PIL之基础应用

>>> from PIL import Image

>>> #读取图像文件

...

>>> gal=Image.open('/Users/similarface/PycharmProjects/mybook/products/2016/06/13/1_TIBX78J.png')

>>> #查看文件大小

...

>>> gal.size

(100, 100)

>>> #显示文件

...

>>> gal.show()

>>> #显示灰度图像

...

>>> gal.convert('L').show()

>>> gal.mode

'RGBA'

>>> gal.format

'PNG'

'''

将图片的格式转化成jpg格式的

'''

filelist=[]

for infile in filelist:

    f, e = os.path.splitext(infile)

    outfile = f + ".jpg"

    if infile != outfile:

        try:

            Image.open(infile).save(outfile)

        except IOError:

            print "cannot convert", infile

'''

将图片生成缩略图

'''

size = 128, 128

for infile in sys.argv[1:]:

    outfile = os.path.splitext(infile)[0] + ".thumbnail"

    if infile != outfile:

        try:

            im = Image.open(infile)

            im.thumbnail(size)

            im.save(outfile, "JPEG")

        except IOError:

            print "cannot create thumbnail for", infile

#获取文件基础消息
import Image

for infile in filelist:

    try:

        im = Image.open(infile)

        print infile, im.format, "%dx%d" % im.size, im.mode

    except IOError:

        pass

'''

Cutting, Pasting and Merging Images #

'''

>>> box=(0,25,70,50)

>>> region=gal.crop(box)

>>> region.show()

#存储的图片是从原始文件左上角为参照原点（0，25）开始

#70长 50高的图片

#将图片旋转180

region=region.transpose(Image.ROTATE_180)

>>> region.save('/tmp/sub.png',"PNG")

def roll(image, delta):

    "Roll an image sideways"

    xsize, ysize = image.size

    delta = delta % xsize

    if delta == 0:

        return image

    #图像裁减

    part1 = image.crop((0, 0, delta, ysize))

    part2 = image.crop((delta, 0, xsize, ysize))

    #图像粘贴

    image.paste(part2, (0, 0, xsize-delta, ysize))

    image.paste(part1, (xsize-delta, 0, xsize, ysize))

    return image    

#将颜色通道分割 ［这儿是rgba的图像格式，有rgb的］

r,g,b ,a= gal.split()

#合并通道

im = Image.merge("RGB", (b, g, r))

im.show()

im = Image.merge("RGB", (b, g, a))

>>> gal=Image.open('/Users/similarface/PycharmProjects/mybook/products/2016/06/13/1_TIBX78J.png')

>>>

>>> gal.resize((128,128))

<PIL.Image.Image image mode=RGBA size=128x128 at 0x108AECF90>

#重新设置大大

>>> gal.resize((1128,1128)).show()

#旋转45度

>>> gal.rotate(45).show()

#旋转30度

>>> gal.rotate(30).show()

#图像左右对称图

gal.transpose(Image.FLIP_LEFT_RIGHT).show()

#图像上下对称图

gal.transpose(Image.FLIP_TOP_BOTTOM)

#图像旋转

out = im.transpose(Image.ROTATE_90)

out = im.transpose(Image.ROTATE_180)

out = im.transpose(Image.ROTATE_270)

巴特西

PIL之基础应用

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