[Feature Request] Save Transparency as White When Resizing as JPG

[Jack Lukic]

Thanks for the wonderful project, the webassembly usage is one of the few I've seen in open-source like this and quite brilliant.

Feature Request

Modify default behavior for alpha: false to squash transparencies to white instead of black, or provide a configuration for how to render alpha layers when resizing to non-alpha format like jpg.

Use Case

When you have websites that support image uploads, often times you want to support a variety of image formats like png and gif for uploads, but want the final results to be without alpha layers by removing them in a reasonable way for display. For example when allowing user avatar uploads.

Current Behavior

Resize an image with transparency like

Current Behavior (Squashes to Black)

Requested Behavior (Squash transparency to white)

[Vitaly Puzrin]

That's out of scope. In v9 you have canvas output with correct alpha channel. After resize you can apply any background you wish via canvas api.