ModelFieldImage shows a black bg when PNG file is chosen

[leolynn]

ModelFieldImage shows a black background when selecting a PNG file. In ImageService, the PNG file is passed as a jpeg type in data URL.

[tma-isbx]

Specifically, a PNG with transparency. I think the canvas need a background color filled in with a default color.

[leolynn]

Yup, but in ImageService line 54, the data is always returned as a flat jpeg file so there's no way to fill the background color.