so, here's my situation,
did an event last night which took place in 3 different rooms, have tweaked exposures and contrast etc.. for 400 odd photos, I've exported them all as colour and good to go!
now what I'd really love to do is supply a Black and White version of all the images, I know I can change the first one and sync but then exposure etc... will be matched to that image which won't work for later on shots,
Is there a quicker way than going through every image and pressing v? also I would like to quickly undo so that my catalogue is back to colour once they have been exported?