Combine

Top  Previous  Next

 

 

 

Overview

 

This versatile node will combine its inputs in a number of interesting ways.  The combination effects that can be achieved are similar to the various ways that layers can be combined in many popular photo editing applications.

 

 

 

Inputs

 

 

Input

Description

Top

This is the first of the two inputs to be merged together.  This input is named "Top" because it is treated similarly to the top of two layers in a photo editing application.

Bottom

This is the second of the two inputs to be merged together.  This input is named "Bottom" because it is treated similarly to the bottom of two layers in a photo editing application.

Selector

The red channel of this input dictates how strong an effect the first input will have on the second one at each point.  As such, this input will function as a mask.

 

 

 

Properties

 

 

Property

Description

Mode

Specifies how the first two inputs will be combined.  Changing this property can lead to widely varying results.

First Input

When this property is set to "Input 2", the Top and Bottom inputs are internally switched for all processing purposes.  After making a switch here, you should re-experiment with the various Mode settings, as many of them will now yield different results.

Transparency

This property is only useful if at least one of the first two inputs has a meaningful transparency channel.  This property will specify how the transparency of the result is determined:

 

Normal

Most closely mimics the resulting transparency of two semi-transparent surfaces layered on top of each other in the real world.

Product

The transparency channels of the first two inputs are multiplied.

Greatest

For each pixel, the greater of the first two inputs' transparency channels is used.

Sum

The transparency channels of the first two inputs are added.

Top

The transparency of the Top node is taken.

Bottom

The transparency of the Bottom node is taken.

None

The result will have no transparency.

Opacity

This property functions similarly to the Selector input, except that it affects the entire image evenly.  Decrease the value to lower the effect that the Top input has on the Bottom one.

Combine Effect Maps

By default this node only layers the input images while passing any effect maps through unchanged.  However, with the Combine Effect Maps property active, the Combine node will also attempt to layer any corresponding effect maps (the first effect map of input 1 will be combined with the first effect map of input 2, etc).

 

 

 


Page URL: http://www.spiralgraphics.biz/genetica/help/index.htm?combine.htm