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Knowledge Base: ProPresenter Modules
Edge Blend Module Instructions for ProPresenter
Posted by Renewed Vision Support on March 26, 2011 at 05:05 PM
Updated by Renewed Vision Support on Aug 13, 2015
The Edge Blending Module requires a Matrox DualHead2Go or TripleHead2Go to work. You can find instructions for setting up these devices here.
The Edge Blending module makes it easy and affordable to use edge blending in your environment. Edge blending consists of two or three overlapping projected images that have the overlapping regions adjusted to create a seamless blend. Because the outputs of each projector have to overlap in order for blending to occur, the actual width of your output will be smaller than the output resolution.
Once you have properly configured your computer and ProPresenter to work with double-wide or triple-wide media, you can configure the Blend module.
To start, check both the Enable Data and Enable Blending boxes. Select the number of projectors (two or three) that you are going to be using. To get started, you can enter the number of screens as your Screen Size, however, entering the final screen width in inches will give you a more precise blend. The Blend Area and Total Blend need to be positive values, so if they aren’t, double-check the screen resolution settings.
The lower section is used to adjust your blend areas. The black-and-white box is actually the representation of the curve being used to apply the blending adjustments. The three options--Linear, Cubic, and Quadratic--will result in slightly different blends. Test each option to see which works best for you since this varies depending on projectors and environmental factors.
The four sliders allow you to adjust the values of the blend. You will need to spend some time working with these to get the best blend you can. It’s recommended that you start with the first two sliders, Blend and Intensity, at 100% to help you establish a good baseline for adjusting your blend. Gamma adjusts the brightness of the non-blended are compared to the blended regions. If you find that your blended areas are brighter than the rest of your screen, you will want to adjust this settings. Black Level adjusts the video black brightness. Since a projector doesn’t display black, the brightness between the blended area and the rest of the screen may vary slightly.
You will want to use the blend grid to help you align your projectors and get them as perfectly aligned as possible before adjusting the blend settings. Getting the alignment perfect is critical to being able to achieve the best edge blend possible. If your projectors are slightly out of alignment, your blended area may be visible.
Due to the wide range of projects and their quality, achieving a “perfect” edge blend is quite difficult, even for the most skilled person. Due to many factors such as quality of the projectors, age of the lamps in the projectors, number of hours each projector has been used, and even the brand of the lamps in the projector, you may still see a slightly visible area where the images overlap. This occurs with any edge blending solution.
If you aren’t familiar with edge blending, you may want to watch the tutorial on our website.