Match Alpha
What It Does
The Match Alpha node calculates the opacity value needed to blend a foreground color with a background color to match a reference color. It reverse-engineers the alpha value that would create the target color.
Inputs
Foreground
The color to apply transparency to
Color
No
Background
The background color for blending
Color
No
Reference
The target color to match
Color
No
Threshold
Maximum allowable color difference (0-1)
Number
No
Precision
Calculation precision for alpha value
Number
No
Outputs
In Range
Whether a valid alpha value was found
Boolean
Color
The foreground color with the calculated alpha
Color
Alpha
The calculated alpha value (0-1)
Number

How to Use It
Drag the Match Alpha node into your graph.
Connect your foreground color (like
#5C5656
), background color (like#FFF
), and reference color (#CFCDCD
).Adjust threshold and precision if needed (defaults are 0.01).
The node outputs the calculated alpha value (0.3) and the semi-transparent foreground color (
#5C56564D
).If "In Range" is false, no suitable alpha value could be found.

Tips
Lower threshold values require more exact color matching.
If no suitable alpha is found, try different foreground and background colors.
This node works best when the reference color is between the foreground and background colors.
See Also
Flatten Alpha: For the reverse operation - merging a transparent color with a background.
Contrasting Alpha: For finding alpha values that maintain contrast requirements.
Use Cases
Color System Analysis: Discover the transparency values used in existing designs.
Overlay Recreation: Recreate the exact transparency of an existing overlay or glass effect.
Color Harmonization: Find transparency values that harmonize colors in a composition.
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