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 Author Thread: Chromakeying 101
Ponderosa is not online. Last active: 9/11/2006 11:54:22 AM Ponderosa
Joined: 16 Dec 2004
Total Posts: 22
 
Chromakeying 101
Posted: 24 Jan 2005 04:14 PM

Hi-

Would somone mind giving a brief overview of how to do a chromakey effect in WMM? Like a basic overview of what it is, how you do it and why you would use it would be great.

Do I have to make my own blue (or red or green) screen?

Many thanks!

-Ponderosa
jeb314 is not online. Last active: 2/5/2007 11:36:48 PM jeb314
Joined: 17 Dec 2004
Total Posts: 251
 
Re: Chromakeying 101
Posted: 24 Jan 2005 08:03 PM
Chroma keying in movie maker is done as a transition: the first clip is your background, the second is your foreground from which the blue will be removed. There are two main types: a non red key, which will remove all exact blue and grens, and an RGB Chroma key, which will remove whatever color you tell it to. the xml codes for these transitions are the following:
<TransitionsAndEffects
Version="1.0" >
<Transitions>
<TransitionDLL guid="{C5B19592-145E-11D3-9F04-006008039E37}" >
<Transition name="Non-red Key Transition" iconid="11" comment="non-red Key Transition">
<Param name="KeyType" value="1"/>
<Param name="Similarity" value="75"/>
</Transition>
<Transition name="Chroma Blue" iconid="88">
<Param name="KeyType" value="0" />
<Param name="RGB" value="0x0000ff" />
</Transition>
<Transition name="Chroma Green" iconid="88">
<Param name="KeyType" value="0" />
<Param name="RGB" value="0x00ff00" />
</Transition>
<Transition name="Chroma Black" iconid="88">
<Param name="KeyType" value="0" />
<Param name="RGB" value="0x000000" />
</Transition>
<Transition name="Chroma White" iconid="88">
<Param name="KeyType" value="0" />
<Param name="RGB" value="0xffffff" />
</Transition>
</TransitionDLL>
</Transitions>
</TransitionsAndEffects>


You can put any color in the RGB value. The movie maker chroma key requires that your background be the exact color of either blue, green, or your RGB code; it must be evenly lit and all one color. You then take your two clips, drag the desired chroma transition between them, and stretch the transition to the length of both clips.
Ponderosa is not online. Last active: 9/11/2006 11:54:22 AM Ponderosa
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Re: Chromakeying 101
Posted: 25 Jan 2005 12:36 PM

jeb314-

great! this was certainly helpful!

thanks very much,

Ponderosa
pegson is not online. Last active: 8/7/2005 3:50:42 AM pegson
www.wmmarchive.tk
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Re: Chromakeying 101
Posted: 02 Feb 2005 06:00 AM
thanx for this

Come Visit www.wmmarchive.tk
Come join the wmmarchive
Forums


If you have a effect/transition you want added to wmmarchive email it to wmmarchive@hotmail.
Modify_inc is not online. Last active: 10/11/2011 10:20:16 AM Modify_inc
Joined: 28 Aug 2005
Total Posts: 32
 
Re: Chromakeying 101
Posted: 30 Aug 2005 12:07 AM
I'm doing something wrong, I can't get it to work. I have a picture of fire on a black background. I put the picture over my other picture (the background picture) using the chroma black transition. Yet when I play the video, it only shows the picture with the fire and black background.

I can use the Comp A add B transistion and it works fine. I must be confused using the chroma transitions. I tried all of them on the picture, and none of them work right for me, they all have the same effect.

What am I doing or not understanding?

Mike
Persian Poet Gal is not online. Last active: 12/28/2006 4:05:18 PM Persian Poet Gal
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Re: Chromakeying 101
Posted: 30 Aug 2005 12:48 AM
Modify inc: Usually the fixed color ones only chroma key that color value only (you can try and modify the value yourself). For example the color blue value is 2 and color value of your film is 1, this results in no effect what so ever due to the values canceling out. In this case most recommend to use the Non-Red Chroma Key (the code is already posted above ;). This determines any Non-Red value as something to chroma out. It's quality is very crude but doesn't hurt to try once in awhile. Once thing I definetely recommend as well, since this crude code can only do so much make sure to film your blue screen in a very well lit space natural sunlight would be best or brighten it movie maker. I notice when I do this it works better with the Non-Red Chroma I'm not sure about others. You can see a chroma code in effect at the link in my signature under Editing>the Persian Page, scroll to the "So What Can XML Do Clip" (keep your eyes open for the explosion in the sky at the near beginning :).

Need help with xml?
~Come visit The Persian Page~

Currently offline due to broadening my horizons at highschool :)!
dlk is not online. Last active: 7/2/2011 1:14:29 PM dlk
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Re: Chromakeying 101
Posted: 30 Aug 2005 08:13 AM
non-red won't work with black, in fact it won't work with green
So it's really a misnomer...it's the any-shade-of-blue key
Since you are working with a black background...here are my tips.

Make sure the "fire on black" clip is the second clip on the timeline
So it looks like this:
new background/chroma black transition/fire on black

If it still doesn't show...use the "brightness decrease" effect on the fire clip
that will drop all the "almost black" pixels to 0,0,0

When all is said and done though, you may already have gotten
the best results by using the comp A and B

dlk

Modify_inc is not online. Last active: 10/11/2011 10:20:16 AM Modify_inc
Joined: 28 Aug 2005
Total Posts: 32
 
Re: Chromakeying 101
Posted: 30 Aug 2005 09:57 AM
Well, that made a difference by using the decrease brightness. Each time I added, it tooka a bit of the black out, and showed the fire. I used up to six times, and it still had some black in it, and I could barely see the fire. It seems the comp A and B works best for now.

Does the background picture need NOT to have black in it to make it work better or is it the opposite? Either way, I tried a picture without black and it was the same thing. I also tried a picture with alot of black in it and same thing. So why did I have to decrease the brightness of the fire picture? Was that the wrong color or shade of black in the picture?

Thanks for your suggestions.

Mike
dlk is not online. Last active: 7/2/2011 1:14:29 PM dlk
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Re: Chromakeying 101
Posted: 30 Aug 2005 10:22 AM
As you described it, you have a "picture of fire on a black background"
The problem is that even though the background looks black to you
and probably me...it's not pure black. Since MM2 is looking at the
RGB(Red Green Blue) value of this image, and your chroma-black
transition is keying off the RGB value of 0,0,0, that is the only value
that will become tranparent. Back to your image, as I said...it looks
black, but the RGB values may be 1,1,1, or 1,0,1 or 0,1,1 or 2,2,2
You can see where I am going with this...there are a lot of combinations
that look black, but the black chroma key is only looking for 0,0,0
And the background may be a variation....some 0,0,1 and some 0,1,0
You can load your picture into MS-Paint and use the eyedroper to
test different pixels on the image...and see what the RGB values are.

So....since the similarity parm of the chromakey transition doesn't work,
(this would allow you to match all the colors close to what you want)
and it is not so easy to get all pixels the same...you can use a black background
and then brightness decrease to get everything to 0,0,0 or use a white
background and the brightness increase to get everything to max out
at 255,255,255. Or use a blue background and the non-red key which
does seem to support a default form of similarity.

dlk
Modify_inc is not online. Last active: 10/11/2011 10:20:16 AM Modify_inc
Joined: 28 Aug 2005
Total Posts: 32
 
Re: Chromakeying 101
Posted: 30 Aug 2005 01:27 PM
thanks for going in detail, thats helps alot. I'm learn something everytime I come into this forum, thanks to people like you.

Mike
Mudcon is not online. Last active: 3/20/2008 4:58:03 PM Mudcon
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Re: Chromakeying 101
Posted: 30 Aug 2005 03:20 PM
does any one have an example of how it is suppost to work in a vid?

Mudcon.com

Mudcon Productions
PapaJohn is not online. Last active: 2/23/2015 2:43:58 PM PapaJohn
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Re: Chromakeying 101
Posted: 30 Aug 2005 04:19 PM
The Persian's example shows it working in a video...

... my website isn't here... it's at www.papajohn.org
pcremag is not online. Last active: 12/22/2005 5:58:17 PM pcremag
freakzflickz.pcremag.com
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Total Posts: 41
 
Re: Chromakeying 101
Posted: 16 Oct 2005 05:27 PM
I'm new to MM2 adding transitions. How do you add those codes into MM2? Please help me on this one, since I have seen Detonation Films effects and would like to use them, but have been having trouble using Zwei-Stein. This sounds easier to use. Thanx for any help :)

<=Freakz Flickz Filmz=>
http://freakzflickz.pcremag.com
http://pcremag.com/
PapaJohn is not online. Last active: 2/23/2015 2:43:58 PM PapaJohn
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Re: Chromakeying 101
Posted: 16 Oct 2005 06:31 PM
the developing Editing > The Persian Page of my website is meant to teach the novice what they need to know about using the custom code... it's far enough along to use it for starters.

... my website isn't here... it's at www.papajohn.org
pcremag is not online. Last active: 12/22/2005 5:58:17 PM pcremag
freakzflickz.pcremag.com
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Re: Chromakeying 101
Posted: 17 Oct 2005 07:18 PM
I just read that quick part on Blue-Screening. Can it be done with a sky background as well as the Black background? Or is it just limited to Black background at the moment?
Great tutorial PapaJohn. I will test it on my next film :)

<=Freakz Flickz Filmz=>
http://freakzflickz.pcremag.com
http://pcremag.com/
PapaJohn is not online. Last active: 2/23/2015 2:43:58 PM PapaJohn
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Re: Chromakeying 101
Posted: 17 Oct 2005 07:38 PM
thanks... at this point, it's totally the product of the Persian Poet Gal, so I'll let her or others answer your question.

... my website isn't here... it's at www.papajohn.org
pcremag is not online. Last active: 12/22/2005 5:58:17 PM pcremag
freakzflickz.pcremag.com
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Re: Chromakeying 101
Posted: 17 Oct 2005 07:56 PM
I've tried it with the blue background, and it didn't look too good. I tried with the black and it had an amazing effect! Thanx for the tips d00d :)

<=Freakz Flickz Filmz=>
http://freakzflickz.pcremag.com
http://pcremag.com/
adambomb479 is not online. Last active: 4/28/2006 8:21:03 PM adambomb479
Joined: 05 Nov 2005
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Re: Chromakeying 101
Posted: 05 Nov 2005 10:43 AM
when i save the xml file into tho fojlder AddOnTFX it does not show up in WMM can somebody please help me.
Thanks!
Persian Poet Gal is not online. Last active: 12/28/2006 4:05:18 PM Persian Poet Gal
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Re: Chromakeying 101
Posted: 05 Nov 2005 01:16 PM
adambomb479: Here's a couple things you might want to check:

1. Did you check your Transition, Effect, and Title/Credit folders in the program?
2. Have you created the AddOnTFX folder in this location (C:\Program Files\Movie Maker\Shared).
3. When saving the xml in Notepad did you make sure to type the .xml when typing the save name (e.g. "name.xml")?
4. Do you have administrator priveleges (does the person that runs the computer allow other users to make system-wide changes)?
5. Are you using version MM1, MM2, or MM2.1 (you can check by going to the Help menu and selecting About Windows Movie Maker, right under the copyright information there is the version number)?


There are a bunch of other factors as well but for now that's the information that you need to post.

Need help with xml?
~Come visit The Persian Page~

Currently offline due to broadening my horizons at highschool :)!
adambomb479 is not online. Last active: 4/28/2006 8:21:03 PM adambomb479
Joined: 05 Nov 2005
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Re: Chromakeying 101
Posted: 05 Nov 2005 06:40 PM
Yes to all of those questions, and i'm using version 2.0 I dont know what could be going on. do you have any more ideas?
-thans!
jedistubby is not online. Last active: 11/12/2005 5:26:11 PM jedistubby
Joined: 07 Nov 2005
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Re: Chromakeying 101
Posted: 07 Nov 2005 03:05 PM
im sorry but im a total newb to chroma key transitions, where do i write that and how can i use the transition? lol
PapaJohn is not online. Last active: 2/23/2015 2:43:58 PM PapaJohn
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Re: Chromakeying 101
Posted: 07 Nov 2005 03:29 PM
start on the Editing > the Persian Page of my website...

... my website isn't here... it's at www.papajohn.org
jedistubby is not online. Last active: 11/12/2005 5:26:11 PM jedistubby
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Re: Chromakeying 101
Posted: 07 Nov 2005 04:47 PM
how do you make the background play EXACTLY the same time as the foreground ( i mean to the mili-second)
PapaJohn is not online. Last active: 2/23/2015 2:43:58 PM PapaJohn
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Re: Chromakeying 101
Posted: 07 Nov 2005 05:05 PM
as transitions ca only overlap to all frames but one, you need to add some extra leader to the beginning of the backgroun...

... my website isn't here... it's at www.papajohn.org
jedistubby is not online. Last active: 11/12/2005 5:26:11 PM jedistubby
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Re: Chromakeying 101
Posted: 07 Nov 2005 05:14 PM
so it is really quite easy, but if i wanted to make one long movie, and with lots of video clips that i need to be bluescreened, the background from one scene will go one frame into the foreground of the next


now what do i do?
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