Channel Merge
Combines up to four single-channel images into one RGBA image, with per-channel fill defaults for any unconnected input.
Channel Merge takes up to four single-channel inputs (R, G, B, A) and assembles them into a single RGBA image. Each input is optional: when a channel is unconnected, it’s filled with a per-channel constant (Zero, One, or a custom value of your choice from 0 to 255).
Defaults are 0 for R/G/B and 255 for A, so wiring just one channel produces a usable image instead of garbage. At least one input must be connected, and all connected inputs must share the same dimensions; the output matches that size.
This is the natural inverse of Channel Split, and it also accepts the single-channel output of nodes like Mask From Image, Mask Paint, Mask Refine, Magic Wand, or Color Range.
Parameters
Section titled “Parameters”Red Channel
Fill when R input unconnected: Zero/One/Custom
Custom fill value (only when `r_fill_mode == 2`)
Green Channel
Fill when G input unconnected: Zero/One/Custom
Custom fill value (only when `g_fill_mode == 2`)
Blue Channel
Fill when B input unconnected: Zero/One/Custom
Custom fill value (only when `b_fill_mode == 2`)
Alpha Channel
Fill when A input unconnected: Zero/One/Custom
Custom fill value (only when `a_fill_mode == 2`)
Usage Tips
Section titled “Usage Tips”- Pair with Channel Split to operate on individual channels and recombine. For example, blur only the alpha or curve only the red channel.
- Wire a single channel into R and leave G/B/A on defaults to view that channel as a red-on-black RGBA image.
- Build a normal map by wiring three different processed channels into R, G, B with A defaulted to 255.
- Use Custom fill with a specific value (e.g. 128) to set a channel to a fixed neutral instead of pure black or white.