Alpha actors for Isadora

I think due to the way the Isadora programing environment has grown over the years with the addition of OpenGL acceleration the Alpha channel is not effected by the Keying actors in Isadora, instead the actors have the compositing built in. But if you are using the 3d capabilities of Isadora or multiple Layers of video in the GL enabled Projector actors then you need to turn that key information into an alpha channel for the video.
Above you will fine a link to three actors that I have used to do this conversion. They do the job, though I would expect a free frame or native Isadora actor could do the job better and faster. The biggest problem with these is the synchronization of the video stream and the alpha stream. I have found that for me there is a 1 frame lag for each video processing actor that I put the video through so The Chroma and Luma actors need a 2 frame delay, and the threshold a 1 frame delay. But this is still not perfect and can still cause some out of sync issues. In other words “your mileage may vary”.

please feel free to use these and let me know how it goes, and if there are any optimizations or further documentation necessary.

Recently someone on a mailing list asked about DLP vs LCD projectors, and since I happen to have some opinions I though I would share.
It’s impossible to say what’s best, and comparisons of high and low end projectors will give vastly different results, but this is based on my experience using a large variety of affordable desktop projectors in the 1000 - 3500 lumen range.

First off ANSI lumens are reasonably comparable between projectors for the most part.
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PERFOMANCE: MARCH 24th 10:00PM $5
@ ST. MARK’S CHURCH 131 EAST 10TH ST.

DEBURU
Directed by Yuto Kurosaka (Japan)

GAZE IN DATIVE CASE
Directed by Fulya Peker (Turkey)

BLUE EYES, RED VELVET
Directed by Stephen Mosblech (USA)

JAPANESE LESSONS
Directed by Eduardo Band (Brazil)

DPI is pleased to be able to assist Yuto Kurosaka present his work with the use of a DPI projector.

http://lemurplex.org/classes.html
CLASSES BEGIN: April 10th thorugh April 30th , 2007

Build Your Own Music/Video MIDI Controller:
Creating a Sensor Instrument with MidiTron

Advanced Jitter: Beyond the Filters

Intermediate Microcontroller Programming for Artists:
Going Further with the Arduino System

Fun With Fiberglass: Basic Composite Fabrication

Robotics Control for Kinetic Art: Electronics and Software

Handmade music night!
March 22nd @ ETSY

Wow and I almost missed it!

http://www.vampirecowboys.com
PERFORMANCED: March 15 = April 8 2007

Vampire Cowboy is committed to building a community of artists who are soaked in the cultural bloodstream of the now.
Men of Steel spins the superhero genre on its head.

http://www.chashama.org
DEADLINE: April 6 2007
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http://tranzducer.com
PERFORMANCE: March 23rd 2007 8PM - 11PM

Tranzducer.003 features Damon Holzborn’s improvised musical textures, “peace noise” composer and improviser Joseph Grimm (a.k.a. The Wind-Up Bird) and “sine wave sensualist” Zach Layton. Interactive art work by LEMUR artists and founder Eric Singer will also be on display. Admission is $5.

Projector Central

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http://www.harvestworks.org/
LECTURE: March 7th 2007 @ 6:30PM

Claudia Robles will talk about SEED/TREE a Butoh Performance with Live Electronics Produced at the institute for Music and Acoustics - ZKM (Center for Art and Media) in Karlsruhe.
In SEED/TREE feelings, associations, mental images and spontaneous impulses are the starting point for the creation of stories, games, and choreography.