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Ubuntu apps: IMDrops Image Tools is a screen capture and file sharing tool.

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http://linuxlandit.blogspot.com – Image Tools is a screen capture and file sharing tool. It features multi-threaded batch image resizing, conversion, cropping, flipping/rotating, watermarks, decolorizing (grayscale, negative, sepia), and optimizing.  The BMP, GIF, TIFF, JPEG and PNG image types are supported.  It is compatible with MONO (only for GNOME). Multicore processing is supported to increase performance. The quality for output when optimizing is variable.  Color channels can be filtered.  An internal benchmarking tool is available. Indexed pixel format images can be processed. (HowTos)