RGB
This is actually RGB24 meaning there are 24 bits or 3 Bytes available
for each pixel. It is a packed format, each component is 1 byte large.
The size of the image is Width*Height*3.
The memory layout is
___________________________________
|__R__|__G__|__B__|__R__|__G__|__B__| ....
\_______________/ \_______________/
Pixel(0,0) Pixel(1,0)