基础图像处理

# load library

from PIL import Image
# read image

pil_im = Image.open('cloud.jpg')
pil_im
image.png
# convert image to grayscale one

pil_im = Image.open('cloud.jpg').convert('L')
pil_im
image.png
# create thumbnail image

pil_im.thumbnail((300,300))
pil_im
image.png
# crop a region

pil_im = Image.open('cloud.jpg')
box = (200,200,500,500)
region = pil_im.crop(box)
region
image.png
# rotate this region (90 degrees)

region = region.transpose(Image.ROTATE_90)
region
image.png
# put back this region to fig

pil_im.paste(region, box)
pil_im
image.png
# resize image

pil_im = Image.open('cloud.jpg')
pil_im.resize((128,128))
image.png
# rotate image 45 degrees (counter-clockwise)

pil_im = Image.open('cloud.jpg')
pil_im = pil_im.resize((128,128))
pil_im.rotate(30)
image.png
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