adding grain in post- rendering issues?

[nycineaste]

read something somewhere that adding grain in post (phony grain- im aware real film grain is different), can be problematic in that in asking the...er rendering codec(? is that the term?) to render the tons of little grain/noise bits it has lots of data to contend with, so it introduces video artifacts and effects image quality negatively on the whole. granted ill be making my first feature on the dv100a, standard def, and will likely be adding some blur too, so it aint gonna look movie theatre quality anyway, but. does anyone know anything about this or have any thoughts? also-- is the standard grain effect in vegas or any other nle any different from the noise effect that most nles have? I wouldn't be surprised to hear that they are actually the same thing or just slight variants of the same thing. sorry for the multiple question...im just collecting lil nuggets of info right now on post-graining stuff, so any thoughts on the whole subject would be appreciated.. not like ive made a movie worth putting on dvd or anything yet..

 

[Patryk_Rebisz]

Why still shoot SD other than to emulate old look?

Yes, it will be nightmare to encode as most encoders are trying to reject the minute details for ease of encoding. Depending on bit rate of the encoding the grain might be though to be necessary-to-encode details of the image thus making it so much harder to create acceptable image because your WHOLE image is filled with necessary to preserve details.