Sending image data to arduino mega with led matrix

Other Hardware LEDs and Multiplexing
1

Hi everyone!
my goal is to make a led matrix display low res output from a webcam by sending the data via python using the pyserial library. I am very comfortable with python and wouldn't have any issues formatting the data and sending it, it's just receiving the data from serial that is confusing to me, which is because I am quite rusty with C and C++ (I only have education in C and Python)
Here is my pseudo code:

make a char array of 3 * the number of pixels //three char per pixel 
//the python code might send the image as a series of each pixels color val, ex: <r0,g0,b0,r1,g1,b1,r2,b2,g2,...rn,gn,bn>
//all sent on one line, not separated by commas.
loop
    count = 0
    got_something = false
    while serial is available
        //get a byte
        pre_allocated_char_array[count] = serial.read()
        count ++
        got_something = true
    if got_something
        c equivalent of 'for i in range (number of pixels)'
            char color[3];
            for j in range 3
                color[j] = pre-allocated-array[i + j]
            set pixel i to color

does this algorithm make sense before I start?

2

Does this help:
Serial input basics ?

You do know a Mega has 8k of SRAM, you are not going to get much of an image in that.