Eyeon:Script/Reference/Applications/Fuse/Classes/Image/GetPixel

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Contents 1 Summary 2 Usage 3 Example 4 Tips for GetPixel (edit)

Summary

The GetPixel function is used to retrieve the values of a specific pixel in an Image. This uses actual pixel co-ordinates, and must always be within image bounds.

Usage

Image:GetPixel(integer x_position, integer y_position, object pixel)

x_position

The position of the pixel to get on the x axis

y_position

The position of the pixel to get on the y axis

pixel

The Pixel object that will receive the color values of the image's pixel.

Example

A simple 8 bit histogram function

	local p = Pixel()
	local histoR = {}
	local histoG = {}
	local histoB = {}
	local histoA = {}
	local r,g,b,a
 
	-- initialise the histogram table
	for i = 0,255 do
		histoR[i] = 0
		histoG[i] = 0
		histoB[i] = 0
		histoA[i] = 0
	end
 
	for y=0,Height-1 do
		if self.Status ~= "OK" then break end
		
		for x=0,Width-1 do
			img:GetPixel(x,y, p)
 
			-- convert float 0..1 values into int 0.255
			r = math.floor(p.R * 255)
			g = math.floor(p.G * 255)
			b = math.floor(p.B * 255)
			a = math.floor(p.A * 255)
 
			-- check for out-of-range colors
			if r >= 0 and r <= 255 then histoR[r] = histoR[r] + 1 end
			if g >= 0 and g <= 255 then histoG[g] = histoG[g] + 1 end
			if b >= 0 and b <= 255 then histoB[b] = histoB[b] + 1 end
			if a >= 0 and a <= 255 then histoA[a] = histoA[a] + 1 end
		end
	end

Tips for GetPixel (edit)

EyeonTips:Script/Reference/Applications/Fuse/Classes/Image/GetPixel