background upsampler used in the online demo

[maopian2333]

hi, thanks for your awesome work! I try the online demo, the results are awesome. Then i download the code and run the inference pipeline with the default model ('https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.1/RealESRGAN_x2plus.pth'), the results seem a little worse than the online demo, mainly on the background. Could i know the background upsampler used in the online demo?

[wzhouxiff]

The ESRGAN model used in the online demo is https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.5.0/realesr-general-x4v3.pth.