Barco 7QP, User Manual

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7. Advanced
7.8.11.1 Description
What is Gray Level De fi nition?
When matching multi channel systems, the white level can be matched using Dynacolor and the black levels can be tweaked
using Black Color Matching . When comparing the gray levels of certain projector platforms there can be a signi fi cant difference in
the primary color distribution on different gray levels. This is typically the case for LCD and LCoS projectors; especially when they
reach a certain age they are more sensitive to this artifact.
GLD adjustment allows correcting the gray levels by tweaking the contribution of the primary colors to each gray level (i.e. color
balancing).
How does Gray Level De fi nition work?
GLD allows you to adjust the contribution of the primary colors to different gray levels — or zones — to match different display
channels to a reference channel.
Applying a correction in a certain zone also in fl uences the adjacent zones.
The hierarchical levels are selected in a way that the fi rst hierarchy level in fl uences the entire transition from black to white (0% to
100%) with the main correction done at 25%. Below you can fi nd the table of the hierarchy levels and their in fl uence zone.
Hierarchy level (value 1–4) Hierarchy level (%) Gray level range
1 25.0% 0.0% - 100.0%
6.3% 0.0% - 25.0% 2
56.3% 25.0% - 100.0%
1.6% 0.0% - 6.3%
14.1% 3.6% - 25.0%
39.1% 25.0% - 56.3%
3
76.6% 56.3% -100.0%
0.4% 0.0% - 1.6%
3.5% 1.6% - 6.3%
9.8% 6.3% - 14.1%
19.1% 14.1% - 25.0%
31.6% 25.0% - 39.1%
47.3% 39.1% - 56.3%
66.0% 56.3% - 76.6%
4
87.9% 76.6% - 100.0%
The % values in the table indicate measurable brightness on the screen.
208 R59770330 SIM 7QP SERIES 07/10/2013