Tutorials on Equations for Macros

[Mark Oehlschlager]

I've just watched a video introducing the feature of using mathematical equations to design custom Macro operations. Very intriguing. However, I have no idea what variables and expressions are valid. Is there comprehensive documentation somewhere that a newbie could access to learn all there is to know about creating valid expressions?

[John Rostron]

Use the Help facility and enter expressions. This gives (amongst other things) the various values and functions that can be used in equations. I use these a lot with the Filters > Distort > Equations to modify images.

You might like to search the Tutorials or the Resources forums using the Search word Macro. A few of  these contributions give the text of the macro so that you can see how the expressions are used.

When using Equations, the field for entering expressions/equations has the useful facility of displaying any incorrectly formed expression/equation in red.

John