Review - there are 2 main approaches to rendering algorithms

Rasterization (openGL)
for each object {
	for each pixel in image {
		if object affects pixel {
			// do something
		}
	}
}

Ray tracing/ path tracing
for each pixel in image {
	for each object in scene {
		if object affects pixel {
			// do something
		}
	}
}


Two types of screens that will be discussed are LED/LCD and OLED

LCD - uses a polarizer to block white backlight
OLED - emits Red, Green, Blue

Advantages/Disadvantages
LCD - blocked light tends to seep through

ppi = pixels per inch
Retina Displays = Hi Dpi

"A pixel is not a little square" - Alvin Ray Smith

An image can conceptually by defined as a function I(x,y) -> V where V is the value of a pixel. In other words, a pixel is a sample of a 2D function

Each pixel is represented as a combination of 3 components (red, green, and blue). Each component is represented as a 32-bit (4 byte) floating point number. Therefore, an entire pixel requires 96 bits (12 bytes).

If a pixel has the value (0.25, 0, 0), then does this mean a pixel with the value (0.75, 0, 0) is 3 times as bright? No. How is this solved? It is done through Gama Correction


To do gamma correction, we apply the function
I_{gammacorrected} = I^(1/gamma)
where we usually set gamma = 2.2


Process of doing gamma correction
See http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html#gamma_correction for further notes on gamma correction

It is a standard that the origin (0,0) of an image if the top left corner.