Step 1: WHAT YOU WILL NEED:

A basic camera with good macro.

A computer. Retina display works best

An app that can crop images. (most modern cameras have this inbuilt.)

Step 2: Take a Few Macro Pics of the Screen.

WHITE SCREENS WORK BEST.

Make sure they are in perfect focus, otherwise the cropping app won't work.

This picture is of the reminders icon on Apple high sierra.

Crop the image to about 10x or more. you should see red blue and green pixels blending together

to make white.

HAVE FUN .