how can u get it right on cam?
Lighting, composition, make-up(if applicable), exposure and remove distracting elements that doesn't add up to the overall image... obviously...
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bisan kapila pa nimo e click imo cam and you got it right, if your client wants you to edit the image then kinahanglan mo click gyud ka sa mouse... e.g. ang bugas sa imong model(if model2x or portrait imong shootan) nga bisan unsaon pag tabon sa make-up, makita gyud sa output...
unsa imo buhaton? if "purist" ka, pasagdan nalang? kay get it right on cam man, walay edit2x... or imo client wants a b/w and version of the colored image (nya no choice naka kay colored pag shot nimo), pasagdan lang kay "purist" man ka, ingnon lang nimo imong client
"no to editing man ko, sorry, ngita nalang og lain", get it right man sa cam...
my point is there are some instances nga kinahanglan gyud ka photo editing softwares para to satisfy yourself or your clients,
if you don't know how or want to edit your images then hire someone who can do it for you para stay "purist" ka, kay dili man ikaw ang ga edit... 
as i said sa previous nako nga reply... "Purist" are BS (Bu**S**t dili
BoyScout)
if someone can mention a sikat photographer nga in any way wala gi manipulate/gi edit ilang images... mag "purist" nasad ko... bisan kato mga old masters...

give the link hap...