This means that black is the absence of colour. White isn’t actually a colour - it’s a combination of all colours put together. Time for a little physics! Light is made up of many different colours - you probably know that white light is actually all the colours of the visible spectrum (the light that we can see). If you bought a stereo and it came from the factory with the treble and bass turned all the way down, everything would sound terrible! Computer displays aren’t calibrated fully simply because each person will have a different requirement. Just like adjusting the treble and bass of your stereo can fine-tune the sound of your favourite band, the same must be done for your display. Furthermore, as the music will sound different if you’re using large or small speakers in a large room or small room, you must adjust the sound for the space available. If you just bought a new stereo, you’d spend time adjusting all the different features (such as treble, bass or balance) until you hear what you assume is the best possible sound.
If you think of your Mac’s display as similar to a home stereo, calibration is just like adjusting the treble or bass. The reason for this is that your Mac’s display wasn’t giving you an accurate representation of the colours, only a good approximation. What happened? You’ve changed the cartridges in your printer and it’s been thoroughly cleaned, why are the colours looking a little off? Although the photograph looked great on your Mac, some of the colours looked somehow different on the printed photo - the red looks slightly different, almost purple. What is seen on your display and what the image should look like can be two quite different things
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