support alpha channel for 2x 3x models

xinntao / Real-ESRGAN-ncnn-vulkan

NCNN implementation of Real-ESRGAN. Real-ESRGAN aims at developing Practical Algorithms for General Image Restoration.

https://github.com/xinntao/Real-ESRGAN

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Closed tumuyan closed 2 years ago

tumuyan commented 2 years ago

目前使用real-esrganv2 2x模型放大带alpha通道的png，会输出全透明的结果。此pr对此问题进行了修复

xinntao commented 2 years ago

感谢：-）将在CI 通过后merge呐 ~