a large number of pixels and find out where on the brightness/darkness scale those pixels are. • Std Dev (Standard Deviation) is how homogeneous the pixel spike height is in a certain range. It tells Let’s start out easy, and add some numbers: (+ 3 5) Typing this in and hitting Return yields the expected answer of 8 in the center win- dow. Now, what if we wanted to add more than one number? The “+” function can take two or more arguments, so this is not a problem: (+ 3 5 6) This also yields the expected answer of 14. So far, so good — we type in a Scheme statement and it’s executed immediately in

Let’s start out easy, and add some numbers: (+ 3 5) Typing this in and hitting Enter yields the expected answer of 8 in the center window. Figure 13.3 Use Script-Fu Console. 184 CHAPTER 13. SCRIPTING function can take two or more arguments, so this is not a problem: (+ 3 5 6) This also yields the expected answer of 14. So far, so good — we type in a Scheme statement and it’s executed immediately in the node: While pressing Shift-Ctrl key combination, point to a handle. The pointer doesn’t turn to the expected - and remains a hand. Click to delete the handle. Caution No warning before removing a node, a

Let’s start out easy, and add some numbers: (+ 3 5) Typing this in and hitting Enter yields the expected answer of 8 in the center window. Now, what if we wanted to add more than one number? The ‘+’ function function can take two or more arguments, so this is not a problem: (+ 3 5 6) This also yields the expected answer of 14. So far, so good -- we type in a Scheme statement and it’s executed immediately in node: While pressing Shift-Ctrl key combination, point to a handle. Pointer doesn’t turn to the expected - and remains a hand. Click to delete the handle. Caution No warning before removing a node, a

b o o k 2 o d f (+ 3 5) ‚‚‚‚‚‚‚‚ ‚ ‚ ‚‚‚‚‚‚ Typing this in and hitting Enter yields the expected answer of 8 in the center window. Now, what if we wanted to add more than one number? The "+" more arguments, so this is not a problem: (+ 3 5 6) ‚‚‚‚‚‚‚‚ ‚ ‚ ‚ ‚‚‚‚‚‚ This also yields the expected answer of 14. So far, so good -- we type in a Scheme statement and it's executed immediately in