Scatter plot for two 3D images

How can i do a scatter plot applied to two 3D images? I mean, I want to compare the values of 2 3D-images putting them on a scatter plot? Anyone could help me?

[Ben11]

By '3D images' do you mean RGB images? If not what kind of images are they?

[Ashish Gudla]

If by putting on scatter plot and compare you mean you want to plot both onto a single figure you can use "hold on" between your scatter3 calls which would plot the points onto the same axes.

Example:

>> scatter3(x1,y1,z1);
>> hold on
>> scatter3(x2,y2,z2);

[Image Analyst]

You would not plot every voxel value with a scatter plot. So...

What do the three dimensions represent? RGB values? Distances along the x,y,z directions? Something else??? How many data points are to be plotted?