Examples of Python processing rounded pictures and round pictures

As follows:

Figure 1 (head picture cut to round, others transparent)

Figure 2 (the 4 corners of the picture plus an ellipse)

I haven't dealt with it before, it's a bit of a struggle to deal with.

Modules used:

The code is as follows:

Import OS, Math
Import Image
Import Imagedraw

1 head pictures cut round, others transparent

Search for a long time, did not find a better way, there is a blog (sorry, forget the blog address) with a more bizarre method, I tried, in addition to processing JPG pictures No format conversion, the other is not a problem, I was the first way to do

The code is as follows:

Def circle ():

IMA = Image.open ("Test.jpg"). Convert ("RGBA")

Size = Ima.size

# because it's going to be round, so need a square picture

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) #圆心横坐标

For I in range (R2):

For j in Range (R2):

LX = ABS (i-r+0.5) #到圆心距离的横坐标

ly = ABS (j-r+0.5) #到圆心距离的纵坐标

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 center point of the picture) to draw a circle.

2. Add an ellipse to the 4 corners of the picture

The code is as follows:

Def circle_corder_image ():

im = Image.open ("Test.jpg"). Convert ("RGBA")

rad = 10 # Set 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, Rad, 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 ')

With this method, think of a thought, head picture cut into a round, the other for transparency, with this method is also possible, so the circle has the following method:

The 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 the last thing I want to have, but through the study of these 2 questions, I saw the Python image processing is powerful, and much more worthy of my study.

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