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nagadomi / waifu2x

Image Super-Resolution for Anime-Style Art
http://waifu2x.udp.jp/
MIT License
27.53k stars 2.71k forks source link

Transparent image with black pixels turned into completely black image #339

Open Swanty opened 4 years ago

Swanty commented 4 years ago

Steps to reproduce:

  1. Go to photopea.com
  2. Create new image 500x500 with transparent background
  3. Place black rectangle in center
  4. Export as PNG
  5. Upload exported PNG to waifu2x
  6. Download
  7. Whole image is pure black :cry:
Swanty commented 4 years ago

Test images that turn completely black

(created with photopea.com) New Project (7)

(found on net) 1200px-Converse_logo svg

Swanty commented 4 years ago

If I convert the Color Type of that converse image to Grayscale then waifu2x works okay. Original image Coor Type is RGB and that gets turned into pure black

nagadomi commented 4 years ago

The above test image is Bilevel color with alpha channel. I hadn't thought about this kind of format.