An example of Roblox's new DynamicImage class, written by ChatGPT. Note: DynamicImage must be a child of ImageLabel, or else the game will crash

DynamicImage.lua

-- Create a new DynamicImage
local dynamicImage = Instance.new("DynamicImage")

-- Set the size of the dynamic image
local imageSize = Vector2.new(512, 512)
dynamicImage.Size = imageSize

-- Parent the dynamic image to the workspace or another GUI element
dynamicImage.Parent = script.Parent -- MUST BE AN IMAGELABEL - WILL CRASH IF NOT

-- Function to draw a checkerboard pattern
local function drawCheckerboard()
	local pixels = {}
	for y = 1, imageSize.y do
		for x = 1, imageSize.x do
			-- Alternate between white and black squares
			local color = (x + y) % 2 == 0 and Color3.new(0, 0, 0) or Color3.new(1, 1, 1)
			table.insert(pixels, color.r)  -- Red channel
			table.insert(pixels, color.g)  -- Green channel
			table.insert(pixels, color.b)  -- Blue channel
			table.insert(pixels, 1)        -- Alpha channel (fully opaque)
		end
	end

	-- Write the pixel data to the dynamic image
	dynamicImage:WritePixels(Vector2.new(0, 0), imageSize, pixels)
end

-- Draw a checkerboard pattern on the dynamic image
drawCheckerboard()