QGifer – A video-based animated GIF creator
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Features
GIF extraction from a video file
Color palette editor
Variable color palette support
Dithering
Text rendering
Graphics insertion
Object interpolation
Cropping
Filtering
Looping by appending reversed copy
GIF optimization through ImageMagick
Project management
Translations: English, Swedish, Japanese, Polish, Russian
Install qgifer in ubuntu
Open the terminal and run the folowing commands
sudo add-apt-repository ppa:samrog131/ppa
sudo apt-get update
sudo apt-get install qgifer
Screenshot