pstoedit translates Postscript and PDF files to various editable vector graphic formats including tgif, xfig, PDF graphics, gnuplot format, idraw.
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potrace – transforming bitmaps into vector graphics
potrace is an open source utility for tracing a bitmap, which means, transforming a bitmap into a smooth, scalable image.
Read moreCropGUI – gtk frontend for lossless cropping of jpeg images
CropGUI is an open source graphical user interface for jpegtran, a command-line tool that performs various useful transformations of JPEG files.
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