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I get black picture when convert to bmp #21

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shichengcn opened this issue Sep 7, 2017 · 0 comments

shichengcn commented Sep 7, 2017

I try to convert img to bmp format
but if not running this at the very beginning

context.fillStyle = '#ffffff';
context.fillRect(0, 0, canvasWidth,canvasHeight);

Then it will convert to one black picture

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