Since your blood is on white, this is behaving normally. Black would be 
transparent with plus, since x+0=x. Either invert like you're doing, and use 
some color correction to make the cyan blood red again, or use some keying and 
shuffling to make a mask for a red constant, or reshoot your element on black 
for it to work as a plus. What you probably really want to do is use multiply 
instead of plus anyway.

Sent from my iPhone

On Aug 7, 2013, at 6:27 PM, Randy Little <[email protected]> wrote:

> I have some still frame png's and jpg.   When we plus them they work exactly 
> inverted.   Its blood on white.  When we plus over the plate the darkest part 
> pf the blood becomes transparent.   When I invert the plate so black and Cyan 
> blood then plus it works as expected.   If only I wanted Cyan blood that 
> would be awesome.     
> 
> 
> Randy S. Little
> http://www.rslittle.com/
> http://www.imdb.com/name/nm2325729/
> 
> 
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