Apple Script: How to deactivate single channels of a layer?

Hi there,
can someone probably tell me how to deactivate specific channels of a layer?
Example: Photoshop file with two layers, say CMYK. I want to deactivate CMY of the first layer, so that only K can be seen.
Unfortunately I didn’t find any information in the PS scripting guide nor in the scripting reference.
Thanks for any help on this.
andy

Paul, is correct you can't even do this in the app through the GUI. You would either need to duplicate your top layer loop through the channels that you don't want selecting all and clearing then going back to the composite or you could add an adjustment layer above the top grouped and use this by toggling its visibility (this is the way I would go). Paul 'AppleScript'? you've made me smile this morning what's come over you…
Added some code from scriptlistener…
tell application "Adobe Photoshop CS2"
activate
set Doc_Ref to the current document
tell Doc_Ref
if mode = CMYK then
set current layer to layer 1
-- delay 2
do javascript "Just_Black(); function Just_Black() {function cTID(s) { return app.charIDToTypeID(s); }; function sTID(s) { return app.stringIDToTypeID(s); }; var desc01 = new ActionDescriptor(); var ref4 = new ActionReference(); ref4.putClass( cTID('AdjL') ); desc01.putReference( cTID('null'), ref4 ); var desc02 = new ActionDescriptor(); desc02.putBoolean( cTID('Grup'), true ); var desc03 = new ActionDescriptor(); var list5 = new ActionList(); var desc04 = new ActionDescriptor(); var ref5 = new ActionReference(); ref5.putEnumerated( cTID('Chnl'), cTID('Chnl'), cTID('Cyn ') ); desc04.putReference( cTID('Chnl'), ref5 ); var list6 = new ActionList(); var desc05 = new ActionDescriptor(); desc05.putDouble( cTID('Hrzn'), 0.000000 ); desc05.putDouble( cTID('Vrtc'), 255.000000 ); list6.putObject( cTID('Pnt '), desc05 ); var desc06 = new ActionDescriptor(); desc06.putDouble( cTID('Hrzn'), 255.000000 ); desc06.putDouble( cTID('Vrtc'), 255.000000 ); list6.putObject( cTID('Pnt '), desc06 ); desc04.putList( cTID('Crv '), list6 ); list5.putObject( cTID('CrvA'), desc04 ); var desc07 = new ActionDescriptor(); var ref6 = new ActionReference(); ref6.putEnumerated( cTID('Chnl'), cTID('Chnl'), cTID('Mgnt') ); desc07.putReference( cTID('Chnl'), ref6 ); var list7 = new ActionList(); var desc08 = new ActionDescriptor(); desc08.putDouble( cTID('Hrzn'), 0.000000 ); desc08.putDouble( cTID('Vrtc'), 255.000000 ); list7.putObject( cTID('Pnt '), desc08 ); var desc09 = new ActionDescriptor(); desc09.putDouble( cTID('Hrzn'), 255.000000 ); desc09.putDouble( cTID('Vrtc'), 255.000000 ); list7.putObject( cTID('Pnt '), desc09 ); desc07.putList( cTID('Crv '), list7 ); list5.putObject( cTID('CrvA'), desc07 ); var desc10 = new ActionDescriptor(); var ref7 = new ActionReference(); ref7.putEnumerated( cTID('Chnl'), cTID('Chnl'), cTID('Yllw') ); desc10.putReference( cTID('Chnl'), ref7 ); var list8 = new ActionList(); var desc11 = new ActionDescriptor(); desc11.putDouble( cTID('Hrzn'), 0.000000 ); desc11.putDouble( cTID('Vrtc'), 255.000000 ); list8.putObject( cTID('Pnt '), desc11 ); var desc12 = new ActionDescriptor();desc12.putDouble( cTID('Hrzn'), 255.000000 ); desc12.putDouble( cTID('Vrtc'), 255.000000 ); list8.putObject( cTID('Pnt '), desc12 ); desc10.putList( cTID('Crv '), list8 ); list5.putObject( cTID('CrvA'), desc10 ); desc03.putList( cTID('Adjs'), list5 ); desc02.putObject( cTID('Type'), cTID('Crvs'), desc03 ); desc01.putObject( cTID('Usng'), cTID('AdjL'), desc02 ); executeAction( cTID('Mk '), desc01, DialogModes.NO );}" show debugger on runtime error
end if
end tell
end tell

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M.Sc. Holger Wons | measX GmbH&Co. KG, Mönchengladbach, Germany | DASYLab, DIAdem, LabView --- Support, Projects, Training | Platinum National Instrument Alliance Partner | www.measx.com

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