You are viewing an archive of the old fxhome.com forums. The community has since moved to hitfilm.com.

spill suppression with Red doesn't work

Posted: Thu, 25th Jun 2009, 1:46am

Post 1 of 6

NightMan

Force: 1451 | Joined: 5th Sep 2007 | Posts: 40

CompositeLab Pro User EffectsLab Pro User FXhome Movie Maker

Gold Member

I filmed a stop motion sequence with a white background and then changed the white to red in photoshop. This is the first time I have tried red. There is no green in auto colour difference key? Its in Colour difference and chroma key and that works fine, however the spill suppression using red removes the spill but then changes everything to a heavy green. I believe because red isn't used often used, the spill correction for red hasn't been programmed properly. If the spill would have worked correctly I would have created a perfect key - I wanted to do this due to the lighting conditions while filming the stop motion.
Posted: Thu, 25th Jun 2009, 2:23am

Post 2 of 6

NightMan

Force: 1451 | Joined: 5th Sep 2007 | Posts: 40

CompositeLab Pro User EffectsLab Pro User FXhome Movie Maker

Gold Member

I meant to say there is no red in auto colour difference key!
Posted: Thu, 25th Jun 2009, 3:14am

Post 3 of 6

Terminal Velocity

Force: 2507 | Joined: 7th Apr 2008 | Posts: 1350

VisionLab User FXpreset Maker Windows User

Gold Member

I'm just curious; why didn't you just use green or blue? Maybe even purple? Is it absolutely essential that red be used?
Posted: Thu, 25th Jun 2009, 3:28am

Post 4 of 6

NightMan

Force: 1451 | Joined: 5th Sep 2007 | Posts: 40

CompositeLab Pro User EffectsLab Pro User FXhome Movie Maker

Gold Member

using any other colour other than Green, blue and red, the software doesn't offer a spill suppression. i thought I could try red as the metalic object that I was photographic was, what I thought, to be the furthest colour from red. Most likely blue may have been a better choice but as I now have discovered red spill doesn't work in the software.
Posted: Thu, 25th Jun 2009, 3:34am

Post 5 of 6

Terminal Velocity

Force: 2507 | Joined: 7th Apr 2008 | Posts: 1350

VisionLab User FXpreset Maker Windows User

Gold Member

I'm no expert with this, but I would say spill suppression for red doesn't work because it isn't as widely used. I don't know if I can help much, but I'd say just don't use red unless absolutely necessary.
Posted: Thu, 25th Jun 2009, 3:49am

Post 6 of 6

NightMan

Force: 1451 | Joined: 5th Sep 2007 | Posts: 40

CompositeLab Pro User EffectsLab Pro User FXhome Movie Maker

Gold Member

or the programmers could investigate the problem and maybe fix it. It would be good to have a choice so one can find the colour furthest from the colour of the photographed object - say either green, blue or red. painting the key colour red - on this occassion caused less bleed into the photographed object so I chose to go with red - only problem the spill supression doesn't work so the object doesn't come back to a colour fairly close to the original intended colour.