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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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For bulk processing of images I have had excellent results with ImageMagick. It's free and open-source, runs on Windows or Linux or OS/X, and delivers good results on all of them.
One of the nice features of it is that you can issue command-line commands (or use them in a script). So, if you have about 11,000 images that you want to "intelligently" .. say, resize to no larger than 640x480 (retaining proportions), and reduce to no more than 256 colors, and convert to a JPEG with a preview and a "Do Not Copy This" over-stamp ... you can do it, basically in one step.
I used it with great success on a recent Windows project, which had just been jack-hammered by the vulnerabilities in GDI+.DLL...