Colour is electromagnetic radiation called the visible spectrum. Light is invisible and we only see the colours of objects the light reflect from.
HSL
Hue – the actual colour like the three primary colours:
R – red
G – green
B – blue
all colours are made by combining these three colours
Saturation – the amount or intensity of colour present
Luminance – refers to the brightness of the colour – when you turn up the brightness control on your phone, you are adjusting the luminance.
Contrast – removes some middle colours – increases blacks and whites – makes images pop
File formats
Raw file – an unprocessed image from your computer, usually a large amount of megapixels
jpg – stands for Joint Photographic Experts Group – usually about a third the size of a raw file.
is a lossy file – a photo file that is compressed, every time you save and share a jpg file, you loose a little quality
and edited by the camera
the camera adjusts exposure, brightness, enhances colours
JPG 2000 – meant to replace jpg but it never caught on because of copyright issues