I have several thousand thumbnails to process. They range in size from 100 to 400 pix wide, small file sizes range about 12-20KB. I'm trying to get them all to 150 pix wide. yes, I know, I can control my html output to width='150' but I like consistency in my data. I use Preview to resize thumbnails in batches. While batch processing jpg's works fine: Steps I use are: select jpg files in finder command-O to select all to open in Preview command-A to select all choose Tools/Adjust Size (there really should be a keyboard shortcut for this) enter width option-command-S to save all A nice and easy to use batch processing. Workflows don't batch process based on image width so I use Preview. So that all works fine for jpgs. For gif's, its another story altogether. 1.Batch processing does not work. 2. Selecting a group of gif's and trying to edit image width one by one will result in Preview crashing at some point. Typically within the 2nd or 3rd image. 3. Trying to work on a gif file at a time also results in constant crashes. Starting off a few will be successfull in resizing and saving but its not long before Preview crashes. Only solution is to reboot. And that is only temporary until Preview starts crashing again. Ideas anybody?