Example of processing rounded and circular images using python

As follows:

Figure 1 (the Avatar is cropped in a circular shape, and the others are transparent)

Figure 2 (add an ellipse to the four corners of the image)

I have never handled it before. It is a little laborious to handle it.

Modules used:
Copy codeThe Code is as follows:
Import OS, math
Import Image
Import ImageDraw

1. the Avatar is cropped in a circular shape and the others are transparent.

After searching for a long time, I didn't find a good method. I used a strange method for a blog (Sorry, I forgot my blog address). I tried it, no format conversion is available except for processing JPG images. I followed that method first.

Copy codeThe Code is as follows:
Def circle ():

Ima = Image. open ("test.jpg"). convert ("RGBA ")

Size = ima. size

# A square image is required because the circle is required

R2 = min (size [0], size [1])

If size [0]! = Size [1]:

Ima = ima. resize (r2, r2), Image. ANTIALIAS)

Imb = Image. new ('rgba', (r2, r2), (255,255,255, 0 ))

Pima = ima. load ()

Pimb = imb. load ()

R = float (r2/2) # abscissa of the center

For I in range (r2 ):

For j in range (r2 ):

Lx = abs (I-r + 0.5) # abscissa from the center of the circle

Ly = abs (j-r + 0.5) # ordinate the distance from the center to the center

L = pow (lx, 2) + pow (ly, 2)

If l <= pow (r, 2 ):

Pimb [I, j] = pima [I, j]

Imb. save ("test_circle.png ")

This method calculates the distance from each pixel to the origin (that is, the image center point) to draw a circle.

2. Add an ellipse to the four corners of the image
Copy codeThe Code is as follows:
Def circle_corder_image ():

Im = Image. open ("test.jpg"). convert ("RGBA ")

Rad = 10 # Set the radius

Circle = Image. new ('l', (rad * 2, rad * 2), 0)

Draw = ImageDraw. Draw (circle)

Draw. ellipse (0, 0, rad * 2, rad * 2), fill = 255)

Alpha = Image. new ('l', im. size, 255)

W, h = im. size

Alpha. paste (circle. crop (0, 0, rad, rad), (0, 0 ))

Alpha. paste (circle. crop (0, rad * 2), (0, h-rad ))

Alpha. paste (circle. crop (rad, 0, rad * 2, rad), (w-rad, 0 ))

Alpha. paste (circle. crop (rad, rad, rad * 2, rad * 2), (w-rad, h-rad ))

Im. putalpha (alpha)

Im.save('test_circle_corder.png ')

After using this method, I thought about it. The Avatar is cut into a circular image, and the others are transparent. This method is also acceptable, so the following method is used to draw a circular image:
Copy codeThe Code is as follows:
Def circle_new ():

Ima = Image. open ("test.jpg"). convert ("RGBA ")

Size = ima. size

R2 = min (size [0], size [1])

If size [0]! = Size [1]:

Ima = ima. resize (r2, r2), Image. ANTIALIAS)

Circle = Image. new ('l', (r2, r2), 0)

Draw = ImageDraw. Draw (circle)

Draw. ellipse (0, 0, r2, r2), fill = 255)

Alpha = Image. new ('l', (r2, r2), 255)

Alpha. paste (circle, (0, 0 ))

Ima. putalpha (alpha)

Ima.save('test_circle.png ')

Although I have all the things I want at last, I have learned how powerful python image processing is by studying these two questions. Many of them are worth studying.