gradient image of multi -spectral image

http://www.mathworks.in/matlabcentral/fileexchange/32623-gradient-image-of-multi-spectral-image/content/colgrad.m

when i tried this code for color gradient in RGB ,i faced a problem.

atan() function gives us range from(-pi,pi).

if(teta<0.0)

teta=teta+2*pi;

and to convert (0,360) degree i do

teta=teta*180/pi;

but this does not give me satisfactory result.

i want a angle matrix mean 'teta' has value (0,360) degree

[Amith Kamath]

Have you tried contacting the author of this code?

Answer 1

[Walter Roberson]

Have you considered using atan2() ?

[preet]

i m using atan()

[Walter Roberson]

I am aware of that. But if the information is available then atan2() is more appropriate.