Choose Always Create Output Folder . This makes your life easier. If your thumbnails are stored in multiple sub-folders, choose Read Files in Subfolders , and Duplicate Source Tree For Input . This will cause ThumbNailer to process files in subfolders of your source folder and to create corresponding subfolders in your destination folder. Clear Destination Folder is always a good choice, too, since you will probably be making changes as you go.
Few browsers support any other formats.
Image Enhancement Check Background Matte . For the background matte color, choose the same color that you will use for your HTML pages. This will insure that your thumbnails are all the same size, giving the thumbnail tables a more uniform appearance. HTML Output Check Create HTML Files. If you stop here, you will get a very basic set of HTML pages.