The syntax follows the convention of var varname=function()
Function results can be assigned to variables in order to streamline the overall expression and aid readability. To target just the alpha channel data, disable R, G and B and enable A. To target all colour data cumulatively, enable R, G and B but not A. Channel targeting is an important part of achieving the desired result from the expression. You can click on the R, G, B and A channel labels to add or remove them from the expression. When you create a new expression line, just the channel red ( R) is targeted by default, meaning only the red channel data is affected by the outcome of the expression. Multiple line entries are typically used to target separate channels-if you are targeting all channels simultaneously then you would only need one entry. The equation line entries are where you type the expressions and functions to achieve the desired result. The filter has several key components that must be understood in order to use it effectively: Elevation-Rotation Input-direction-based vector input. Angle Input-angle input, used with vector expressions. Integer Number Input-numerical input limited to integer values. Real Number Input-actual number value with no limit. -1-1 Range Input-a harmonic input range (useful for harmonic functions). 0-1 Range Input-a standard input range. 
You can use the following variable types:
Custom Inputs-add custom input variables here. You can also target specific channels by clicking the channel buttons to the right of the equation entry. This is where you write the functions to manipulate the pixel content. Equations-you can define multiple equation lines. The following settings can be adjusted in the filter dialog: It can be accessed via the Layer menu, from the New Live Filter Layer category. This filter can be applied as a non-destructive, live filter. A bump map is created from a normal map using dot and debump functions, then a Soft Light blend mode is used to "relight" a 3D render.
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