What happens when a channel gets separated?

[snibgo]

Wikipedia shows the same process as IM "-separate":

Code: Select all

for (var i = 0; i < data.length; i += 4) {
    var grayscale = data[i];
    data[i]     = grayscale; // red
    data[i + 1] = grayscale; // green
    data[i + 2] = grayscale; // blue
}

[fmw42]

OK. So your javascript needs all 3 channels the same. But where do you save the file to disk and in what format?

[baxter stockman]

I post it back to the canvas and then save it as a png:

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var dataURL = canvas.toDataURL('image/png');

[baxter stockman]

@snibgo: so does that mean a channel separation is just taking one value and then using the same value for all three channels?

[snibgo]

Yes.