I have a bit of trouble getting my head around the concept of Calculations. I figured that with some use in practical applications, I would soon understand. I still don't get it.

Chapter 6 of the book.

Making a selection of the Object (Calculations)

Step 5. (p156) "Merge the layers used in the calculation, and rename the result Orchid Selection".

What layers are the actual calculation? I used ALL layers to get to the "result", but I doubt the intent is to flatten the image. Can anyone shed more light on the subject please?

Thanks!

Chapter 6 of the book.

Making a selection of the Object (Calculations)

Step 5. (p156) "Merge the layers used in the calculation, and rename the result Orchid Selection".

What layers are the actual calculation? I used ALL layers to get to the "result", but I doubt the intent is to flatten the image. Can anyone shed more light on the subject please?

Thanks!

## Comment