Document Express Enterprise includes several profiles that are customized for color images. Encode these images using the documenttodjvu command.
Like bitonal profiles, each type of color profile includes several dpi options: 600, 500, 400, 300, 200, 150, and 100. An example of a color profile is scan300. Choose a color profile that is appropriate for the type of image you are encoding. The profile dpi should match or be slightly less than the dpi of the source image. A lower dpi may increase the quality of the resulting DjVu document. (The size of the DjVu file may also increase, however.)
Document Express Enterprise provides four types of color
profiles:
Profile |
Description |
Scan |
For images that contain text with a consistent weight and color. The image may also contain inverted text (for example, white text on a black background or light blue text on a dark green background) and pictures or photographs. Examples include catalogs, brochures, annual reports, and tax forms. Scan300 is the default profile for the documenttodjvu command. |
Draw |
For images that contain text with a slightly inconsistent weight and color and shapes that are not exactly reproduced. Text should not be inverted. Examples include drawings, sketches, and handwritten letters. |
Manuscript |
For images that contain text with a very inconsistent weight and color that may be faded in places. This profile is also designed to maintain the visual quality and texture of the paper of the scanned document. Examples include historical documents (Renaissance texts, early prints, etc.), handwritten letters, and other documents written upon parchment paper or a variably colored background. |
Clean |
For images that are electronically generated and have not been filtered or anti-aliased. Because they were not scanned, these images do not contain any noise. Examples include screenshots, Web images with text, clip art with text, and slides. NOTE: The clean profile is not optimized to work with characters that have been rendered too thin. In these instances, use a scan profile instead to improve the quality of the text. |