In article , Tony Cooper
wrote:

Last night I attempted to ask the Competition Chair the questions that
have been posed here. She was extremely busy with other things, and
referred me to Jim. It turns out Jim is the hands-on guy who
coordinates things and operates the projector.

ppi - I asked him if images would display better at a higher ppi and
why 72 was specified.

He said that a higher ppi would not result in a better image on the
screen, and that it really wouldn't make a difference to the viewer if
someone sent in images using a higher number. However, he said, if he
didn't specify some number, people would ask what number to use for
their images. Since images are due by midnight on the Monday prior to
Competition night, he'd get a flood of emails Monday evening asking
what number to use.

that's the lamest excuse ever.

So, it's not a silly inclusion in the rules. It's there for a reason,
and the reason is to make his job easier and provide a guide for
people who want a guide.

that's a really dumb reason. he tells people to use a meaningless tag
because he doesn't want email???

instead of saying '72 dpi', he should say 'ignore the ppi tag, it
doesn't matter what it is. whatever it's set to by your software is
fine'.

the end result is the same but people might learn something.

Color management - We use a Canon projector, and it is color managed
about four times a year. A photo is provided to show how far the
projector is from the screen.

by whom and how is it done?

The individual judges may or may not have color managed monitors.

then they shouldn't be complaining about colour differences.

Since the judges are different each month, and this is a volunteer
effort, the club can't demand what each judge does. He can't require
that the monitor be color managed or that sRGB is used. Since they
are all pros or very experienced amateurs, he has to assume that most
do color manage their monitors.

fair assumption, but you said they frequently comment on the colour
being different. if they're not profiled, then that's why.