PictView32 Console version 

Fast command-line driven image converter supporting over 50 input formats and 21 output formats. Palette, reductions, resizing etc. Batch conversion is supported.
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AB Picture Converter 

It allows you to read and view image files in 63 formats and convert them to 27 formats. You can apply over 15 effects, adjust colors, contrast, brightness, etc. It supports scanning and printing. A screen capture engine is also included.
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