Comments

BillyBoy wrote on 4/12/2003, 5:16 PM
Yes and no. I guess I should have said maybe. Vegas doesn't support vectors, so at present you can't select a object that has an irregular shape, such as a shirt. You can use the cookie cutter which will mask common shapes like a square, diamond, oval, circle. With some trial and error you may be able to get close using the new Color Corrector Secondary filter which can mask out by hue. See my latest tutorial for changing colors. Boris Red can do what you want and will be a plug-in for Vegas soon. One word EXPENSIVE. Actaully this plug-in costs a good deal more than Vegas itself. I hope they have a rock bottom introductory price offering.

http://www.wideopenwest.com/%7Ewvg/tutorial-menu.htm

See number #12
Grazie wrote on 4/13/2003, 1:40 AM
DJ - BB is correct - But, there's always a but, it depends how "picky" you are. Here is a link from a year ago, that could give you what you want:

http://www.sonicfoundry.com/forums/ShowMessage.asp?MessageID=95197&Page=0

It really depends on how "good" and solid the "red" is in the T-shirt.

Have a go and get back with what you think.

Grazie
Joni wrote on 4/13/2003, 8:17 AM
Thanks BillyBoy and Grazie for your help. I have tried the technic in the link given by Grazie and it worked with a still image. I still have to try it with an avi file.

Marquat,

I have tried the technic and, I admit, it is not very well explained...or detailed.
I will try to help you here:
1- Create 2 video tracks with the same material (clips)
2- On the 1st track (the one on top) use the chroma keyer to mask the colour you want to appear over the black and white. For this, select the colour you want to keep with the colour picker and adjust with LOW THRESHOLD AND HIGH THRESHOLD till it maks what you want. Then insert the black and whit effect to the same (1st) track and get your blend amount to 1.000.
The second track is the track that is going to give you the colour in the masked region that you have done in track 1. In other words, the track 2 is only visible in the masked area or track 1, the rest of it is invisible "under" track 1.
got it? (sorry about my english...its not my first language)

djoni
Joni wrote on 4/13/2003, 9:09 AM
Marquat,

I wonder if it helps to use a weird colour for the tshirt...like a "futuristic exotic" purple or something...
BillyBoy wrote on 4/13/2003, 10:09 AM
The problem with each method is unless you have a single hue and very little, better, no shading, there will be bleeding. Worse if the shirt is made of a color that also appears elsewhere that area too is effected. For example red is going to be part of flesh tones, so while you may be able to mask the shirt, you also will impact on anyone's skin and everything else that has red in it. A trade off. So much for masks built on hue or luminance. Even with the Color Corrector Secondary rarely will a single mask be effective if you trying to remove a color as opposed to changing a color. Multiple filters offer a better hope if you have lots of time to mess around.

The cookie cutter masks based on shape so anything under the mask is blocked. Of course that isn't of much use for irregular shapes.

Boris Red and others filters like it allow you to isolate an object by making a mask for its unique shape. Their demo shows how to alter a sailboat. If the object is static, you can try to do the same thing with Photoshop. For a still image its easy (see my bird mask tutorial on Kelly's site) but for a video where the object moves around and due to camera angle changes, grows is shape and prospective, the effect is going to look like sh.. unless you make a new mask every few frames, which of course would be a huge project and not very practical.