Width. The width, in pixels, of each thumbnail. Larger thumbnails require more disk space for you and more download time for users. The default is 96 pixels, which is the same as the default ThumbsPlus thumbnail size.
Height. The height, in pixels, of each thumbnail. Larger thumbnails require more disk space for you and more download time for users. The default is 72 pixels, which is the same as the default ThumbsPlus thumbnail size.
GIF/JPEG. Select the format for the thumbnails. Generally, JPEG works best for photographic images, and GIF for line-drawn. You may wish to experiment with your particular graphics.
Jpeg Quality (JPEG thumbnails only). The quality level for JPEG thumbnails. This option is available only if you select JPEG thumbnails. Because thumbnails are small, you can usually get away with a fairly low quality of 60 or so.
Include Low-res GIFs (JPEG thumbnails only). When you select JPEG thumbnails, ThumbsPlus can also generate low-resolution black and white GIF images. Some browsers will load these first, giving the overall appearance of the page, then load the full-resolution JPEG images.
GIF Netscape palette (GIF thumbnails only). This option causes Thumbsplus to save the GIF thumbnails with a netscape compatible palette. This option is available only if you select GIF thumbnails.
Photo borders. Adds a white border (like the edge of photographs) around the thumbnails.
Use original files if smaller than thumbnail size. When the original file is smaller than the thumbnail size (above), ThumbsPlus will use the original rather than make a separate file for the thumbnail. However, if you choose 'Custom URLs/Folders' below, ThumbsPlus will still make a copy of the file in the thumbnail folder.