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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/ImageData/pixelFormat below:

ImageData: pixelFormat property - Web APIs

This property can have the following values:

"rgba-unorm8" representing RGBA with 8 bit per component unsigned normalized format, using a Uint8ClampedArray.
"rgba-float16" representing RGBA with 16 bits per component, using a Float16Array. Floating-point pixel values allow representing colors in arbitrarily wide gamuts and high dynamic range (HDR).

Examples Floating-point pixel data for wide gamuts and high dynamic range (HDR)

Floating-point pixel values allow representing colors in arbitrarily wide gamuts and high dynamic range (HDR). You can set the pixelFormat setting to "rgba-float16" to use RGBA values with 16 bits per component. This requires the dataArray to be a Float16Array.

let floatArray = new Float16Array(4 * 200 * 200);
let imageData = new ImageData(floatArray, 200, 200, {
  pixelFormat: "rgba-float16",
});
console.log(imageData.pixelFormat); // "rgba-float16"

Specifications Browser compatibility

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