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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Microsoft GIF Animator Example for Creating RF Cafe Advertising Banners

The animated GIF (AGIF) on the left (below) was created using Microsoft's "GIF Animator" freeware. Four views are provided with a delay between each view. Rather than simply combining four separate, full-size images, only the parts that change each time are used. As you can see from the individual files sizes, the final AGIF is much smaller in file size than if four full-size GIF images had been used instead (it would have been ~128 kBytes).

MS GIF Animator example - RF Cafe
<click for larger version>

This AGIF is composed of 4 images. The base image is full size (120x600 px). It displays initially by itself for 1 second. Then, image #2 displays for 1.8 seconds. Note that it is 116x130 px and is positioned at x=2 px and y=5 px. Image #3 is 114x98 px and is positioned at x=3 px and y=150 px, and displays for 1.8 seconds. Image #4 is 113x98 px and is positioned at x=3 px and y=260 px, and displays for 1 second (its parameter screen is not shown in screen capture). Then, the whole cycle repeats endlessly. Note that the three small images are superimposed over the base image using the "Transparency" check box, where the white background color for those three GIF images has been defined as transparent.

32.2 kBytes
MECA Electronics AGIF 120x600-pixel banner (complete) - RF Cafe
26.5 kBytes
MECA Electronics AGIF 120x600-pixel banner (base image) - RF Cafe
2.25 kBytes
MECA Electronics AGIF 120x600-pixel banner (1st small floating image) - RF Cafe

1.63 kBytes
MECA Electronics AGIF 120x600-pixel banner (2nd small floating image) - RF Cafe

1.80 kBytes
MECA Electronics AGIF 120x600-pixel banner (3rd small floating image) - RF Cafe

Posted July 16, 2015 

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