LuminanceFormat reads each element as a single luminance component.
This is then converted to a floating point, clamped to the range [0,1], and then assembled into an RGBA element by
placing the luminance value in the red, green and blue channels, and attaching 1.0 to the alpha channel.
LuminanceFormat reads each element as a single luminance component. This is then converted to a floating point, clamped to the range
[0,1], and then assembled into an RGBA element by placing the luminance value in the red, green and blue channels, and attaching1.0to the alpha channel.