canvasTools - downloadXXXX
https://mins01.github.io/tool_canvasTools
https://github.com/mins01/tool_canvasTools
#fromImageNode
CanvasTools.download
download PNG
download JPG 0.1
CanvasTools.downloadWithBlob
download PNG
download JPG 0.1
CanvasTools.downloadWithDataURL
download PNG
download JPG 0.1