Nov 19, 2008
Using .PNG and their ability to preserve transparency
The use of .PNG is not widely used throughout my work. The advantages of using .PNG files are as follows:
- Gamma Correction
- Smaller file sizes (sometimes)
- Loss-less compression
- Up to 48-bit color
- True alpha transparency*
*Alpha transparency allows for pixel transparency to range from 0% to 100%, allowing images to blend images together easily and create a seamless look (opposite of GIF transparency, where its 0% or 100%)
The problem lies in the cross browser variable opacity. The latest versions of the major browsers fully support alpha transparency with PNG – namely, Netscape 6, Opera 6, and recently released Mozilla 1, all on windows; and, for the Mac, Internet Explorer 5, Netscape 6, Opera 5, and Mozilla 1.
Too bad there is a debacle of support in IE 6 and below.
Getting PNG to work should not be this hard. IE includes a proprietary filter makes .png transparency possible, called AlphaImageLoader.
Why use the transparency when creating an image in PS would be so much easier? Because by using transparency over images where you plan on inlaying text, the text being used will help contribute to content and keyword density. Squeeze your website for that juice, to the very last drop.





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