The following options are available when you choose Optimized Original Images or Optimized Formatted Images in the Images tab of the Export XML dialog box.

Image Conversion

Specifies which file format to use for the converted image. If you choose Automatic, InDesign chooses the best file type based on the image. Hence, you may want to specify both GIF Options and JPEG Options.

GIF Options

Specify the formatting for images that are converted to GIF format when exported to XML. You can set the following options:

Palette

Specifies the color palette you want the image to conform to when converted. Choose the palette for the final display format of the XML content. Adaptive (no dither) works well for images with primarily solid colors and can be used when the final output will be to multiple formats.

Interlace

Downloads every other line of the image with each pass, instead of downloading the entire image in one pass. Interlacing enables a preview of the image to download quickly, as each successive pass adds resolution until the final quality is met.

JPEG Options

Specify the formatting for images that are converted to JPEG format when exported to XML. You can set the following options:

Image Quality

Specifies the quality of the converted image. The higher the quality setting, the larger the file size and the longer it takes to download.

Format Method

Specifies how the JPEG image is formatted for download. Baseline downloads the final quality image in one pass, so that the file displays at its final quality as soon as it opens; this format may take longer to download than a Progressive formatted image. Progressive downloads the image in a series of passes, with the first pass a low-resolution version and each successive pass adding resolution to the image until the final quality is attained.