## Pillow

图像处理

## Usage

创建图片

```
from PIL import Image

image = Image.open('python-logo.png')
print(image.format, image.size, image.mode)  # 查看图像实例的属性
image.show()  # 显示图像


f, _ = os.path.splitext(image_path)
outfile = f + ".jpg"
try:
    Image.open(image_path).save(outfile)  # 修改文件格式
except IOError:
    print("无法转换", image_path)

```



处理图片

```
def roll(image, delta):
    xsize, ysize = image.size
    delta = delta % xsize
    if delta == 0:
        return image
    part1 = image.crop((0, 0, delta, ysize))
    part2 = image.crop((delta, 0, xsize, ysize))
    image.paste(part1, (xsize - delta, 0, xsize, ysize))
    image.paste(part2, (0, 0, xsize - delta, ysize))
    return image

image_path = 'test.jpg'
im = Image.open(image_path)
roll(im, 300).show()  # 向侧面滚动300像素

```