Revision: | 1.2 |
Committed: | Wed Nov 21 18:10:45 2018 UTC (5 years, 6 months ago) by greg |
Branch: | MAIN |
CVS Tags: | rad5R4, rad5R3, HEAD |
Changes since 1.1: | +1 -0 lines |
Log Message: | Added missing RCSid tag |
# | User | Rev | Content |
---|---|---|---|
1 | greg | 1.2 | { RCSid $Id$ } |
2 | greg | 1.1 | { |
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; |