Python编程：pillow对图像的简单处理

from PIL import Image
def show_info():
    im = Image.open("image.jpg")
    print(im.mode)  # RGB
    print(im.format)  # JPEG
    print(im.size)  # (1200, 800)
    print(im.filename)  # image.jpg
    print(im.width)  # 1200
    print(im.height)  # 800

def convert_format():
    Image.open("image.jpg").save("image.png")
    im = Image.open("image.png")
    print(im.mode)  # RGB
    print(im.format)  # PNG

def create_thumbnail():
    im = Image.open("image.jpg")
    im.thumbnail((120, 80))
    im.save("image_thumbnail.jpg", "PNG")

def crop_iamge():
    im = Image.open("image.jpg")
    box = (206, 180, 994, 648)   # 左上角和右下角坐标，类似qq截图
    region = im.crop(box)
    region.save("image_region.jpg")
    # 处理子图，旋转180度，粘贴回原图
    region = region.transpose(Image.ROTATE_180)
    im.paste(region, box)
    im.save("image_paste.jpg")

def roll_image():
    im = Image.open("image_region.jpg")
    image = im.copy()
    delta = 2
    width_half = image.width // delta
    box_left = (0, 0, width_half, image.height)
    box_right = (width_half, 0, image.width, image.height)
    part_left = image.crop(box_left)
    part_right = image.crop(box_right)
    image.paste(part_left, box_right)
    image.paste(part_right, box_left)
    image.save("image_roll.jpg")

def split_merge():
    im = Image.open("image_region.jpg")
    r, g, b = im.split()
    print(r, g, b)
    r.save("r.jpg")
    g.save("g.jpg")
    b.save("b.jpg")
    image = Image.merge("RGB", (r, g, b))
    image.save("image_merge.jpg")

def resize():
    im = Image.open("image_region.jpg")
    out = im.resize((128, 128))
    out.save("image_resize.jpg")

def rotate():
    im = Image.open("image_region.jpg")
    out = im.rotate(45)
    out.save("image_rotate.jpg")

def transpose():
    im = Image.open("image_region.jpg")
    # 左右镜像
    out = im.transpose(Image.FLIP_LEFT_RIGHT)
    out.save("image_flip_left_right.jpg")
    # 上下镜像
    out = im.transpose(Image.FLIP_TOP_BOTTOM)
    out.save("image_flip_top_bottom.jpg")
    # 旋转90度
    out = im.transpose(Image.ROTATE_90)
    out.save("image_rotate_90.jpg")
    # 旋转180度
    out = im.transpose(Image.ROTATE_180)
    out.save("image_rotate_180.jpg")
    # 旋转270度
    out = im.transpose(Image.ROTATE_270)
    out.save("image_rotate_270.jpg")

def convert_l():
    im = Image.open('image_region.jpg').convert('L')
    im.save("image_l.jpg")

from PIL import ImageFilter
def filter():
    im = Image.open('image_region.jpg')
    im.filter(ImageFilter.DETAIL)
    im.save("image_detail.jpg")

im = Image.open('image_region.jpg')
out = im.point(lambda i: i * 1.2)
out.save("image_point.jpg")

参考
PIL 中的 Image 模块
Python图像处理库：Pillow 初级教程