Hi
I'm no scripter but can you perhaps add an action to set the "proof" colourspace as you wish?
I would also think you would need to set the output device colourspace now you have invoked "photoshop manages color".
The proof colours mode / profile selected should not change printed appearance unless the print dialog is now set to 'hard printing'.
Rob Day or Stephen_A_Marsh are your guys for this type of script, I think.
I hope this helps
neil barstow, colourmanagement.net :: adobe forum volunteer
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