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getImageData()返回全0 - IT宝库

getImageData (0, 0, img.naturalWidth, img.naturalHeight); // imgData contains r,g,b,alpha values. We skip // the alpha value. for (var i = 0, ...

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查詢 「getImageData」的人也找了：

  1. getImageData
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  7. failed to execute 'getimagedata' on 'canvasrenderingcontext2d': the source width is 0.
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  8. ImageBitmap
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