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In order to prevent memory issues it is important that you resize your pictures to a maximum size of 1000 x 1000 pixels before posting them. This is the best compromise between file size and quality. There are many ways to do so. In this little tut I'll be showing you some of them.
Single pictures can be resized by loading them into one of the many free or commercial graphic programs such as Gimp, Paint.NET or Photoshop. If you wish to resize many pictures a program with a batch-resize function will be handy.