Barco MCM-400 HFR User Manual page 130

10. Expert operation
How does Electronic Soft Edge blending work?
The process of Soft Edge blending involves electronic manipulation of individual pixels to ensure the correct intensity depending on
its position in the specified blend zone. While adjusting Soft Edge a bitmap is created, having the native resolution of the projector.
The value of each pixel of the image to be projected is multiplied by the value of the corresponding pixel on the bitmap before it is
displayed. This bitmap is called the internal Alpha Plane.
By performing Black Level adjustment, another bitmap is created, again having the native resolution of the projector. The value of
each pixel on the bitmap is added to the value of the corresponding pixel of the image to be projected before it is displayed. This
bitmap is called the internal Beta Plane.
The advanced Soft Edge user interface in the OSD makes it possible to create the correct shape of the Soft Edge area in a flexible
way. By using the Black Level user interface, only pixels outside the overlap areas as defined with the Soft Edge user interface are
changed.
External Alpha and Beta Planes
It is also possible to create your own Alpha Plane and Beta Plane and upload it to the projector. These "external" planes must meet
some rules:
• The bitmap resolution must be 2048 x 1080 pixels; it is scaled up to 4096 x 2160 in the projector;
• Only one Alpha Plane and one Beta Plane can be stored in the projector. Uploading an Alpha Plane or a Beta plane overwrites
the original one if it was present;
• The external Alpha Plane must have exactly this name: alpha.tiff;
• The external Beta Plane must have exactly this name: beta.tiff;
• The external Alpha Plane accepts colored pixels;
• The external Beta Plane only accepts Black pixels, White pixels and Gray pixels.
The effect of external Alpha and Beta Planes can be expressed as follows:
External and Internal Alpha and Beta Planes can be enabled simultaneously.
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Projected image = Alpha Plane * Source image + Beta Plane
R5909056 MCM-400 HFR 11/05/2016