clker logo
   Upload   SignUp   Login
Add clker.com to your search providers
upload images

Lacy Spice 0506 V image

You're here:  Home > blue > and > to > red > green > images > the

Shared by: Bjorn Johansen
since Friday, 31-May-13 04:02:40 PDT

   Share on facebook    HTML embed   Edit and draw this image

Lacy Spice 0506 V Image
Lacy Spice 0506 V
By: Bjorn Johansen
5.0/10 0


Log in to add tags

How Does Alpha Channel Work?
Using Alpha Channel to Blend Image on a Background Smoothly
What is a channel?First, let's talk about channels in general. Depending on the color mode used a color image automatically has either three or four channels. If you are using the RGB color mode (used for anything viewed on a screen) the image has three channels; red, green and blue. If you are using the CMYK color mode (used for printed materials) the image has four channels. The information within these channels, specify how much of each color is used to make the output color, such as indigo, orange, pink etc. These channels are standard in any color image.
What is an alpha channel?The alpha channel is an additional channel that can be added to an image. It contains transparency information about the image, and depending on the type of alpha it can contain various levels of transparency. The alpha channel basically controls the transparency of all the other channels. By adding the alpha channel to an image you control the transparency of the red channel, green channel and the blue channel.There are two types of alpha channels, pre-multiplied alpha and straight alpha. Which alpha type you use depends on the software being used.
Pre-multiplied Alpha (used by Photoshop)Straight AlphaPre-multiplied alphaIn this case the colors of the foreground are blended with the colors of the background. At the same time the alpha blends from opaque to transparent.Straight alphaIn straight alpha the foreground and background colors stay the same, and only the alpha channel is blended.
File types that support alphaThe following are the file type that support alpha channel: TIFFTGAPNGPSD (Photoshop)GIF (special alpha)TIFF, TGA, PNG, PSD and GIF all support alpha but really only PNG and GIF are used for applications, and the web. Gif, however, uses a special type of alpha. Instead of the alpha channel in a GIF image containing degrees of transparency it only has an on/off transparency. This means that pixels within a GIF image can either be fully opaque or fully transparent. There is no in between. PSD is the Photoshop format, and can be used in most Adobe applications.
How is the alpha channel used?The alpha channel can be used in several different ways. In many instances the alpha channel is used to seamlessly layer images over any color background or over other images. This is seen constantly in image editing software such as Photoshop. When you open an image and place another image on top Photoshop automatically translates the alpha so that the image is properly anti-aliased and looks smooth and crisp. In other cases elements such as shadows can be properly displayed over various backgrounds, and images. Photoshop also uses alpha channels to hold clipping masks and selection areas. Alpha channels can also be used to display semi-transparent images over backgrounds, images and even other semi-transparent images.
What are the benefits of using alpha channels?The biggest benefit of using alpha channels is visual appeal. Without alpha channels images layered over one another would not be anti-aliased, and therefore, would have a blocky jagged edge to them. This is not at all attractive. Another benefit of alpha channels is speed. When you save an image with the alpha channel all of the opacity levels are saved with it. You can then place that image over anything you like and the image will still maintain its appearance. This saves time because you can place the image directly over a background without the need to save that image in exactly the right spot over that exact background.
Notice in order to keep the shadow the GIF alpha must display a matte color behind it, while the PNG alpha only displays the semi-transparent pixels.
Related Articles
Everything You Wanted to Know About Icons and Icon Designing
Familiarize Yourself With These Basic Concepts in Icon Designing
Network Database Icons
Accounting Software Icons
Email Application Icons
Navigation Icons
Web Icons
People and Objects
Conceptual Icons
E-commerce Icons
General Articles
Everything You Wanted to Know About Icons and Icon Designing
Using Alpha Channel to Blend Image on a Background Smoothly
Familiarize Yourself With these Basic Concepts in Icon Designing
Do it Yourself Tips
Add Fav Icon to Your Website in Three Easy Steps
Converting Icons from Raster to Vector Format
Design Tutorials
Learn how to Create an XP Style Button Icon
Using Icons
Which Icon Formats and Sizes Should You be Using?
About us
XP Icons

Log in to add comments
Related clip arts and images
Blue Light H Clip Art
Blue Light H
By: Bjorn Johansen
Elcomsoftboxshots Clip Art
By: Bjorn Johansen
Battleship H Clip Art
Battleship H
By: Bjorn Johansen
Pure Flat 2013 Wordprocessing Total Snapshot 64 Clip Art
Pure Flat 2013 Wordprocessing To...
By: R A Hawley
Preview 13 Clip Art
Preview 13
By: master
Ip Icon Sample Ikon5 Clip Art
Ip Icon Sample Ikon5
By: Frantz Leuenberger
Cam Len H Clip Art
Cam Len H
By: Bjorn Johansen
Iron Man S Image
Iron Man S
By: Bjorn Johansen
Kelly Andrews 0924 L Image
Kelly Andrews 0924 L
By: Bjorn Johansen
Lacy Spice 0506 V Image
Lacy Spice 0506 V
By: Bjorn Johansen
Leopard S Image
Leopard S
By: Bjorn Johansen
Thumb Lg 70 Image
Thumb Lg 70
By: Bjorn Johansen
Breathless L Image
Breathless L
By: Bjorn Johansen
Ghost Protocol L Image
Ghost Protocol L
By: Bjorn Johansen
Harley Quinn F Image
Harley Quinn F
By: Bjorn Johansen
Keira Knightley 02 V Image
Keira Knightley 02 V
By: Bjorn Johansen
Marvel Vs Capcom F Image
Marvel Vs Capcom F
By: Bjorn Johansen
Bicycle 9 Image
Bicycle 9
By: R A Hawley
Crown 11 Image
Crown 11
By: Frantz Leuenberger
Ip Icon 08 Snapshot D Image
Ip Icon 08 Snapshot D
By: Frantz Leuenberger
48x48 Find 1 Image
48x48 Find 1
By: Lawrence Hong
Battery Yellow 33 1 Image
Battery Yellow 33 1
By: R A Hawley
Currency Dollar 15 Image
Currency Dollar 15
By: Frantz Leuenberger
Ip Icon 06 Icon Sample1 Image
Ip Icon 06 Icon Sample1
By: Frantz Leuenberger
6 260x175 Winflash Educator Main Icon For Scholar Edition Of Winflash Educator Image
6 260x175 Winflash Educator Main...
By: Jon Skillingstad
Corvette Z06 S Image
Corvette Z06 S
By: Bjorn Johansen
Astronaut 5 Image
Astronaut 5
By: louise tiscareno
Mindy Weaver Image
Mindy Weaver
By: master

Main categories

Add clker.com to your search providers