| Revision: | 1.1 |
| Committed: | Sat Feb 22 02:07:21 2003 UTC (22 years, 2 months ago) by greg |
| Branch: | MAIN |
| CVS Tags: | rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R5, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1 |
| Log Message: | Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release |
| # | Content |
|---|---|
| 1 | { |
| 2 | Calculation of contrast-based scalefactor |
| 3 | |
| 4 | 8/17/93 |
| 5 | |
| 6 | Input: ex = picture exposure |
| 7 | or: Lwa = world adaptation luminance |
| 8 | Output: sf = scalefactor for display |
| 9 | adj = corresponding exposure adjustment |
| 10 | |
| 11 | Optional Inputs: Ldmax = maximum display luminance |
| 12 | Lda = display adaptation luminance |
| 13 | } |
| 14 | Lwa = WE*.5/ex; |
| 15 | Ldmax = 120; |
| 16 | Lda = Ldmax/2; |
| 17 | |
| 18 | sf = ((1.219 + Lda^.4)/(1.219 + Lwa^.4))^2.5 / Ldmax; |
| 19 | |
| 20 | adj = WE*sf/ex; |