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creating the data

To start we will be creating a 100 x 100 8 bit image.
This image will use 3 colour channels for red/green/blue, so we will require a array thats 3 x 100 x 100.

local numluau = require("@numluau")
-- makes print out more readable
numluau.set_printoptions({ precision = 2, suppress = true }) 

local WIDTH = 100
local HEIGHT = 100
local MAX_RGB = 0xFF
local image: numluau.ndArray<number> = numluau.zeros(3, HEIGHT, WIDTH)

For now we'll just make this image all magenta.

local R = image[1]
local G = image[2]
local B = image[3]

R[":"] = MAX_RGB
G[":"] = 0
B[":"] = MAX_RGB
source code 
local numluau = require("@numluau")

-- makes print out more readable
numluau.set_printoptions({ precision = 2, suppress = true }) 

local WIDTH = 100
local HEIGHT = 100
local MAX_RGB = 0xFF
local image: numluau.ndArray<number> = numluau.zeros(3, HEIGHT, WIDTH)

local R = image[1]
local G = image[2]
local B = image[3]

R[":"] = MAX_RGB
G[":"] = 0
B[":"] = MAX_RGB