Return a 32-bit integer pixel value given separate red, green, blue, and alpha values.

Each r, g, b, a value is an integer between 0 and 255.

You probably want to use TargaBase#get_row_rgb or TargaBase#get_row_rgba instead.

You probably want to use TargaBase#put_row_rgb or TargaBase#put_row_rgba instead.

Given a 16-bit integer colour value, return separate [r, g, b, a] values.

Each r, g, b, a value is an integer between 0 and 255.