Autotek autocad raster design 2010 用户手册

Depending on what type of image you are exporting, you can choose from
among some of the following correlation output file types:

■

Bitonal Images. Use to creates resource files compatible with Raster Design
ESP version 7 (or higher).

■

Color or Grayscale Images. Use to creates resource files compatible with
Raster Design 7.5 (or higher). You can save the correlation data externally,
rather than in the drawing, so that you can use the same correlation data
in another drawing.

■

World File. Use if you need to transfer the image to another program that
can use a 

 (page 400), such as a mapping program. You can use the

iworldout command to export a world file without exporting the associated
image.

■

Resource File. Use to share images with other Raster Design users, or for
inserting the image into another drawing. A resource file has a .RES
extension. You can create resource files for all image types.

■

Image File. Use with file types that can store correlation information within
the image file. Image File is also a correlation output type option when
you are saving an RLC image.

■

GeoTIFF. Use with TIFF files to store correlation information within the
image file.

NOTE Both Resource files and World files are saved to the path specified in the
Raster Design Options dialog box. If no correlation search path is designated,
Raster Design uses the folder where the image file is stored. For more information,
see 

 (page 247).

When you export certain file formats, such as TIFF, you are prompted for the
encoding and data organization methods you want to use. If you are uncertain
about which method to choose, then accept the default, which reflects how
the image was saved previously.

NOTE AutoCAD works best with certain image types. To optimize performance,
export or save your images in tiled compressed TIFF format whenever possible.

54 | Chapter 3   Saving Images