Moire help

[Wally]

I knew as soon as this guy walked in that his shirt was going to be a problem.  Can I please have some help removing the moire?

[Damien Symonds]

This Channel Mixer layer might work?

• R 0, +102, 0, -5
• G 0, +100, 0, 0
• B 0, +102, 0, +10

[Wally]

I swear I've entered the correct numbers.  Where am I going wrong?

[Damien Symonds]

Nowhere.  You've done it perfectly.

[Wally]

I'm  a little confused.  On my screen when viewing in PS the moire hasn't changed at all after the channel mixer layer has been applied.  

[Damien Symonds]

That's because you're not looking at it at 100%.

Remember, Moire must ONLY be judged at 100%.  All other views give you a false indication.

https://www.damiensymonds.net/moire/

[Wally]

Got it.  Thank you.

[Wally]

Just revisiting this one.  I got some really good profile shots of this guy.  Even with the Moire removed it still shows up severely at different zoom levels.  I understand why this happens.  Is there a way to reduce how much moire occurs when not zoomed to 100%?  I specifically said no thin striped or checked shirts before the shoot and I have had no luck organising a re-shoot as the guy is so busy.  Hence the reason I want to use them for advertising, he is very well known in the area and would be great advertising material.

[Damien Symonds]

49 minutes ago, Wally said:

Is there a way to reduce how much moire occurs when not zoomed to 100%?

The only way is by resizing carefully to exactly the right size and resolution for each form of output (print, web, whatever).

If you don't have that control, and it seems likely that you don't, then your only other solution is to blur the hell out of the shirt to get rid of the texture altogether.  Not a satisfactory method, I'm sure you'll agree.