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From: Faiz Ali on 21 Apr 2010 06:13
clear all;
RGB = imread('im5.jpg');

f1 = figure(); imshow(RGB);

[r c z] = size(RGB);
RGB = RGB(floor(r*0.2):r,:,:);
[r c z] = size(RGB);
I = zeros(r,c);

for i=1:r
for j=1:c
if((RGB(i,j,1)>100 && RGB(i,j,1)<250)&&(RGB(i,j,2)>50 && RGB(i,j,2)<180)&&(RGB(i,j,3)>0 && RGB(i,j,3)<100))
I(i,j)=1;
end
end
end


this is a code which read image pixel wise, and changes yellow pixels to white and rest to black. I want to change color of all pixels to black except white. White should remain as white and rest all pixels should change to black.
Can somebody plz help me?
From: ImageAnalyst on 21 Apr 2010 06:48
If RGB = [255,255,255] then just set I to 255 for white, or to 0 for
black (if the color is anything other than [255,255,255].
From: Salim Azak on 21 Apr 2010 07:06
[r c z] = size(RGB);
for i=1:r
for j=1:c
if (RGB(i,j,1)==255 && RGB(i,j,2)==255 && RGB(i,j,3)==255)
break % if it's value is white, do not change
end
RGB(i,j,1)=0; RGB(i,j,2)=0; RGB(i,j,3)=0; % change value out of white
end
end


I hope this code solve your problem.
From: Walter Roberson on 21 Apr 2010 11:16
Faiz Ali wrote:

> this is a code which read image pixel wise, and changes yellow pixels to
> white and rest to black. I want to change color of all pixels to black
> except white. White should remain as white and rest all pixels should
> change to black.

I gave you a reply 14 hours before, in your thread 'CHANGING COLORS'. If
my method was not suitable for your images, you could have replied
there, along with clarification of the points that I indicated you had
not told us about. The one line of code I presented there to do the job
would be fine after you had used im2double() to convert your uint8 image
to double precision -- a possibility that I specifically mentioned in my
response.
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