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how to make a programme for colors value from image?

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Dilshad Ahmad
Dilshad Ahmad 2016-9-23
评论： Dilshad Ahmad 2016-9-26
It is my final project , I want to make a programme that take image from user when user click on image the programme give RGB value from image.

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Massimo Zanetti
Massimo Zanetti 2016-9-23
Hi Dilshad, what you want is very simple. Follow this code.
%load image from Matalb demo images (or load your own color image)
rgb = imread('peppers.png');
%display it on the screen
image(rgb);
Now, if you look in the toolbar in the Figure containing your image, you will find an icon "Data Cursor". Press on it and then select a pixel in the image. You will finally read the X,Y coordinates of the pixel you selected and its RGB values in a pop-up window. Hope it helped. Max
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Massimo Zanetti
Massimo Zanetti 2016-9-26
Ok, then you will need something like this one maybe.
img = imread('peppers.png');
h = imshow(img,[]);
hText = impixelinfoval(gcf,h);
set(hText,'FontWeight','bold');
set(hText,'FontSize',10);
This will give you information about any pixel over which you are pointing the mouse on (without clicking on it).

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Image Analyst
Image Analyst 2016-9-23
Simply call impixelinfo() to see the image (x,y) and intensity value as the user mouses around over the image.
hp = impixelinfo();
Or if you want to have them click on a point:
uiwait(helpdlg('Click on a point'));
[x, y] = ginput(1);
pixelValue = impixel(yourImage, round(x), round(y))
Or you can use imtool(yourImage) to bring up a GUI where the user can do even more.

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