我正在嘗試通過使用 pynrrd 讀取該 nrrd 影像，然后使用我試圖形成影像的像素將 nrrd 檔案轉換為 jpg，但我得到的輸出是可怕的對比度影像。下面是我試過的
import numpy as np
import nrrd
from PIL import Image
import numpy as np
filename = "/content/drive/MyDrive/CT.nrrd"
readdata, header = nrrd.read(filename)
print(readdata.shape) # (512, 512, 504)
for i in range(504):
if i == 200:
img = np.array(readdata[:,:,i])
print(img.shape)
print(np.amax(img))
img = (np.maximum(img, 0) / img.max()) * 255.0
img = Image.fromarray(np.uint8(img), mode = "L")
img.save(f'/content/testrgb{i}.png')
break
我得到的輸出是這個
有人可以幫我嗎
uj5u.com熱心網友回復：
從 PIL 匯入影像匯入 numpy 作為 np 匯入 nrrd
def manipulating_nrrd_contrast(img, level):
img_c = img.astype(int).copy()
factor = (8 * (level 255)) / (255 * (259-level)) #This 8 here is the value that i changes manually by try and test and found out that this works best
img_c = factor * (img_c - 128) 128
img_c = np.clip(img_c, 0, 255)
return img_c.astype(np.uint8)
filename = "/content/drive/MyDrive/CT.nrrd"
readdata, header = nrrd.read(filename)
tag_info = get_meta_data(header)
print(tag_info)
print(readdata.shape)
for i in range(readdata.shape[2]):
b = np.asarray(readdata[:,:,i]).astype(int)
final = Image.fromarray(manipulating_nrrd_contrast(b, 128))
final.save(f'/content/png/testrgb{i}.png')
而且，我得到的結果如下
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