The image contrast change in the demo image of Fig. 1

[HaisongDing]

The resulting image seems darker than the input image, is it expected or a bug in the inference code, or a mistack when drawing the demo picture? To my understanding, if you only need to change the "text" within a given mask, the other pixels in the image should not change at all.

[Sundragon1993]

https://github.com/ZYM-PKU/UDiffText/assets/9301684/18d880c1-f3b3-4913-be74-60b04868372c
In my case, the resulting image seems brighter ... @ZYM-PKU could you help to check?

[ZYM-PKU]

The other pixels in the image also change because the model generate the whole image rather than only the masked region. The change of brightness or contrast may be due to:

1. The intrinsic gap of the pixel distribution between the real-world images (training set) and AI-generated images (testing cases).
2. The accumulative error in the inference process.