how can I get a list of 1s from a binary image (2d array)

Hi, I am using nested for-loops to extract data, e.g. 1s from a binary image. It is really slow.

does anyone know a better way of doing this?

many thanks.

[Lorenzo Luengo]

Is your image grey? or RGB?

[charlie]

grey

Answer 1

[Walter Roberson]

[r,c] = find(YourImage)