Pour into the library

Import numpy as npimport cv2

Change the name if you install it directly at the command prompt

Pip install OpenCV-python

Image import

Img = cv2.imread ('timg.jpg')

Scalin

Rows,cols,channels = img.shapeprint (rows,cols,channels) img = cv2.resize (img,None,fx=0.5,fy=0.5) rows,cols,channels = img.shapeprint (rows,cols,channels)

Display and process the content of the image

Convert an image to a binary image

Cv2.imshow ('img',img) hsv = cv2.cvtColor (img,cv2.COLOR_BGR2HSV) cv2.imshow (' hsv',hsv) lower_blue = np.array upper_blue = np.array ([110255255])

Binarization function

Mask = cv2.inRange (hsv,lower_blue,upper_blue) cv2.imshow ('Mask',mask)

Corrosion

Erosion = cv2.erode (mask,None,iterations=1) cv2.imshow ('erosion',erosion)

Expansion

Dilation = cv2.dilate (mask, None,iterations=1) cv2.imshow ('dilation',dilation)

For i in range (rows): for j in range (cols): if dilation [iMagnej] = = 25525: img [iMagnej] = (0mem0255) # rgb (255Lot0) BGR () cv2.imshow ('res',img)

Save

Cv2.imwrite ('ting.png',img) cv2.waitKey (0) # 0 infinitely waiting for cv2.destroyAllWindows () # destroy all windows thank you for reading! This is the end of this article on "how to use Python to change negatives with one click". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!