Serial Digital » edge-blending http://www.serialdigital.com Notes on presentation graphics and vision systems Sat, 06 Aug 2011 00:31:10 +0000 en hourly 1 http://wordpress.org/?v=3.3 Edge blending with single chip DLP projectors http://www.serialdigital.com/2009/01/19/edge-blending-with-single-chip-dlp-projectors/ http://www.serialdigital.com/2009/01/19/edge-blending-with-single-chip-dlp-projectors/#comments Mon, 19 Jan 2009 00:21:10 +0000 Steve Wylie http://www.serialdigital.com/?p=109 I recently visited the Australian War Memorial in Canberra and watched two presentations which looked to be Watchout or Wings content across three projectors each.

Australian War Memorial Projection Exhibit

Australian War Memorial Projection Exhibit

The second, newer presentation looked (from a distance) to be using projectiondesign F30 projectors, and the image (mostly 3D animation) looked pretty good – however I did notice the gamma ramp in the blend region, which prompted me to comment on using single chip DLP projectors for edge blending.

The projectiondesign single chip DLP’s have a setting called ‘Color Boost’, which is designed to push the gamma curve settings to get the punchiest image from the projector – but at the cost of accurate colour and gradient representation.

This seriously affects an edge blend, as the gradient between projectors appears ‘stepped’ rather than smooth:

Smooth Blend

Smooth Blend

Steppend Blend

Steppend Blend

In my experience, when using a single chip DLP projector for edge blends, any colour boost or image/level management features should be disabled so the image appears ‘natural’ – even if this costs light output.

On the projectiondesign F30 units, I have found that setting the ‘Color Boost’ feature to ‘3’ will give an adequate balance between accuracy and intensity.

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