maptalks.js
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ImageLayer的半透明被设置了两次
maptalks's version and what browser you use?
Issue description
ImageLayer设置opacity时,会出现叠加,比如设置 opacity: 0.5,实际生效的是 0.5*0.5=0.25
Please provide a reproduction URL (on any jsfiddle like site)
https://codepen.io/ydfzgyj/pen/QWPywOW