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Topic: Keying (graphics)


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  Keying
In graphics[?], keying is an informal term for compositing two full frame images together, by discriminating the visual information into values of color and light.
Chroma keys are done most commonly in front of a bluescreen or greenscreen, because those colors are easiest to avoid in clothing and flesh tones.
A matte key uses three images: the two images that will be composited, and a fl-and-white third image that dictates the blending of the two, with white revealing one image, fl the other, and grey revealing a blend of the two together.
www.ebroadcast.com.au /lookup/encyclopedia/ke/Keying.html   (301 words)

  
 Keying (graphics) - Wikipedia, the free encyclopedia
In graphics and visual effects, keying is an informal term for compositing two full frame images together, by discriminating the visual information into values of color and light.
A difference key uses a background plate of the scene that the foreground object is being keyed out of and the software then assesses the source video and any pixels that don't match the grid are obviously meant to be keyed out.
A matte key uses three images: the two images that will be composited, and a fl-and-white third image (called "mask") that dictates the blending of the two, with white revealing one image, fl the other, and grey revealing a blend of the two together.
en.wikipedia.org /wiki/Keying_(graphics)   (399 words)

  
 "2D Programming in a 3D World: Delveloping a 2D Game Engine Using DirectX 8, Direct3D"
And the use of a series of sprites to represent an object, for instance a number of different facings of a unit, allow the simulation of animation and action when they are drawn in sequence.
The fundamental programming process for 2D graphics is the blit -- bit block transfer -- which is used to move the bit image of a sprite onto the display area.
Finally, to provide a smooth transition of the display from frame to frame, graphics operations (primarily blits) are usually done to a back buffer, which is basically a working copy of the screen area.
www.gamasutra.com /features/20010629/geczy_01.htm   (1069 words)

  
 Color Keying in DirectX 8 Graphics
The conversion to DirectX 8 Graphics from DirectDraw poses a few challenges, and one apparent stumbling block is the lack of direct support for color keys.
The use of source color keying in DirectDraw was commonly used to draw sprites with transparent regions, by not drawing pixels of an application specified color when blitting a bitmap.
Rather than supporting color keys, DirectX 8 Graphics relies on the use of a separate alpha channel in the source image to specify the amount of opacity / transparency of each pixel.
www.mvps.org /directx/articles/colorkeydx8.htm   (400 words)

  
 Graphics Tablets .::OneVideo::.
A graphics tablet (or digitizing tablet) is a computer peripheral device that allows for a relatively simple method of inputting hand-drawn graphics or art into a computer in real time.
The final evolution in the graphics tablet is the pressure-sensitive pad.
In these devices the X and Y grids are separated by a thin insulator, and when the pad is pressed the two wires come into contact at the pressure point.
www.onevideo.co.uk /hardware-graphics-tablets-c-1_22.html   (198 words)

  
 Keying - Wikipedia, the free encyclopedia
The word keying has a number of meanings:
keying (telecommunications) is a form of modulation where the modulating signal takes one of two or more values at all times.
keying (vandalism) is using a key to scratch the paint on car as a form of vandalism.
en.wikipedia.org /wiki/Keying   (164 words)

  
 Computer Glossary-Computer Video and Graphics - PC Terms about Computer Video Graphics-Best Computer Online Store ...
Chroma Keying or texture transparency is the ability to recognize a key color within a texture map and make it transparent during the texture mapping process.
Since not all objects are easily modeled with polygons, chroma keying is used to include complex objects in a scene as texture maps.
In raster graphics architecture a primitive is formed by scan conversion where each scan line intersects the primitive at two ends, P left and P right.
www.directron.com /videoglossary.html   (2463 words)

  
 Graduate Course Descriptions : M.S. in Digital Imaging and Design: Y35
Importing graphics for advanced special effects work and image processing with an emphasis on aesthetics and design is the core of this course.
All the key elements that make up the concept of compositing and motion design are covered, including keying, creation of mattes, color correction, stabilizing, and tracking.
The key element of the course is for the student to give expression to an animated character.
web.scps.nyu.edu /bulletin/NYU/Courses/grad_course.html   (4541 words)

  
 [No title]
Some graphics systems do not use homogeneous coordinates; in these instances the z depth value can be used in lieu of the w coordinate, assuming that the z value is positively increasing into the screen.
The Voodoo Graphics hardware allows the origin to be in the upper left or lower left corner of the screen.
The Voodoo Graphics subsystem’s clipp ing window should not be used for general purpose primitive clipping; since clipped pixels are processed but discarded, proper geometric clipping should be done by the application for best performance.
www.gamers.org /dEngine/xf3D/glide/glidepgm.txt   (11328 words)

  
 COMPOSITING SOFTWARE
Until the digital era, compositing was nothing more than analog keying for the TV weather report and expensive matte work on film.
Compositing is where movie magic comes together, marrying separate elements into a seamless image, which may not always be possible to photograph in real life.
It's fine for keying graphics and extremely well lit green screen footage in video track two and above.
www.jamesarnett.com /guidebook/2-8-2-3.html   (331 words)

  
 OpenGL Color Keying - DevMaster.net Forums
It could blit graphics using specified color, that becomes transparent.
Some Color Keying technique would be most useful.
I shouldn't think the performance hit would be too bad, but if it is then you could always do this in advance and save the modifed video with alpha values.
www.devmaster.net /forums/showthread.php?p=9444   (1382 words)

  
 Mixing It Up: Video Mixers, SEGs and Special Effects Software
In a nutshell, chroma keying lets you replace a certain color in your video with an image or another video stream entirely (an effect commonly seen on the evening news, when the weatherman hovers over the computer graphics).
Luminance keying is essentially the same thing, only it works on the fl-and-white portion of the signal instead of the color.
It features 191 A/B wipe patterns, picture-in-picture, A/V fade, chroma and luminance key, and also sports a Scene Grabber that lets you grab a portion of a still or moving image from one video source and move it to another source.
www.videomaker.com /article/3069   (1801 words)

  
 QNX Technology Development Kits
The QNX Advanced Graphics TDK is a set of tools that allow system designers to build highly scalable, reliable and high performing 2D and 3D graphical environments using industry standards.
Within QNX Graphics Framework there are conceptual components used to divide the graphical environment in to an understandable hierarchy.
A device is a piece of graphics hardware, which is attached to and managed by io-display via the appropriate devg-* driver.
www.qnx.com /products/tech_dev_kits/3d_graphics.html   (2368 words)

  
 Graphics Cards For Your Worship Computer -- Tim Eason
Rather than using a video mixer with keying capabilities, it is recommended to use a scan converter with keying features to perform the overlay.
The VCR and computer graphics outputs are both connected to the scan converter/keyer.
Any graphic or text generated by a presentation program may be overlaid on top of live video.
www.churchmedia.net /CMU/articles/video/001.shtml   (928 words)

  
 Graphic Tips : Penfield Productions, Ltd.
We would prefer graphics laid out in RGB image mode but we can accept CMYK graphics if they already exist.
In post-production it is required that all graphics are created in a "safe area".
The purpose for this is to avoid graphics from being cropped out of the TV screen.
www.penfieldprod.com /PPL05/graphictips.htm   (275 words)

  
 [No title]
Direct3D is a 3D graphics library (sort of like OpenGl with the addition of high level 3d routines), and DirectDraw is the piece that provides applications with direct access to video memory.
For source color keying, a surface can be defined to have a certain color or range of colors defined as transparent.
Destination color keying is a property that comes into play on the surface that is being blitted to.
web.cs.wpi.edu /~matt/courses/cs563/talks/cbyrd/pres3.html   (3175 words)

  
 Chroma Keying for the Masses: Serious Magic Ultra | Tom's Hardware
This process, known as chroma keying, digitally replaces a background with either a still picture or with video, giving the illusion that the scene is taking place in a far-away city - or on a distant planet.
Many vendors sell a foldable chroma key backdrop that is blue on one side and green on the other.
True chroma key green or blue cloth will be very expensive, but your local fabric store probably has a similar color.
www.tomshardware.com /2004/10/28/chroma_keying_for_the_masses   (648 words)

  
 Avid Community Forums - keying nightmare
What I need to do is get a silhouette of the person and put a texture over them http://www.dismagwa.com/figures-in-positions.jpg (I’ve got each person as separate footage) so what I thought is to key the blue out and then use auto trace to get a mask…..
Keying on DV is always so tricky because of the 5:1 compression, lack of color recorded, and the fact that most DV cameras have only 1/2 inch or 1/3 inch CCDs.
Keying was so easy back in the old Analogue days because most Betacam SP cameras Had 2/3 CCDs And of corse Analogue is uncompressed by nature so it was no problem Key out through a switcher board.
www.avid.com /exchange/forums/thread/6223.aspx   (834 words)

  
 VertigoXmedia's Graphics System Enhanced With New Matrox DSX Technology
VertigoXmedia, a leading provider of broadcast graphics software and hardware, has designed a field upgrade for its VertigoXG character generator that creates the industry's first broadcast graphics engine with built-in standards conversion.
The VertigoXG is VertigoXmedia's full-featured graphics system that provides unsurpassed graphics rendering and playback performance in HD in a single- or dual-channel configuration, with or without HD clip playback.
Authoring is performed in Xstudio, an intuitive tool for creating data-driven, templated broadcast graphics in HD and SD by simply dragging and dropping from a customizable library of common broadcast elements such as lower thirds and OTS.
www.matrox.com /video/press/releases/vertigoxmedia_graphics.cfm   (723 words)

  
 The largest exhibition of the broadcast industry IBC'2002
And the best of all, the color keying software has been made amazingly easy to use by hiding all complex calculations behind a single "Build Key" button.
Lastly, in a few special cases when the automatic keying may not be desired, advanced users will be able to manually tweak keying parameters using the special control panel as required.
The preloaded 3D graphics data gets converted into the full D1 resolution, 32-bit color output images in real time by one of the most powerful 3D rendering engines in the world based on the renowned GeForce3 chip.
www.era-tv.com /events/2002/IBC/focus.asp   (840 words)

  
 Mentor Graphics Nucleus 802.1X SUP Software Helps Secure Critical Networks
The keying management features of the Nucleus 802.1X SUP software include Pairwise key handshake, Group key handshake, PMK (Pairwise Master Key) caching and Pre-shared keying.
Mentor Graphics Corporation (Nasdaq: MENT) is a world leader in electronic hardware and software design solutions, providing products, consulting services and award-winning support for the world's most successful electronics and semiconductor companies.
Mentor Graphics and Nucleus are registered trademarks of Mentor Graphics Corporation.
www.mentor.com /products/embedded_software/news/8021xsup.cfm   (573 words)

  
 ULTRA - Award-Winning Chroma Key and Virtual Set Software. Works with any Green Screen or Blue Screen
ULTRA 2 allows video producers to make powerful use of keying in the field, including less-than ideal environments like client offices and on-location events.
This technology is ideal when working with portable setups and compensates for keying nightmares, such as uneven lighting, wrinkled backdrops and frizzy hair.
ULTRA 2 will even preserve the shadows of your talent and achieve complex keys such as smoke, liquids and transparent objects with minimal effort.
www.seriousmagic.com /products/ultra/features   (374 words)

  
 Desktop Video: Digitize It
A common use for keying is to put a graphic over the shoulder of an anchorperson during a news program.
If you're keying the graphic over the right shoulder of the news reporter, your computer graphic must be in the upper right corner of the screen.
Black letters might look great when keyed over a picture of a sandy beach, but fl letters over a night sky wouldn't be legible.
www.videomaker.com /article/2356   (1931 words)

  
 /home/usr/bk/glide/docs2.3.1/GLIDEPGM.DOC
Voodoo Graphics is the first video subsystem that enables personal computers and low cost video game platforms to host true 3D entertainment applications.
Glide manages several logical hardware graphics buffers, all of which are based out of the same area of memory known as the “frame buffer”.
While the Voodoo Graphics hardware does not render polygons directly, Glide provides a set of polygon rendering functions that are optimized for the hardwa re.
www.gamers.org /dEngine/xf3D/glide/glidepgm.htm   (11892 words)

  
 Ultra 2
Preserve the shadows of your talent and achieve complex keys such as smoke, liquids and transparent objects with minimal effort.
For SD GPU Keying: 64 MB AGP or PCI-Express graphics card with 3D acceleration (GeForce™ 5700, Radeon™ 9600 or better card recommended).
For HD GPU Keying: 128 MB AGP or PCI-Express graphics card with 3D acceleration (GeForce™ 6600, Radeon™ 9800 or better card recommended).
dv411.com /smultra.html   (783 words)

  
 Keying Stock Images and Photos. 7397 Keying photography pictures available to download from over 100 stock photo ...
Key hole and a hand with a Key behind, Composite
White sliding doors with keys in the lock
Detail view of a key in a lock
www.fotosearch.com /photos-images/keying.html   (148 words)

  
 Greenscreen Techniques | Layers Magazine
I did this tutorial with 3 lights -- a Key light (main light on me), a backlight (sometimes called a "rim light"), and a diffuse light to attempt an even light on the greenscreen to avoid harsh shadows.
If your subject is fairly static, or if you have other things in the shot such as light poles or wires, you can create a garbage matte around the subject using the Pen Tool.
Be sure to leave enough space to choose the key color.
www.layersmagazine.com /video/greenscreen.php   (713 words)

  
 DirectFB -- a new embedded Linux graphics standard   (Site not responding. Last check: 2007-10-13)
DirectFB is a thin library that provides developers with hardware graphics acceleration, input device handling and abstraction, integrated windowing system with support for translucent windows and multiple display layers on top of the Linux Framebuffer Device.
It is a complete hardware abstraction layer with software fallbacks for every graphics operation that is not supported by the underlying hardware.
DirectFB adds graphical power to embedded systems and sets a new standard for graphics under Linux.
www.linuxdevices.com /links/LK9936231852.html   (506 words)

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