Sizing an Image
When clicking image size for the 1st time this windows will appear.
Change this field to 72 ONLY
Change this field to 1920 or the maximum width required for the competition, ie 1440 or 1024 etc.
As can seen here the original source profile is set to ProPhoto. This is incorrect.
Change the Destination profile to sRGB IEC61966-2.1 and click OK
It has been pointed out that none of the above is necessary with modern projectors.
The reason we do this is to reduce file sizes and large emails being transferred or "bounced" when SMTP file sizes are too large.