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createImageData() ImageData transparent black

ImageData е RGBA

transparent black (0,0,0,0)

color/alpha С ImageData Си ImageDataObject.data.length

color/alpha 洢 ImageData data С

е color/alpha putImageData()

ImageData е

imgData=ctx.createImageData(100,100); imgData.data[0]=255; imgData.data[1]=0; imgData.data[2]=0; imgData.data[3]=255;

ImageData е

imgData=ctx.createImageData(100,100); imgData.data[4]=0; imgData.data[5]=255; imgData.data[6]=0; imgData.data[7]=255; JavaScript

汾 createImageData()

1. 磨 ImageData

var imgData=context.createImageData(width,height);

2. ImageData ImageData

var imgData=context.createImageData(imageData);

width ImageData

height ImageData

imageData ImageData