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Python PIL 学习笔记

PIL是什么:

PIL,全称Python Image Library,主要作用是图像处理,可用于图片剪切、粘贴、缩放、镜像、水印、颜色块、滤镜、图像格式转换、色场空间转换、验证码、旋转图像、图像增强、直方图处理、插值和滤波等功能


简单使用记录:

1.安装工具包

pip3 install Pillow


代码联系:

1.分离RGB图片的三个颜色通道实现颜色交换

from PIL import Image
from PIL import ImageFilter
from PIL import ImageDraw
from PIL import ImageFont


# 分离RGB图片的三个颜色通道实现颜色交换
def RGBImageTest():
    image = Image.open("李成敏.webp")
    r, g, b = image.split()
    newg = g.point(lambda i: i * 0.8)
    newb = g.point(lambda i: i < 100)
    om = Image.merge(image.mode, (r, newg, newb))
    om.save("20221213.jpeg")
    om.show()

if __name__ == '__main__':
    RGBImageTest()

原始图片:李成敏.webp

 执行RGBImageTest()函数效果:

 2.图像的过滤和增强

from PIL import Image
from PIL import ImageFilter
from PIL import ImageDraw
from PIL import ImageFont


# 图像的过滤和增强
def ImageFileterTest():
    image = Image.open(r"李成敏.webp")
    # 滤镜类型:
    # BLUR                模糊滤镜
    # CONTOUR             轮廓
    # EDGE_ENHANCE        边界加强
    # EDGE_ENHANCE_MORE   边界加强(阈值更大)
    # EMBOSS              浮雕滤镜
    # FIND_EDGES          边界滤镜
    # SMOOTH              平滑滤镜
    # SMOOTH_MORE         平滑滤镜(阈值更大)
    # SHARPEN             锐化滤镜
    # DETAIL              细节滤镜
    openImage = image.filter(ImageFilter.FIND_EDGES)
    openImage.save("20221213.jpg")
    openImage.show()


if __name__ == '__main__':
    ImageFileterTest()

执行效果:

3.自定义字体

from PIL import Image
from PIL import ImageFilter
from PIL import ImageDraw
from PIL import ImageFont

# 自定义字体
def ImageFontTest():
    image = Image.new(mode='RGB', size=(600, 80), color=(255, 234, 222))
    draw = ImageDraw.Draw(image, mode='RGB')
    font = ImageFont.truetype('hanyixiaosongrongfan.ttf', 50)
    draw.text([15, 5], "2022 辛苦了, 相信越来越好, 致自己", 'red', font=font)
    with open('2022 加油.png', 'wb') as f:
        image.save(f, format='png')
    image.show()

if __name__ == '__main__':
    ImageFontTest()

运行效果:

4.图片旋转

from PIL import Image
from PIL import ImageFilter
from PIL import ImageDraw
from PIL import ImageFont

#图片旋转
def TransposeTest():
    image = Image.open("李成敏.webp")
    # Image.transpose(method) method 参数列表
    # Image.FLIP_LEFT_RIGHT:左右水平翻转;
    # Image.FLIP_TOP_BOTTOM:上下垂直翻转;
    # Image.ROTATE_90:图像旋转90度;
    # Image.ROTATE_180:图像旋转180度;
    # Image.ROTATE_270:图像旋转270度;
    # Image.TRANSPOSE:图像转置;
    # Image.TRANSVERSE:图像横向翻转
    # 1.水平翻转
    img1 = image.transpose(Image.FLIP_LEFT_RIGHT)
    #2.垂直翻转
    img2 = image.rotate(180)
    #水平+垂直翻转
    img3 = image.transpose(Image.FLIP_LEFT_RIGHT).rotate(180)
    #调用画图模板
    draw = ImageDraw.Draw(img1)
    font = ImageFont.truetype('hanyixiaosongrongfan.ttf', 80)
    draw.text([480, 60], "2022 辛苦了, 相信越来越好, 致自己\n\r\r\r\r 2022.12.13", 'red', font=font)
    img1.show()

if __name__ == '__main__':
    TransposeTest()

运行效果: 

5.图片缩放

from PIL import Image
from PIL import ImageFilter
from PIL import ImageDraw
from PIL import ImageFont

#图片缩放
def ZoomImageTest():
    image = Image.open("李成敏.webp")
    w,h = image.size
    image.thumbnail((w/10,h/10))
    image.show()

if __name__ == '__main__':
    ZoomImageTest()

 运行效果:

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                                                   再见了,行程码(2022-12-13)!

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