• grandMA2 User Manual
  • grandMA2 Quick Start Guide
  • MA 3D
  • MA VPU
    • Introduction
      • Help from MA technical support
      • System requirements
    • For your Safety
    • Functions and Features
      • Transition from grandMA video to MA VPU
      • Teaser Mode
      • Comparison VPU plus / VPU basic / VPU light
    • Main Features
      • Installation and Maintenance
        • Startup
        • Software update
          • Service Packs
        • Update of Fixture Types
        • Backup
          • Handling backups with the VPU
          • Start Acronis on VPUs with serial Numbers up to # 86 on
          • Start Acronis on VPUs with serial Numbers from # 87
          • Restoring an image with Acronis
          • Storing an image with Acronis
          • Backup the VPU content after shipment
        • Access VPU via Network
        • Version of grandMA desk or grandMA onPC (off-line)
        • IP Addresses
          • IP Address of the PC
          • Art-Net IP Address
        • EDID Manager
        • CITP / MSEX Protocol
    • Communication with the grandMA Desk Series
      • Connection with the grandMA desk
      • Connection with the grandMA onPC (off-line) software
      • Connection States
    • Data Management
      • Master slave
      • Principle function diagram
      • Layer Properties
      • Layer Reference
      • Virtual Outputs
        • Virtual Output: Configuration of a TripleHead2Go Digital Port
      • Predefined Constellation
    • Several MA VPU applications in one grandMA show
    • Quickstart with grandMA2
    • Program surface
      • Internal Touch-Screen VPU plus
      • Internal Screen VPU light
      • Menu Bar
        • File...
        • View...
        • Render...
        • Help...
      • Toolbar
      • Status Bar
      • Preview
      • Multi Preview
      • Content Editor
        • Content: Image Pool (I-Pool)
        • Content: Text Ticker
        • Content: Eff1 Type...Eff4 Type
        • Content: 3D Objects
        • Content: Mask
      • Warper
        • Warper Fullscreen View
        • Warper Basic Operation
        • Warping
      • File Browser
    • Features Attributes and Functions
    • Order of Effect Execution
    • Softedging
    • Keystoning
    • Pixel Mapper
      • VPU - Pixel Mapper Graphical View
        • Pixel Mapper Toolbar
        • Pixel Mapper Editor
      • VPU - Pixel Mapper Grid View
      • Console - VPU Pixel Mapper View
    • Creation of customized 3D Objects
    • Content Specifications
      • Rovi Total CodeStudio for converting your content into MPEG2
      • Hap Content Converter
    • Warnings
    • Keyboard Shortcuts
    • Supplement MA Lighting
      • Intended use
      • Data
      • Symbols and warning labels
      • LIMITATIONS
      • Transport
      • General Safety Instructions
      • IMPORTANT SAFETY INSTRUCTIONS
      • Electric shock warning on the rear of the grandMA
      • Safety and Environment
      • Quickstart Connect VPU plus
      • Quickstart Connect VPU light
      • Switching the apparatus On/Off
      • Maintenance
      • Conformity
  • Release Notes
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Version 3.3

Keystoning

If a projector is parallel to the screen, the image is a right-angled plane.

If the projector is shifted horizontally or vertically the right-angled projection gets trapezoid.

This effect is called keystoning.

Original image Distorted projection
  (tilt upward)

 

This effect can be minimized by using the keystone correction.

Keystone correction recalculates the image that it is shown right-angled independent of the position of the projector. Therefore the pixels must be compressed and the image is made smaller.

Important:
The keystone correction always causes a compression of the projected image. This causes a loss of quality of your projection.

This correction is done in the camera fixture:

For every edge of the image 1…4 there exists two attributes (Keystone 1A-1B…Keystone 4A-4B). With these attributes the edges can be moved in horizontal and vertical direction: Attributes keystone: X and Y are for the distribution of the picture content in X and Y direction.
   
The resulting output image for this distorted layer looks like the image beside.
   
Hint:
On the desk you can use the special dialog to edit the values for the keystone values.

Selecting the keystone feature of a camera fixture will enable the special dialog button:

All values can be entered in a graphical way with a preview in this special dialog:

Special dialog keystone
Special Dialog 'Keystone'

Select different version