A simple way to convert images in Linux is by using the command line:
convert image.jpg newImage.gif
will convert the JPG file to a GIF file.
convert -quality 78% file.jpg
will set the quality of the JPEG file to 78%
convert -resize 800×600 file.jpg
will resize the image.
Alternatively, if you wish to use a GUI tool, try Phatch.
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Er, these are some nice, well-known convert (from ImageMagick) commands, but what has it do with *batch* conversion? Where’s the batch? 😉
I have created a shell script that makes the process of batch image conversion.
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Well it is batch if you just place an asterisk as input file. All the extracted files will have the format as the output filename plus a number. So for example:
convert -quality 70% * foto.jpg
will produce a number of fotos:
foto-0.jpg, foto-1.jpg etc