| Revision: | 1.2 |
| Committed: | Wed Nov 21 18:10:45 2018 UTC (5 years, 5 months ago) by greg |
| Branch: | MAIN |
| CVS Tags: | rad5R4, rad5R3, HEAD |
| Changes since 1.1: | +1 -0 lines |
| Log Message: | Added missing RCSid tag |
| # | Content |
|---|---|
| 1 | { RCSid $Id$ } |
| 2 | { |
| 3 | Calculation of contrast-based scalefactor |
| 4 | |
| 5 | 8/17/93 |
| 6 | |
| 7 | Input: ex = picture exposure |
| 8 | or: Lwa = world adaptation luminance |
| 9 | Output: sf = scalefactor for display |
| 10 | adj = corresponding exposure adjustment |
| 11 | |
| 12 | Optional Inputs: Ldmax = maximum display luminance |
| 13 | Lda = display adaptation luminance |
| 14 | } |
| 15 | Lwa = WE*.5/ex; |
| 16 | Ldmax = 120; |
| 17 | Lda = Ldmax/2; |
| 18 | |
| 19 | sf = ((1.219 + Lda^.4)/(1.219 + Lwa^.4))^2.5 / Ldmax; |
| 20 | |
| 21 | adj = WE*sf/ex; |