Alpha channel......
Few days ago, I wanted to put an image while
generating PDF by using FPDF, I got an error that said 'Alpha channel is
not supported'. I got stunned and started to think what is it?
In
Computer Graphics , Alpha channel is used as an opacity channel. Alpha
channel will ensure that how much your image will be transparent or not
and it is an additional channel that can be added to an image which
contains transparency information about the image. Depending on the type
of alpha it can contain various levels of transparency. In PNG/TIFF
alpha channel represents up to 256 levels of transparency.
A 32
bit graphics system contains four channels where three 8 bit channel are
for Red,Green,Blue (RGB) and one8 bit alpha channel. So alpha channel
is simply use of RGB model with extra information. Alpha channel values
can be expressed as a percentage, integer, or real number between 0 and 1
like RGB parameters.If a pixel has a value of 0% in its alpha channel,
it is fully transparent (and, thus, invisible), whereas a value of 100%
in the alpha channel gives a fully opaque pixel .
The following are the file type that support alpha channel:
* TIFF * TGA * PNG * PSD (Photoshop) * GIF (special alpha)
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