Effect channel determines which HSV channel should be used (bright- ness is generally best). Effect operator controls the direction of the pattern or Figure 25.19 Oilify invoked at the bottom right in the Derivative Shapeburst illustration shows the result of using Derivative instead of Gradient Effect Operator. The Filter Length, Blur image shows what the Radial Blur image would look like using a higher Filter is surrounded by parentheses (). The second thing you need to know is that: • The function name/operator is always the first item in the parentheses, and the rest of the items are parameters to the function

is surrounded by parentheses (). The second thing you need to know is that: The function name/operator is always the first item in the parentheses, and the rest of the items are parameters to the function adding 5 and 6 together: 3 + (5 + 6) + 7= ? ‚‚‚‚‚‚‚‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚ ‚‚‚‚‚‚ Knowing that the + operator can take a list of numbers to add, you might be tempted to convert the above to the following: the same is not true for Scheme. You must have a space after a mathematical operator (or any other function name or operator) in Scheme for it to be correctly interpreted by the Scheme interpreter. Practice

Image Manipulation Program 143 / 653 The second thing you need to know is that: The function name/operator is always the first item in the parentheses, and the rest of the items are parameters to the function and 6 together: 3 + (5 + 6) + 7 = ? GNU Image Manipulation Program 144 / 653 Knowing that the + operator can take a list of numbers to add, you might be tempted to convert the above to the following: the same is not true for Scheme. You must have a space after a mathematical operator (or any other function name or operator) in Scheme for it to be correctly interpreted by the Scheme interpreter. Practice

is surrounded by parentheses (). The second thing you need to know is that: The function name/operator is always the first item in the parentheses, and the rest of the items are parameters to the function wanted to add 3 to the result of adding 5 and 6 together: 3 + (5 + 6) + 7 = ? Knowing that the + operator can take a list of numbers to add, you might be tempted to convert the above to the following: the same is not true for Scheme. You must have a space after a mathematical operator (or any other function name or operator) in Scheme for it to be correctly interpreted by the Scheme interpreter. Practice