MATLAB Answers

Obtaining pixel value from image in GUI

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sha
sha on 18 Oct 2012
Hi,
I would like to obtain a pixel value from any image using a GUI. i have made a few research. and this is all i get,
example:
----------
load flujet;
image (X);
colormap (jet);
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I would like to read the pixel value just like the given example. Please help!
Sha

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Answers (3)

Arthur
Arthur on 18 Oct 2012
You could use imtool for that if you have the image processing toolbox.

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manoj saini
manoj saini on 18 Oct 2012
plz type X(capital X) on command window...........all pixel value will be on front you

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Image Analyst
Image Analyst on 18 Oct 2012
Edited: Image Analyst on 18 Oct 2012
You can call impixelinfo(), if you have the Image Processing Toolbox. This will put up a label in your figure that gives you the x,y (column, row) coordinates and the intensity value(s) of the image. Alternatively you can use ginput(1) to get a coordinate and use
grayPixelValue = imageArray(row, column);
to get the gray level in a gray scale image, or
rgbPixelValue = imageArray(row, column, :);
rgbPixelValue = impixel(imageArray, row, column); % Alternative way.
to get the red, green, and blue intensity values in an RGB image.

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sha
sha on 24 Oct 2012
I think i get mixed up. Colormap does shows the contrast of the image. and i would like to do so on my picture. Please advice me in any ways..
Thanks.
Image Analyst
Image Analyst on 24 Oct 2012
I don't know what that means. What do you consider to be the difference between "image" and "picture". To me, they're basically synonyms. Increasing the contrast on a picture or an image is the same thing.
sha
sha on 24 Oct 2012
Basically, i wanted my image to be like this:
using the colormap command. Any ideas?

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