Optimizing Animated GIFs / Preview and Tweak
Preview and Tweak
Optimizing Animated GIFs
Preview your animation by choosing Animation | Start. Tweak your interframe delay to get the effect you want and reposition individual frames. You can also see the effect of the bit depth and remove unused colors settings. To move forward or backward through the animation press the up and down arrow keys.
To preview your animation under real-world conditions, try a bandwidth simulator. GIFMation 2.0 includes a unique integrated bandwidth popup with their preview feature (Frames | Play Animation) that simulates how your animation will behave at various connection speeds.
The Hidden Frame Trick
The trick is to declare two rows in the FRAMESET tag (ROWS="100%,*") and define only one frame. This does not cause any errors, it simply displays the frame you define. By dynamically generating the frameset based on the browser type you can automatically direct users to different pages. The page appears to be a normal HTML page when it is in fact a single frame.
To see the finished product, go to Cool Central's site of the page.
GIF89a Browser Support
- Netscape 3.0 fully supports animated GIFs and has no memory leak
- Netscape 2.0x fully supports animated GIFs, but has a memory leak and may bomb on some GIF89as. Netscape 2-3.x do not support the "restore to previous" disposal method, and treat it like "do not dispose."
- Explorer 2.0 supports one loop full-frame animated GIFs
- Explorer 3.0 support one loop positioned animated GIFs and the "restore to previous" disposal method.
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Comments are welcome
Created: October 7, 1996
Revised: Oct. 18, 1999