Python 使用 RGB 数据将输入数据剪切到 imshow 的有效范围([0..1] 表示浮点数或 [0..255] 表示整数)
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Clipping input data to the valid range for imshow with RGB data ([0..1] for floats or [0..255] for integers)
提问by Ankita Shinde
I tried to run the graph cut algorithm for a slice of an MRI after converting it into PNG format. I keep encountering the following problem:
在将 MRI 切片转换为 PNG 格式后,我尝试对其运行图形切割算法。我一直遇到以下问题:
Clipping input data to the valid range for imshow with RGB data ([0..1] for floats or [0..255] for integers).
This is even after setting vmin
and vmax
as follows:
这甚至设置后vmin
和vmax
如下:
plt.imshow(out, vmin=0, vmax=255)
回答by Dat Nguyen
回答by Anh-Thi DINH
Instead of plt.imshow(out)
, use plt.imshow(out.astype('uint8'))
. That's it!
而不是plt.imshow(out)
,使用plt.imshow(out.astype('uint8'))
。就是这样!
回答by L.YS
If you want to show it, you can use img/255
.
如果你想显示它,你可以使用img/255
.
Or
或者
np.array(img,np.int32)
The reason is that if the color intensity is a float, then matplotlib expectsit to range from 0 to 1. If an int, then it expects 0 to 255. So you can either force all the numbers to int or scale them all by 1/255.
原因是如果颜色强度是一个浮点数,那么matplotlib 期望它的范围从 0 到 1。如果是 int,那么它期望是 0 到 255。所以你可以强制所有数字为 int 或将它们全部缩放 1 /255。