Resolution and sizing


hello, have silly question.  i'm editing photos make calendars.  specs 1666 x1294 pixels.  if change resolution on photo 72 300 increases whole photos size, resize down specs.  should leave resolution in original photo??  hope makes sense.  use canon rebel t3.  resolution that comes off camera.

 

thanks help.  i've tried reading tutorials resolution , re-sizing here @ adobe brain not understanding it.  must age.

if specs call 300 ppi, make sure uncheck resample box when changing resolution. 

otherwise up-sampling , down-sampling image, , losing detail each change.



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