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	Walker Effects Manual: Alpha Tool (Site not responding. Last check: 2007-11-06)
		Alpha Tool is a utility for creating and manipulating alpha channels with respect to image color.
		In After Effects, the alpha channel represents the layer's transparency and is handled differently than the red, green and blue channels.
		The preexisting alpha channel is replaced by the new one generate from luminance.
	www.walkereffects.com /support/manual/alphatool (1024 words)

	Tutorial: The Alpha Channel
		Alpha channels are masks through which you can apply effects.
		The alpha channel is an 8-bit channel, which means it has 256 levels of gray from 0 (fl) to 255 (white).
		There are no colors available in the alpha channel because it is not an image, or part of the image.
	www.bertmonroy.com /tutorials/text/17_alpha.htm (364 words)

	[No title]
		Alpha channels are displayed over a background color or transparency, depending on the view mode.
		Premultiplied color channels combine the color information with the alpha channel information by using a specific color as a base, almost always white or fl.
		Deselect this option to interpret the alpha channel as a straight alpha channel (that is, a 256-level grayscale image embedded in the file).
	web.tiscali.it /olgab/07_Channels14.html (413 words)

	Alpha Channels \| premultiplied, straight and uncorrelated
		In this case, when you use the alpha channel to unnecessarily extract the foreground from its fl background, you pull in gray around the edge, creating a matte line.
		To use such an alpha channel, one must emulate the behavior of a film optical printer — one must run the fl core matte as a holdback for the background, and then add the foreground as a burn-in, or a "DX" (a double exposure).
		Invert (~) the alpha channel and multiply (*) it by the background.
	www.digitalartform.com /alphaChannel.htm (679 words)

	Custom Alpha Channels By Cocobolo DTD
		Alpha channels allow you to vary the transparency of any model texture in game.
		Alpha channels are fl and white, with white being the opaque areas, and fl being the transparent.
		Note that this is taking place only in the alpha channel, the other channels are not visible or selected.
	www.planetrainbowsix.com /DTD/alpha_tutorial1.htm (364 words)

	Alpha Channel Tutorial
		First, let's explain what the alpha channel is. In basic terms it is a 'layer' of the tga file that tells the game engine what will be visible and what will not.
		In this case the alpha channel is used to tell the game which protrusions/cape parts to leave out of the rendering process.
		Problem is that the alpha channel is still set to the default outline for all the bits and pieces.
	www.geocities.com /skingalltut/alphatut.htm (947 words)

	Alpha Channels (Site not responding. Last check: 2007-11-06)
		In order to understand Alpha channels, you must first understand what a channel is. I will try to explain this by using an image in Photoshop that is being displayed in RGB mode.
		The Alpha channels are basically templates for a selection that you have set up in an image.
		The difference between a normal selection and an alpha channel selection is the ability to save and copy, the selection, across to other images.
	www.geocities.com /tonychilvers/alphachannels (425 words)

	Digital Juice Magazine -February2005-Understanding Alpha Channels
		Alpha channels are digital bits of information that allow you to use variable transparency to composite multiple layers of video and animation, which is a fundamental part of build eye-catching images.
		Alpha channels allow you to use variable transparency, which provides a range of transparency between values of 0 and 255.
		Alpha transparency is often indicated with a checkbox pattern in the background of the preview window (Figure 2).
	www.digitaljuice.com /magazine/articles/2005_02_alpha.asp (633 words)

	UnrealWiki: Alpha Channel
		Alpha channels use fl for transparent areas, and white for opaque areas.
		Alpha channels are used to simulate 3D geometry without increasing the number of physical polygons.
		It only has a 4-bit alpha, instead of the 8-bit TGA alpha channel, but compression with DXT is much better and in most cases quality isn't much of an issue with alpha channels.
	wiki.beyondunreal.com /wiki/Alpha_Channel (1213 words)

	Alpha compositing - Wikipedia, the free encyclopedia
		are the alpha of the pixels in elements A and B respectively.
		Alpha blending is a convex combination of two colors allowing for transparency effects in computer graphics.
		The alpha component may be used to blend to red, green and blue components equally, as in 32-bit RGBA, or, alternatively, there may be three alpha values specified corresponding to each of the primary colors for spectral color filtering.
	en.wikipedia.org /wiki/Alpha_channel (570 words)

	Computer Editing: Keying, Alpha Channels and Mattes
		Thus, the alpha channel was born, but only in specific 24-bit formats.
		Alpha channel mattes are useful in many situations, but they really shine when you apply them to titles.
		Alpha channel composites and keys are just two of the tools used in the creation of video composites.
	www.videomaker.com /article/9021 (1364 words)

	Canvas Illustrated - May 2005 - ACD Systems of America (Site not responding. Last check: 2007-11-06)
		This article is the first in a series that covers all aspects of image channels, including the Channels palette, color channels, alpha channels, selection masks, channel masks, transparency effects, and image editing techniques.
		A composite channel is merely a combination of all the color channels and should be labeled RGB or CMYK.
		An alpha channel is a grayscale channel that is the same size and resolution as the paint object in which it is stored.
	www.deneba.com /community/newsletters/may2005/channels.html (1050 words)

	Dummies::Using Alpha Channels with Photoshop 7
		Alpha channels define a selection in fl, white, and varying shades of gray pixels.
		In alpha channels, selected pixels are white, fl pixels are unselected, and anything in between is partially selected or partially unselected depending on whether you think the glass is half full or half empty.
		Your alpha channel is complete and appears in the Channels palette.
	www.dummies.com /WileyCDA/DummiesArticle/id-1616,subcat-MULTIMEDIA.html (866 words)

	Alpha Channels
		Typically, this channel is of the same bit-depth as the others, but GD's alpha channel only supports values from 0 to 127.
		Alpha Channels are only supported in true color images.
		In blending mode, the alpha channel component of the color supplied to all drawing functions determines how much of the underlying color should be allowed to shine through.
	www.nyphp.org /content/presentations/GDintro/gd21.php (437 words)

	Alpha channel (Site not responding. Last check: 2007-11-06)
		Although the whole Alpha channel technique is generally credited to Thomas Porter and Tom Duff back in 1984 while they where working on composition techniques for the Star Trek film "The Wrath of Khan".
		Other articles appeared before that which described the use of Alpha Channels for compositing but the Porter and Duff article is the one which completely generalized the use of alpha blendings.
		For a detailed overview of the history of the development of the alpha channel, see "Alpha and the History of Digital Compositing" by Alvy Ray Smith.
	www.ypoart.com /tutorials/Alpha-about.htm (1579 words)

	Copy/Paste alpha channels
		Alpha channels are widely used in modern icon creation.
		The main advantage of alpha channels is that it permits to display a smooth transparency in icons.
		Each channel is coded using 8 bits per pixel.
	www.axialis.com /docs/iw/Copy_Paste_alpha_channels.htm (251 words)

	Tutorial: Alpha Channels and Layer Masks
		If you had made an Alpha channel when you selected the original sky, you wouldn't be in this predicament.
		As a grayscale channel, the Alpha channel contains 256 levels of gray, which can be very useful.
		White in the Alpha Channel exposes an image to an effect.
	www.bertmonroy.com /tutorials/text/32_mask.htm (643 words)

	Alpha Channels
		However, opacity alpha channels are not what we see in the Photoshop Channels palette.
		The alpha channels we see in the Channels Palette are used to store masks and selections.
		The fifth layer is a typical alpha channel.
	www.zuberphotographics.com /page_AlphaChannels.htm (302 words)

	Alpha Stuff
		Channels are easiest to think of as grayscale files, each pixel's brightness value translates to the intensity of the corresponding color.
		Each channel is made up of 256 levels of gray (8 bits), when all four channels are combined they can create over 4 billion combinations of color and transparency (32 bit color).
		In the alpha channel anything that is near white or pure white will allow the colors from the background layer of the image to show up in the decal (as shown on "My rendered AM Image").
	www.am-guide.com /TinCan/AM_&_Alpha.htm (1659 words)

	Alpha Channel Textures - HalfLife 2 Knowledge Base
		To do this, clic on the channels Red, Green, and Blue, then select the one which show the image as white as possible.
		In this case, the blue channel is the best to choose.
		Drag the blue channel to the small white box at the bottom right of the Channels window, and you get the alpha channel it appears in the channels window, called "blue copy".
	www.hl2world.com /wiki/index.php/Alpha_Channel_Textures (435 words)

	Director Online Article: Shining a Flashlight with Alpha Channels
		All we need to do is set the alpha channel of the entire image to 0, thus making it all invisible and transparent.
		Then, if we place a circle of fl in the middle of the alpha channel, we get a portion of the image that is visible.
		The actual alpha channel is altered by using a 256-color grayscale bitmap in the Cast.
	director-online.com /buildArticle.php?id=832 (485 words)

	Travel Mattes Alpha and Luma and the Alpha Channel
		An Alpha channel is a fourth channel which is created by FCP and deals only with luma information and is comprised of 256 levels of gray.
		The Alpha channel carries information about which areas of the image (in the three color channels) will become transparent, which areas will remain non-transparent, and all the semi-transparent values in between.
		If you have a Premultiplied Alpha channel and are using it as a Straight Alpha channel you will have artifacting of white and colored pixels along the border where the transparent and non-transparent areas meet.
	www.kenstone.net /fcp_homepage/basic_travel_mattes.html (2255 words)

	Adam's Transparency Tutorial (Alpha channels and more)
		And because this alpha channel is 8-bit, 256 levels, it can have 256 levels of transparency from fl/100% transparent to white/100% opaque.
		The channels of an image are shown in the Channels tab (next to the layers tab) on the layers palette.
		PowerPoint And Alpha Channels tutorial by MVP Geetesh Bajaj that describes alpha channels, their usage and creation - as well as their role in the PowerPoint scheme of things.
	www.rdpslides.com /pptfaq/FAQ00190.htm (1115 words)

	powerpoint and alpha channels - indezine.com - graphics presentations
		And now there's an article on 'alpha channels' - it's difficult to find the word instanced in the PowerPoint help file or the manual - and yet here's a full page of juicy, interesting information on alpha channels here for you to devour.
		A lot of readymade stock photos are available in the TIF format with readymade alpha channels (clipping paths) you could insert straightaway into PowerPoint.
		Your alpha channel equipped PNG or TIF files may appear dithered in PowerPoint - this isn't a cause for worry, since they appear with their fidelities intact in show mode.
	www.indezine.com /products/powerpoint/ppalpha.html (1327 words)

	woodylidstone.com: Desk: Alpha Channels & Soft Drop-Shadows: Creating an Alpha Channel
		The process in a nutshell is to open your image in Photoshop, make sure it's an RGB image, mask off the area you want to use as an alpha channel, and create the alpha channel using the mask.
		In an Alpha Channel, anything that's white is transparent to Media Composer while anything fl is opaque (solid).
		To view the RGB channels, click the channel name "RGB." This turns off viewing of the alpha channel and turns on viewing of the RGB channels, which show the actual, colored image.
	homepage.mac.com /woodylidstone/dropshadow_ps/creating_alpha.html (306 words)

	Create a Transparent Image with Alpha Channel - Tutorial
		Alpha channels are masks through which you can display images.
		Alpha channels are usually used with 16.8M color RGB images.
		In the illustration below you see how the alpha channel is applied to the original image to remove (visually) the orange gradient background.
	www.axialis.com /tutorials/tutorial-misc001.html (645 words)

	Using Alpha Channels to Create Big Blinkie Templates
		Alpha channels are very handy and give more precise results than using the Magic Wand tool to get selections.
		Another really cool thing about using alpha channels is they're available whenever you open the PSP image in which you saved them.
		Nor does loading a selection from an alpha channel in one image to a new image move or copy the alpha channel to that image.
	suzshook.topcities.com /tutorials/tempbigblinkie (2260 words)

	Intro to PNG Features
		Also known as a mask channel, an alpha channel is simply a way to associate variable transparency with an image.
		Alpha blending allows one to use anti-aliasing--creating the illusion of smooth curves on a grid of rectangular pixels by smoothly varying the pixels' colors--to make rounded and curved images that look good against any background, not just against a white background (for example).
		A PNG alpha-palette image is just that: an image whose palette also has alpha information associated with it, not a palette image with a full alpha mask.
	www.libpng.org /pub/png/pngintro.html (3204 words)

	Some cool stuff with alpha channels
		Note that we could have applied the text into the alpha channel directly from the Text tool (not available in v1.2), but we wanted to first rotate the text, so that's why we loaded it into a brush, and then we selected Brush>Store/Manage...
		We painted a few strokes and the grass appeared on the outside of the text, but didn't enter the inner side of the text, because that's where the alpha channel blocks it.
		In the second example, the Text was applied directly to Alpha, without the need for rotation, but then a Blur Alpha effect was applied, in order to smoothen the transition from disabled (blocked) pixels outside the selection to pixels which are free to change color inside the selection.
	www.thebest3d.com /dogwaffle/whatscool/alphatrick1.html (524 words)

	creativepro.com - Photoshop How-To: Lens Blur with Alpha Channels (Site not responding. Last check: 2007-11-06)
		The key to Lens Blur is an alpha channel, a channel in the Channels palette that you use to control where and how strongly the filter will be applied.
		Where the channel is fl, the image is protected from change and the filter won't be applied.
		Note in the lower image, where the alpha channel alone is visible, that I've painted all of the tree on the left the same shade of gray - the entire tree is pretty much the same distance from the lens.
	www.creativepro.com /story/feature/22413.html (706 words)

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