Exporting to PNG file options

PNG is a very versatile image file format, supporting multiple bit depths and true alpha channel transparency.

·	When selecting the 8 bit option, the resulting PNG file is similar to an 8-bit GIF with a color palette.

·	When selecting the 24 bit option, there is no degradation in the image pixels (perfect quality), but the file size will be higher than a JPEG file.

·

When selecting the 32 bit option, the image is saved along with an alpha channel, which indicates the transparent areas around your button. If you plan to use your exported images on a web page, you should bear in mind that certain browsers (most notably Microsoft Internet Explorer 6.x or earlier versions) may not display your images correctly (e.g. they may display transparent areas as gray). To work around this browser bug, we employ a popular "hack" to enable you to view these images in Internet Explorer in the right way, too. This "hack" involves the use of a special feature of Internet Explorer, a custom CSS attribute called "filter" as in the following example:

Use:

<div style="position:absolute; left:140px; height:32px; width:128px;

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(

src='image.png', sizingMethod='scale');" >

</div>

instead of:

<img src="image.png" width="128" height="32" border="0">

In the case of a 3-state button (rollover) the sample code we provide during the export process will include the necessary code if you select the Javascript option.

   
   

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