I tried your steps with an image now, and I think it�s faster and easier if,
instead of all of this:
1- Load the Luminosity channel as a selection,
2- Save this selection as an alpha channel,
3- Increase contrast (levels ou curves),
4- Load this channel as selection,
5- Apply Unsharp mask as you wish.
Regards,
Rodolpho Pajuaba
www.pajuaba.com.br


> Dear Richard
>
>
> 1/ Duplicate one of the colour channels. Choose which gives best
> results. ie. which colour has the smooth areas darkest or lightest.
> Typically for blue sky its the red. Select it.
>
> Of course you can store actions to do this.
>
> Bob
>

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