Well first of all i went with a fellow photographer... maybe not very experienced since he blamed the camera (he is a nikonian which is anti canon).. which he was kind enough to offer me the chance to shoot the wedding as a rookie

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Being "Nikonian" is not being anti Canon... being anti-Canon is just being a snob... lol. The problem is not camera brand related, its just a little lack of knowledge.
Second of all i used the AWB since no other option gave me a better result.
Well, it almost gave you a better result... lol You get brownie points for trying.
About the temperature (the temperature modifier in Lightroom, similar with the slider in raw of the photoshop) thing, well the blueish tint it's not all over the image so it can't be corrected with Temperature because when i have good results with the dress the rest are very warm, maybe too warm. The only way is with masking which is quite time consuming.
Actually, it is across the whole frame, its not clearly visible because other objects are not white, at least it is so in the picture you provided.
It would not have been an issue had you been shooting in RAW. When using the ACR settings, you have 2 sliders, the temp and hue (is it that way in LR? It is in PS CS3).
In a RAW image, that HUE slider would have done the job that you needed... mainly affect the dress hue to white and though it would have warmed the picture some, it would have been very little... in fact, in my own attempts to fix my errors (yeah, been here and done that too... lol), it added very little warmth to the picture. Overusing just the temp slider made a more negative impact to the picture warmth in my experience. Adding the use of the hue slider solved that perfectly (in my case I required both sliders for best results).
Ohh, and i shot JPG, because i wanted to have more room to play with the settings. I took like 750 photos

)). I know very well the advantages of the RAW images, but for the moment i can't use it as long as i don't have the necesary space (some backup cards).
They're falling EVERY day. When I got my camera, a single 8GB SanDisk Extreme IV CF card was $475 each locally. Today that same card I can get about anywhere for under $130.
But, besides that... if you want to play, you'll have to pay. Please, I don't want to sound harsh, but in any other role except where there is the potential to inconvenience a paying client, this is not what I would call a valid excuse. Not when you are out there doing weddings in the position as a second professional photographer.
In a pinch, you could have had someone with a laptop and card reader available to you and have them transfer the RAWs for you as you zoomed around, using only 2 cards. Difficult? Definitely, but possible, and it would have cost you less time in post. Even if you missed a few shots, the results that you did have, would have been better.
hey, you can't gave photos with blue dress when it was white

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lol... no, it tends to piss off the bride for some unknown reason. I don't know, it has to be a woman thing. Maybe someone nice lady here can explain that one to us dumb men. :lmao: