我想要一种方法来生成红色、绿色或蓝色的小型 RGB 方形图像。它应该产生纯色块,但 PIL 输出的图像非常奇怪。为什么?
import numpy as np
from PIL import Image
class MakeSquares():
def __init__(self):
self.num_rows = 3
self.num_cols = 3
self.colourmap = {'red': [255, 0, 0],
'green': [0, 255, 0],
'blue': [0, 0, 255]}
def generateExample(self, label):
arr = []
colour = label
colour_array = self.colourmap[colour]
for i in range(0, self.num_rows):
sarr = []
for j in range(0, self.num_cols):
sarr.append(colour_array)
arr.append(sarr)
narr = np.asarray(arr)
return narr
test = MakeSquares()
t = test.generateExample("red")
print t
testimage = Image.fromarray(t, "RGB")
testimage.save("testimage.jpg")
此代码返回以下 numpy 数组:
[[[255 0 0]
[255 0 0]
[255 0 0]]
[[255 0 0]
[255 0 0]
[255 0 0]]
[[255 0 0]
[255 0 0]
[255 0 0]]]
但是它生成和保存的图像都搞砸了(它应该只是 3x3,所以我把它放大了,这样你就可以看得更清楚了):