Use case

When creating a ui.Image in the following way:

final buffer = await ImmutableBuffer.fromUint8List(data);
final descriptor = ui.ImageDescriptor.raw(
  buffer,
  width: actualWidth,
  height: actualHeight,
  pixelFormat: ui.PixelFormat.rgba8888,
);
final codec = await descriptor.instantiateCodec();
final frame = await codec.getNextFrame();
return frame.image;

The bitmap is assumed to be sRGB with seemingly no way to make Flutter consider it as Display P3. This is an unfortunate limitation as it means there is no way to pass a raw bitmap from platform to Dart without having it interpreted as sRGB.

Proposal

It would be great to have a colorSpace option so that one could describe the image like such:

final descriptor = ui.ImageDescriptor.raw(
  buffer,
  width: actualWidth,
  height: actualHeight,
  pixelFormat: ui.PixelFormat.rgba8888,
  colorSpace: ColorSpace.displayP3,
);

I have never worked with Flutter internals before, but I may be able to contribute this feature with some guidance on how this could be implemented.