Chromatic aberration

Awarewolfe wrote on 9/19/2015, 1:22 PM
Greetings. I am having a major problem with "purple fringe" showing around the edges of everything white in my videos. I am shooting against a green screen in a Santa suit with a lot of white fur and also white gloves. This is not a little bit of purple fringe, we're talking about quite a lot. A whole lot. I have tried various lighting techniques, varying my distance from the green screen, etc., and have not come up with a way to get rid of it. Applying blur in the Chroma keyer helps very little. Does anyone have any ideas for me. Christmas is fast approaching!
awarewolfe (Santa Steve)

Comments

musicvid10 wrote on 9/19/2015, 4:55 PM
Sounds like you're maybe shooting a miniDV?
No help there I'm afraid.

astar wrote on 9/19/2015, 4:58 PM
That purple fringe is a lighting thing. Reduce the your exposure on your whites, and decrease the lighting contrast between the white and 2nd color. An incident light meter can help with this. If you do not have an incident meter, but you have a dslr or old film SRL, you can use the spot meter mode on the SRL and a 18% grey card to read the light falling on the costume and again on the backdrop. Get the contrast within inside of 1.5-3 stops either way.

The scopes on your camera, like waveform or Histogram can help with metering the white levels. The incident meter can will help with balancing the foreground light with the backdrop light.

Creating a low contrast, de-saturated shooting profile on the camera, some have this as "film like" or cine mode. These modes can help better compress the latitude between the 2 colors. Then in Vegas add back the saturation and contrast to suit your look.