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Little knoll
Matting single item
on Oct 2, 2006 at 11:08:48 am

I have a scene where a rose is placed on a pillow. The entire scene has several filters over it that have changed the color. We want the rose to stay the same color, both bud and stem.

I have been playing around in Motion to matte the individual frames instead of trying to do that in Photoshop, but I am having a difficult time.

Does anyone have any suggestions as to how I can pull out just the rose and overlay this matted image on the color enhanced clip?

I greatly appreciate your assistance.

Kimberly



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Noah Kadner
Re: Matting single item
on Oct 2, 2006 at 3:50:20 pm

Try the color key filter.

Noah


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specialcase
Re: Matting single item
on Oct 2, 2006 at 7:38:41 pm

Heya,

Basically, there are two approaches: (1) frame-by-frame roto, or (2) using multiple passes of keyers to build a matte.

Unless your rose was shot against a bluescreen, the most accurate method would be to hand-animate a mask (roto). No complicated tricks: just start keyframing. This method is the most time-intensive, but it's also the reason why every visual effects studio has at least one roomful of people doing it all day. Still, you might be able to animate a nice mask in the time it takes to read the rest of this post ;)

Your other option is to try a combination of different keying passes, assembling them into a finished matte. The basic workflow is to make a copy of the shot and then process the copy so that it gives you a part of your finished matte. The number of steps/passes varies hugely, depending on the properties of the shot. This workflow best lends itself to a flowgraph-based compositor like Shake, but you can do it in just about any program.

For example, the rose may stand out as a dark object against a white pillow, so you could try pulling a luminance key (filter) to get started. Before applying the key, you might want to apply some contrast to further darken the rose and whiten the pillow, using filters like Contrast or Threshold. If the stem is a clear green, you could do a color key to isolate only the green in the shot, or maybe the red of the rose petals. Keep in mind, though, that there will probably be other elements in the shot that contain those same colors (like the red in human skin). So, you may want to do loose masks around the rose copies (removing other elements like people) before you try to key them. As you can see, this can go on and on. Sometimes this will work in a single step, sometimes it requires many and lots of noodling. But once you have all your parts, comp them together in a layer and use that layer as the source for an Image Mask on your original rose shot.

Good luck on your project!


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Little knoll
Re: Matting single item
on Oct 5, 2006 at 1:54:29 pm

Thank you for your assistance. I was able to pull the rose our of the background by using several technics.

I first matted the rose bud. I did the Pleasantville effect and then I was able to Chroma Key out the black and white. Luckily I did not lose anything on the rose.

I had to repeat the process for the green of the stem.

It took me about two hours and looks quite good.

Blessings,
Kimberly


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