Python的初学者,我一直在尝试更改图像的像素值,如下所示。我收到一个错误,说"类型错误:需要整数"在最后一行,但只有一行我该如何解决这个问题?这是我的代码:
from PIL import Image
img = Image.open(r'...')
pix = img.load()
def quantf(pval):
if pval>=0 and pval<0.25:
pval=0
elif pval>=0.25 and pval<0.5:
pval=0.25
elif pval>=0.5 and pval<0.75:
pval=0.5
elif pval>=0.75 and pval<1:
pval=0.75
elif pval==1:
pval=1
for i in range (0,31):
for j in range (0,31):
pix[i,j]=quantf(pix[i,j])
img.show()
根据:
http://pillow.readthedocs.io/en/3.4.x/reference/PixelAccess.html#example
执行图像加载后,使用多波段影像时,每个像素都是一个元组,否则它是一个单独的值:
from PIL import Image
im = Image.open('hopper.jpg')
px = im.load()
print (px[4,4])
指纹:
(23, 24, 68)
或
0.23
您需要调整quantf(pval)
函数以考虑这一点,并确保quantf(pval)
实际返回值。
例如:
def quantf(pval):
if pval[0]>=0 and pval[0]<64:
pval=(0, pval[1], pval[2])
elif pval[0]>=64 and pval[0]<128:
pval=(64, pval[1], pval[2])
elif pval[0]>=128 and pval[0]<192:
pval=(128, pval[1], pval[2])
elif pval[0]>=192 and pval[0]<256:
pval=(192, pval[1], pval[2])
return pval
或
def quantf(pval):
if pval>=0 and pval<0.25:
pval=0
elif pval>=0.25 and pval<0.5:
pval=0.25
elif pval>=0.5 and pval<0.75:
pval=0.5
elif pval>=0.75 and pval<1:
pval=0.75
elif pval==1:
pval=1
return pval