Calculatorism

Perceived Brightness Calculator

Compute HSP perceived brightness B = √(0.299R²+0.587G²+0.114B²).

Input Data

Input Red R.
Input Green G.
Input Blue B.

Results

128
HSP perceived brightness (0–255).

At a glance:Perceived Brightness Calculator: enter parameters to compute results; complements related calculators.

Formula

B = √(0.299·R² + 0.587·G² + 0.114·B²).

How to Use

  1. Enter R,G,B.
  2. It returns perceived brightness (0–255).

Case Studies

Gray (128,128,128) → B=128

Mid-gray brightness equals its gray value.

FAQ

vs relative luminance?

HSP is a quick approx; WCAG luminance linearizes gamma for accuracy.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Perceived Brightness Calculator（/color/perceived-brightness）。