colorimeter

You can just point the colorimeter to the gba screen bar an angle and shine a high quality light source at it

I'll need to buy a colorimeter to calibrate it correctly.

Most colorimeters also have a projector mode for measuring beamer screens.

Of course it will always be better if you calibrate it yourself using something like a Spyder colorimeter.

The colorimeter at your local paint store, looking at a paint chip from your wall, is very likely going to do a whole lot better than the process you just described.

That study seems dubious -- they mention that they measured free chlorine with a DPD test, and they also say that they measured chloramines with a colorimeter and the DPD test.

As I understand it, colorimeter expect the display to output a particular colour or shade and measure it precisely.

The ColorHug is a colorimeter designed to calibrate screens with an approximately-sRGB gamut.

I think relaying the image with a lens onto the colorimeter should work assuming you modify the game so the hardware displays a full screen equivalent of all possible variations of a single pixel.

Not to rain on your parade but get a colorimeter and check your screen I’ve used my xrite i1 pro and the amount of blue light doesn’t actually change that much when you switch your white point temperature to warmer settings and especially when it’s as high as 5500K.

It hurts me to know that I can't cheaply buy a spectrometer, colorimeter, spectrophotometer, densitometer, spectroradiometer, turbidimeter, or similar.