在python中使用pil读取tif图像时出现值错误? [英] Value Error in reading tif image with pil in python?
问题描述
我必须读取尺寸为 2200x 2200 的tif图像，然后键入uint16.我将PIL库与anaconda python结合使用，如下所示:
I have to read a tif image of size 2200x 2200 and type uint16. I use PIL library with anaconda python as follows:
from PIL import Image
img = Image.open('test.tif')
img.imshow()
我对此有以下错误:ValueError: tile cannot extend outside image
这可能是什么原因以及如何解决?我正在使用anaconda python3.6.1版本
What could be the reason for this and how to fix this? I am using anaconda python3.6.1 version
推荐答案
这是因为图像编码中存在错误； TIF文件中的图块实际上确实在图像外部延伸.您可以通过查看图块来确认这一点:
This is because there is an error in the image encoding; the tiles in the TIF file actually do extend outside the image. You can confirm this by viewing the tiles:
img.tile
它将输出类似的内容:
[('tiff_lzw', (0, 0, 240, 240), 16, 'RGB'),
('tiff_lzw', (240, 0, 480, 240), 94905, 'RGB'),
...
('tiff_lzw', (720, 960, 960, 1200), 1711985, 'RGB'),
('tiff_lzw', (960, 960, 1200, 1200), 1730566, 'RGB')]
[('tiff_lzw', (0, 0, 240, 240), 16, 'RGB'),
('tiff_lzw', (240, 0, 480, 240), 94905, 'RGB'),
...
('tiff_lzw', (720, 960, 960, 1200), 1711985, 'RGB'),
('tiff_lzw', (960, 960, 1200, 1200), 1730566, 'RGB')]
在我上面的示例中，图像尺寸为1000x1000像素，但很明显，图块扩展为1200x1200.您可以将图像裁剪为期望的大小(丢失一些信息)，或者扩展图像大小以包括所有图块.在此处查看示例:
In the case of my example above, the image dimensions were 1000x1000 pixels, but clearly the tiles extend to 1200x1200. You can either crop the image to the expected size (losing some information), or expand the image size to include all the tiles. See examples here:
https://github.com/python-pillow/Pillow/issues/3044
即im.size = (1000, 1000)或im.tile = [e for e in im.tile if e[1][2] < 1200 and e[1][3] < 1200]
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