Four websites let you to create animated gif videos online

Little bit about GIF file format

The Graphics Interchange Format (GIF) is a bitmap image format that was introduced to computer world by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability.

The format supports up to 8 bits per pixel thus allowing a single image to reference a palette of up to 256 distinct colors. The colors are chosen from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images available with continuous color, but it is well-suited for simpler images such as graphics or logos with solid areas of color.

GIF images are compressed using the Lempel-Ziv-Welch (LZW) lossless data compression technique to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. Controversy over the licensing agreement between the patent holder, Unisys, and CompuServe in 1994 spurred the development of the Portable Network Graphics (PNG) standard; since then all the relevant patents have expired.

Aminated GIF

A series of static GIF image that can be animated by combining several images into a single GIF file as each described by its own GCE (Graphic Control Extension), preceded by a header whose content by default applies to all the frames. After the header the data is stream-oriented instead of being at fixed indices, so the location of the start of a GCE depends on the length of preceding GCE(s).

Following websites let you to create animated gif videos online.


http://picasion.com/



http://gickr.com/



http://gifninja.com/



http://www.loogix.com/