Export bitmap images as JPG's
Bitmap assets can only be exported as PNG and for some reason as SVG. File size is crucial in web development
Ive found that if my asset has Any transparencies then it exports as a PNG, if you remove the transparency then it becomes a JPG
Erik Gelderblom commented
It'd be great if all export sizes and file formats defined on the layer would be exported too. For an example take a look at how InVision auto generates all assets in the projects assets folder.
Carl Cooper commented
Not only should it output in JPG, it should optimize the file with something like tinypng or imageoptim.