color content at i,j

pagan — Fri, 05 Mar 2010 22:36:01 Z

Do you mean that you want the RGB values (say) for a given i,j pixel, so as to check whether it is zero-triple.

C[i,j,1..3]; # 1D Array of all three color layers values at i,j

LinearAlgebra:-Norm(<C[i,j,1..3]>);

You could use C[i,j] instead of C[i,j,1..3]. But the key is to use something other than an equality test against a list or zero-Vector while using the equals-sign.

Instead, you could test against a triple-zero-Array using ArrayTools:-IsEqual, or against a triple-zero-Vector using LinearAlgebra:-Equal, or against scalar zero after applying LinearAlgebra:-Norm. (These were all suggested recently in another thread.)

The command

juan.navarro — Mon, 08 Mar 2010 21:29:39 Z

The command ArrayTools[IsZero] seems to work fine. Thank you for the suggestions

That is correct. I am

juan.navarro — Fri, 05 Mar 2010 22:33:03 Z

That is correct. I am looking for black pixels in an image, hence the if statement

MaplePrimes - answers and comments on Question, Picture channel's content

color content at i,j

The command

That is correct. I am