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

Name
Description
Type
Required

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

Name
Description
Type

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

  1. Drag the Match Alpha node into your graph.

  2. Connect your foreground color (like #5C5656), background color (like #FFF), and reference color (#CFCDCD).

  3. Adjust threshold and precision if needed (defaults are 0.01).

  4. The node outputs the calculated alpha value (0.3) and the semi-transparent foreground color (#5C56564D).

  5. 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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