Simple Image Converter (SIR) is a small program with which we can resize images, rotate them or convert them to other formats. Its interface is simple and very intuitive. It supports, among others, the following formats: JPEG, JPG, PNG, BMP XPM, GIF, PBM, etc.
Although the sources can be downloaded from the official website, we can download the packaged program for Ubuntu from the Ubuntu PPA repository:
sudo add-apt-repository ppa: user / ppa-name
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