Digital Advice

Advice about Projected Digital

This page has a range of advice about projected digital competitions. Please use the ‘Contact Us’ form if you would like advice to be developed on any other topic.

Getting Started

Usage

InterClub Competitions

Resizing images:

Projection Size

  • Most Clubs use either XGA or SXGA+ size projectors. Currently the split may be about 30:70 for each size.
  • CACC does not recommend any specific choice of projection size for Clubs. Both XGA (1024×768) and SXGA+ (1400×1050) will remain suitable for the indefinite future. UXGA (1600×1200) is a recently introduced option.
  • CACC uses SXGA+ size for its own events, but any size is permitted when Clubs host CACC matches eg, Rosebowl. The only requirement is that a Host Club must inform Guest Clubs of the projection size to be used.
  • In practice, it is not possible to distinguish a significant quality difference between the various sizes, unless they are carefully compared side by side or the screen display is particularly large. A poorly set up SXGA+ system can easily give a lower quality image than a properly set up XGA system.

Test Images

CACC Projection Test Frames and Sample Image Set: at sizes XGA (zip 6MB), and SXGA+ (zip 10MB)

Recommended Maintenance

  • Many club projectors are now several years old. Perhaps the original calibration has drifted slightly, or a change is permanent and not correctable.
  • Clubs may not have re-calibrated their projectors in the last year. We recommend that clubs calibrate every year from now on.
  • Clubs may have changed their laptop and not re-calibrated. Calibration is always of the entire system.
  • Some “difficult” images will “challenge” consistency of colour balance, contrast and brightness. Calibrated projectors may still give minor variations which will not be correctable.

To help solve as much as possible about projection accuracy, the CACC suggests the following.

  • Clubs should calibrate projectors at the beginning of the Club year eg, in September.
  • Members aware of any issues about image projection at their own Club should resolve the matter with their Club’s Projectionist or Committee.
  • The ‘Sample Image Set’ of test images from the CACC web site should be projected before every Club and InterClub competition, to accustom the judge and audience to the projection.

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