Test image: bump and hill

A simple test image useful to try various algorithms of gradient, edge detection,...



The test image of Fig. 1 is calculated from the following formula taken from [MathWorks]

v = x * exp^{(-x2 - y2)} with x ∈ [-2;+2] and y ∈ [-2;+2]

with the following IJ script using the function Process > Math > Macro...

in="test";
newImage(in, "32-bit Black", 256, 256, 1);
formula="[v=(x/64-2)*exp(-(x/64-2)*(x/64-2) -(y/64-2)*(y/64-2))]";
run("Macro...", "code="+formula);

Fig.1: Test image

And now in 3D using the tool Plugins > 3D > Interactive 3D Surface Plot 

Fig.2: Test image viewed in 3D with a Thermal LUT