python - 当我通过 python 的 PIL 将 .tif 合并到 RGB 波段时出错

Question

from PIL import Image
band2 = Image.open('band2.tif')
band3 = Image.open('band3.tif')
band4 = Image.open('band4.tif')
img = Image.merge("RGB",(band4,band3,band2))

band2.tif、band3.tif、band4.tif 在 USGS(https://earthexplorer.usgs.gov/) 中下载。与正常的 .TIF 相比，它们可能有一些不同

错误信息为

/usr/bin/python3.5 /home/lixingang/workspace/20170405/main.py
Traceback (most recent call last):
  File "/home/lixingang/workspace/20170405/main.py", line 5, in <module>
    img = Image.merge("RGB",(band4,band3,band2))
  File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2388, in merge
    raise ValueError("mode mismatch")
ValueError: mode mismatch

Process finished with exit code 1

Answer 1

您需要将每个 channel 转换为亮度 channel 。所以不是这个:

band2 = Image.open('band2.tif')

你需要这样做:

band2 = Image.open('band2.tif').convert('L')

与其他 channel 一样，合并时也要考虑顺序。