Convert to Grayscale

public void grayscaleWithLuminance$()$

Pixel$[]$ pixelArray $=$ this getPixels$()$;

Pixel pixel $=$ null;

int luminance $0$;

double redValue $0$;

double greenValue $=0$;

double blueValue $=0$;

for $($int i$=0$; i $<$ pixelArray.length; i$++)$

pixel $=$ pixelArray$[$i$]$;

$//$ compute the intensity of the pixel $($average value$)$

luminance $=($int$)(($redValue $+$ greenValue $+$ blueValue$)/3)$; pixel.setColor$($new Color$($luminance$.$luminance.luminance$))$;

$\}$

$\}$

explain the code kinfldly