Convert Python numpy array to PyQt QPixmap image result in noise image

[Ludicrous Gray]

Hello, I have 2 image data that are same but the first one has gone through pre-processing while the second one is from direct cv.imread . Both of this data are numpy array and has range between [0-255] . But I keep having blank/noisy result for my first data when I try to show it on my label , while the second data can show up without any problem. This is the code that I used, normal is the image data.

height, width, channel = normal.shape
bytesPerLine = 3 * width
qImg = QtGui.QImage(normal.data, width, height, bytesPerLine, QtGui.QImage.Format_RGB32)
self.normalImage = QtGui.QPixmap(qImg)
self.ui.normalDisplay.setPixmap(self.normalImage)

I hope someone can give me hint for my problem