Lost in "Handle Land"...

I'm trying to index into a clicked image. I first read the image in and then, inside a nested function, I call imshow() :

A = imread('Oiseaux - Fairywren.jpg');

ciediagram_scatter(A);

function ciediagram_scatter(inpict)

imageHandle = imshow(inpict);

set(imageHandle,'ButtonDownFcn',@ImageClickCallback);

In the ImageCallback function, I want to retrieve the RGB values corresponding the clicked x,y coordinates. So I use this code :

CP = round(get (axesHandle, 'CurrentPoint'));

x = CP(1,1)

y = CP(1,2)

IntX = cast(x, 'uint8');

IntY = cast(y, 'uint8');

% Image = 537 High x 360 Wide

% XData: [1 360]

% YData: [1 537]

RGB = inpict(IntY,IntX, :); <<<<< This call works

RGB = imageHandle(IntY,IntX, :); <<<<< This call does NOT work?

Whenever I try to execute the second call above, I invariably receive the following error :

Index in position 1 exceeds array bounds (must not exceed 1).

There must some kind of handle 'dereferencing' I am not doing? But I have no idea how to do this?

Any help is appreciated.

Answer 1

[Steven Lord]

The imshow function creates a scalar image object representing the picture as a whole. That object contains the color data as one of its properties. You will need to index into the CData property of that object.