TIFF file (*.tif) Export Only

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TIFF format (Tagged Image File Format) is a high resolution format commonly used for saving graphics for importing into desktop publishing applications on the same or on different computer platforms. TIFF images can be saved using a variety of resolution, color, and compression options. As TIFF images can get rather large, choosing appropriate options is important. The TIFF format is for export only.

Resolution

Available resolutions range from 72 (computer monitor) to 1440 dpi (high resolution output). When choosing a resolution, keep in mind that the size of the file increases as the square of the resolution.

Color

You can select from the following color options:

• Monochrome-Forces all objects to black and white.
• RGB Indexed-Stores colors using computer monitor style of color encoding.
• CMYK Planar-Uses printing press style of color encoding. Groups each color type sequentially. This provides better compression. For example: CCCCCCMMMMMMYYYYYYKKKKK rather than CMYKCMYKCMYKCMYK. This option produces far better compression than using the PackBits compression method. However, many desktop publishing packages do not support CMYK Planar files.
• CMYK Contiguous-Uses printing press style of color encoding. Stores colors non-sequentially. For example: CMYKCMYK. The PackBits compression type provides no compression for this type of file.

NOTE: If objects in your document are black and white they are saved black and white regardless of which Color options you set. If you import drawings from other applications and want them to print Black and White you must set the Color option to Monochrome.

Compression

You can select from the following compression options:

• PackBits-Used to reduce files size by encoding repeating bytes of information as output when using the CMYK Planar color option. Below is a highly simplified representation of this compression scheme. For a line of color information such as: CCCCCMMMMMYYYYYKKKKK, the compression yields a smaller file by representing the information as C46M5Y5K.
• CCITT Group 3-Used for fax transmissions of images.
• CCITT Group 4-Used for fax transmissions of images.
• Deflate-Similar to LZW compression. Works well with all Color and Resolution options.

Setting TIFF options

To set these options:

• Click the Options button in the Save dialog box to display the TIFF options dialog box.

3. Select the options you want and click OK.

NOTE: In the Macintosh version you may want to increase the memory allocated to ChemDraw if you are saving large TIFF files.