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effect of projector's beam of light))

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  #1  
Old 03-24-2009, 01:58 PM
HelloPiccadilly HelloPiccadilly is offline
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effect of projector's beam of light))

Hello everyone!
I really have problems with some kind of manipulation..(to create effect from nothing)

Here is smtng what I mean, but really just to show the concept:
http://www.freeimagehosting.net/uploads/82957bd2e3.jpg

here is image to play with:
http://www.freeimagehosting.net/uploads/a252dae697.jpg

Actually, there is no such effect in reality, but I can see that in my imagination very clear and real )

any help would be awesome!
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Old 03-24-2009, 02:24 PM
frate frate is offline
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Re: effect of projector's beam of light))

You're looking for the Tyndall effect look. Like sunbeams. It can be done. I may even take a try at it (given time later).

http://en.wikipedia.org/wiki/Tyndall_effect
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Old 03-24-2009, 03:06 PM
HelloPiccadilly HelloPiccadilly is offline
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Re: effect of projector's beam of light))

It would be nice of you!!
Thx for link, very usefull!
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Old 03-25-2009, 11:29 AM
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LonK LonK is offline
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Re: effect of projector's beam of light))

Is this the effect you are looking for?
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File Type: jpg TyndallEffect.jpg (95.9 KB, 85 views)
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Old 03-25-2009, 02:23 PM
HelloPiccadilly HelloPiccadilly is offline
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Re: effect of projector's beam of light))

Actually, yeah...It's very convincing! Maybe a little bit to reduce brightness, but I can manage that by my self...
I've just come from cinema, and I saw there almost the same effect ))

So, what is your workflow?! I would be very much obliged to you if you can give me *psd file and a little description of ur steps..
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Old 03-25-2009, 04:12 PM
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LonK LonK is offline
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Re: effect of projector's beam of light))

This was quite simple, HelloPiccadilly. I did it very quickly just as a method proof.

To make the projection beam, I brought the image into Xara Xtreme (my preferred vector editor) -> made a much smaller duplicate and moved it over the projector lens area -> reduced both to about 2% opacity in a "screen" like transparency mode over black -> used a 100 step Blend from the larger to the smaller image. Essentially, this makes 100 copies of the bright parts of the large image gradually reducing the size and position toward the small image -- similar to a "tweening" effect. With so many copies, the blend is quite smooth. The result creates the light beam that looks something like a motion zoom with only the luminosity values. This is important as only the bright areas of the beam will bounce off airborn particles creating that ghostly mist.

I took that result into PS, aligned on top of original in Lighten mode -> erased stray light areas outside the beam. Sorry, I didn't keep a .psd file. Perhaps someone else will come up with a method done completely in PS.
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Old 03-26-2009, 08:51 AM
HelloPiccadilly HelloPiccadilly is offline
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Re: effect of projector's beam of light))

Unfortunetely, I didn't get that..(
My first problem was: "reduced both to about 2% opacity in a "screen" like transparency mode over black". I pressed F6 (transparency tool), made 2% of each image..after that what should I do?
It's 1st time when I work in this program)
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Old 03-26-2009, 09:54 AM
HelloPiccadilly HelloPiccadilly is offline
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Re: effect of projector's beam of light))

after some tries I didnt get no one variant which is ok ((

LonK, I really need ur help )
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Old 03-26-2009, 11:36 AM
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Re: effect of projector's beam of light))

Xara uses different terminology than PS so let me try again.

PS uses "opacity": Xara uses "transparency". So actually, you'd be setting the transparency to 98% (give or take). You can experiment with this and/or adjust the blend "profile" after doing the blend. For example you might want to set the smaller image brighter so the beam fades toward the "projected image".

The PS blend mode "screen" is similar to Xara's "bleach" transparency mode. Since you are then working primarily with luminosity values, I said "on black", meaning work on a black background.

Next select the Blend Tool and drag from the larger image to the smaller. Reset the steps to about 100 (again you can experiment to get desired smoothness).

Hope that helps...
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Old 03-26-2009, 02:29 PM
HelloPiccadilly HelloPiccadilly is offline
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Re: effect of projector's beam of light))

Great! I've done that! Thank u very much!!
Why did u use Xara? I'm sure this is possible to do in PS ))

Last edited by HelloPiccadilly; 03-26-2009 at 02:45 PM.
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