how do I change the opacity of an image (overall alpha
how do I change the opacity of an image (overall alpha,Transparent (opacity) image from top 0% to bottom 100% in,augmenters.blend — imgaug 0.4.0 documentation,CSSだけでマウスオーバーしたときに画像を白みがかったように,Gradients, Mesh Tool, and Transparency | SpringerLink