can any one tell me the meaning of the following lines

 [index, map]=rgb2ind(I,65300);
pixels= prod(size(index));
hsv=rgb2hsv(map);
h = hsv(:,1);
s = hsv(:,2);
v = hsv(:,3);
darks = find(v <.2)';
lights = find(s < .05 & v  > .85)';
h([darks lights])= -1;
disp(length(darks))
black = length(darks)/pixels;
white = length(lights)/pixels;
red = length(find((h >.9167 | h <=.083) & h~=-1))/pixels;
yellow=length(find(h >.083 & h<=.25))/pixels;
green=length(find(h > .25 & h<= .4167))/pixels;
cyan= length(find(h > .4167 & h<= .5833))/pixels;
blue=length(find(h > .5833 & h <= .75))/pixels;
magenta=length(find(h > .75 & h <= .9167))/pixels;
hold on
fill([0 0 1 1], [0 red red 0], 'r')
fill([1 1 2 2],[0 yellow yellow 0], 'y')
fill([2 2 3 3],[0 green green 0], 'g')
fill([3 3 4 4],[0 cyan cyan 0], 'c')
fill([4 4 5 5],[0 blue blue 0], 'b')
fill([5 5 6 6],[0 magenta magenta 0], 'm')
fill([6 6 7 7],[0 white white 0], 'w')
fill([7 7 8 8],[0 black black 0], 'k')
axis([0 8 0 1])

[Geoff Hayes]

Luna - is there any line in particular that you are questioning or is it all of it? (I noticed that you have referenced this code in a couple of other questions today: question 1 and question 2.)

The best way to figure out what is happening is to step through the code and observe what is happening at each line.

[dpb]

...best way to figure out what is happening is to step through the code and observe...

Preceded by or contemporaneous with reading the documentation for any functions you don't follow and using the examples for them in (generally) simpler conditions.

Answer 1

[Image Analyst]

It's counting the number of pixels with those particular colors.