Description
Require tokenAlpha and groupOpacity in [0, 1] and multiply them for effectiveAlpha.
Opacity controls how much a layer contributes to compositing; coverage describes how much area is marked. Overlapping transparent layers therefore require an overlap or compositing model rather than simply adding every percentage.
Require tokenAlpha and groupOpacity in [0, 1] and multiply them for effectiveAlpha.
When to use this tool
Use Color Token Opacity Product when you need a bounded opacity calculation or a coverage budget under a stated overlap model.
How to use the tool and how it works
- Enter tokenAlpha, groupOpacity. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read effectiveAlpha. Use the output convention below.
Require tokenAlpha and groupOpacity in [0, 1] and multiply them for effectiveAlpha.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| tokenAlpha | Token Alpha | Required. Finite number; minimum 0; maximum 1. |
| groupOpacity | Group Opacity | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| effectiveAlpha | Effective Alpha | Required. Finite number. |
{
"input": {
"tokenAlpha": 0.5,
"groupOpacity": 0.4
},
"output": {
"effectiveAlpha": 0.2
}
}Limitations and assumptions
- This is one scalar opacity component rather than full group compositing, color blending, mask evaluation, or rendered appearance.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Render the actual layers for color and appearance checks. For area coverage, measure their geometric union and intersection when the supplied overlap model is insufficient.
References
Similar or alternative tools
- Design Token Alpha Overlap Opacity Term
Multiply complementary transparencies for two or optionally three layers and return one minus that product as combinedAlpha.
- Spot Color Tint Ink Coverage Term
Sum areas, sum area times tint for solidEquivalentArea, and multiply that equivalent by one plus wasteFraction.