标签：div .text region end otto ack == seq bottom
from PIL import Image
im = Image.open("hopper.ppm")
from __future__ import print_function
print(im.format, im.size, im.mode)
#打应结果
PPM (512, 512) RGB
让图片显示，im.show(),因为打开是暂时的所以显示图片效果不太好，而且还有15功能,所以一般用来测试显示
改变图片的后缀，pil可以根据文件内容，自己判断文件类型
from __future__ import print_function
import os, sys
from PIL import Image
for infile in sys.argv[1:]:
f, e = os.path.splitext(infile)
outfile = f + ".jpg"
if infile != outfile:
try:
Image.open(infile).save(outfile)
except IOError:
print("cannot convert", infile)
如果后缀不合法会用第二个参数
from __future__ import print_function
import os, sys
from PIL import Image
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)
先打开文件确认类型，读取/解析会在稍后执行
from __future__ import print_function
import sys
from PIL import Image
for infile in sys.argv[1:]:
try:
with Image.open(infile) as im:
print(infile, im.format, "%dx%d" % im.size, im.mode)
except IOError:
pass
截取图片大小, (left, upper, right, lower)，坐标 (0, 0) in the upper left corner，准确来说是300*300pixeels
box = (100, 100, 400, 400) region = im.crop(box)
把图片反转180度再填回去
region = region.transpose(Image.ROTATE_180) im.paste(region, box)
def roll(image, delta):
"""Roll an image sideways."""
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))
#load是因为crop是个延迟操作，不这样会在第二步保存不到
part1.load()
part2.load()
image.paste(part2, (0, 0, xsize-delta, ysize))
image.paste(part1, (xsize-delta, 0, xsize, ysize))
return image
拆分成原生三原色，换位置再合并
r, g, b = im.split()
im = Image.merge("RGB", (b, g, r))
简单的几何逆时针旋转，transpose也可以在90度内旋转,也可以水平活垂直旋转
out = im.resize((128, 128)) out = im.rotate(45)
out = im.transpose(Image.FLIP_LEFT_RIGHT)
out = im.transpose(Image.FLIP_TOP_BOTTOM)
out = im.transpose(Image.ROTATE_90)
out = im.transpose(Image.ROTATE_180)
out = im.transpose(Image.ROTATE_270)
不通像素之间图片
from PIL import Image
im = Image.open("hopper.ppm").convert("L")
增强图像
from PIL import ImageFilter out = im.filter(ImageFilter.DETAIL)
改变对比度
out = im.point(lambda i: i * 1.2)
具体操作图片
# split the image into individual bands source = im.split() R, G, B = 0, 1, 2 # select regions where red is less than 100 mask = source[R].point(lambda i: i < 100 and 255) # process the green band out = source[G].point(lambda i: i * 0.7) # paste the processed band back, but only where red was < 100 source[G].paste(out, None, mask) # build a new multiband image im = Image.merge(im.mode, source)
你可以用这种方式调整对比度、亮度、颜色平衡和锐度
from PIL import ImageEnhance
enh = ImageEnhance.Contrast(im)
enh.enhance(1.3).show("30% more contrast")
打开动态图,并跳帧播放一次结束
from PIL import Image
im = Image.open("animation.gif")
im.seek(1) # skip to the second frame
try:
while 1:
im.seek(im.tell()+1)
# do something to im
except EOFError:
pass # end of sequence
循环播放
from PIL import ImageSequence
for frame in ImageSequence.Iterator(im):
# ...do something to frame...
在打印机上打印
from PIL import Image
from PIL import PSDraw
im = Image.open("hopper.ppm")
title = "hopper"
box = (1*72, 2*72, 7*72, 10*72) # in points
ps = PSDraw.PSDraw() # default is sys.stdout
ps.begin_document(title)
# draw the image (75 dpi)
ps.image(box, im, 75)
ps.rectangle(box)
# draw title
ps.setfont("HelveticaNarrow-Bold", 36)
ps.text((3*72, 4*72), title)
ps.end_document()
也可以这样打开
from PIL import Image
with open("hopper.ppm", "rb") as fp:
im = Image.open(fp)
from PIL import Image, TarIO
fp = TarIO.TarIO("Tests/images/hopper.tar", "hopper.jpg")
im = Image.open(fp)
This is only available for JPEG and MPO files.
from PIL import Image
from __future__ import print_function
im = Image.open(file)
print("original =", im.mode, im.size)
im.draft("L", (100, 100))
print("draft =", im.mode, im.size)
#This prints something like:
original = RGB (512, 512)
draft = L (128, 128)
标签：div .text region end otto ack == seq bottom
原文地址：https://www.cnblogs.com/piaoshi/p/8969135.html
