PNG (Portable Network Graphics) is a still-image file format developed for use with the Internet and World Wide Web. 
         
         
            
            Interface
            
            
            Clicking Render or Setup in the Render Output File dialog displays the PNG Configuration dialog. 
            
            
            - Optimized palette (256)
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                     Choose to render a smaller, 8-bit color file. 
                      
 
- RGB 24 bit (16.7 Million)
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                     Choose to render a true color (24-bit) file. 
                      
 
- RGB 48 bit (281 Trillion)
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                     Choose to render a 48-bit color file. 
                      
 
- Grayscale 8 bit (256)
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                     Choose to render a grayscale image with 256 shades. 
                      
 
- Grayscale 16 bit (65,536)
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                     Choose to render a grayscale image with 65,536 shades. 
                      
 
- Alpha Channel
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                     Turn on to save the alpha channel with the file. 
                      
 
- Interlaced
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                     Turn on to make the file interlaced for faster display in Web browsers.