How to change the resolution of the image?

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how change resolution of image , how set "pixel/inch" in document size. how enable check box of "scale styles", "constrain proportion" , "resample image" via scripting. kindly advise me.

 

thanks

resizeimage not let set 'scale styles'. if want scale styles need use scriptlistner.

 

here examples "constrain proportion" , "resample image".

 

activedocument.resizeimage( undefined,undefined,300,resamplemethod.none);// change dpi without resample activedocument.resizeimage( new unitvalue(2,'in'),undefined,72,resamplemethod.bicubicsharper);// change width - defaults constrain proportion activedocument.resizeimage( new unitvalue(5,'in'),new unitvalue(5,'in'),300,resamplemethod.bicubicsharper);// change both w , h - may or may not matain proportions


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