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VITA-Group / EnlightenGAN

[IEEE TIP] "EnlightenGAN: Deep Light Enhancement without Paired Supervision" by Yifan Jiang, Xinyu Gong, Ding Liu, Yu Cheng, Chen Fang, Xiaohui Shen, Jianchao Yang, Pan Zhou, Zhangyang Wang
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why does image_numpy need to add one，and divide 2，finally multipy 255 #123

Closed woaiwojia4816294 closed 2 years ago

woaiwojia4816294 commented 2 years ago

hello, i have a question about function tensor2im in util.py why does image_numpy need to add one, then divide two,finally multipy 255. Thanks a lot def tensor2im(image_tensor, imtype=np.uint8): image_numpy = image_tensor[0].cpu().float().numpy() image_numpy = (np.transpose(image_numpy, (1, 2, 0)) + 1) / 2.0 * 255.0 image_numpy = np.maximum(image_numpy, 0) image_numpy = np.minimum(image_numpy, 255) return image_numpy.astype(imtype)

yifanjiang19 commented 2 years ago

This is scaling transformation from [-1, 1] to [0, 255]