Originally Posted by Pixel_Happy
I'm trying to composite a dancer into a dark street background (see attached) and I'm having trouble with her dress. The bottom of the dress is sheer and through it I am seeing the background of the "donor" shot. To get rid of it I've tried the "Blend If" option but it doesn't seem to work. Does anyone have a good suggestion?
That looks pretty rough. A few tips:
Break it into small hunks to work on. You won't find a solution that does the whole dress at once.
Seriously consider just painting in new sections of the dress. This sounds harder than it really is. I can't see any real texture detail, just translucency / noise. You can use the actual shot as a guide for where to paint and how much to lay down opacity wise. I know... it sounds crazy, but painting really is the best kept secret with compositing tough materials like translucent fabrics and hair. You don't have to be a master, you do after all have the best reference you need sitting right in front of you.
Blend if really works its wonders when you use the channel's instead of just the default RGB - you can get really crazy accurate when you have multiple channels working. it's one of my favorite tools!
Do you have any other shots of here jumping? You could steal a better dress from one of those and use it's parts to graft into the shot.