2012

Table Of Contents
Quick Reference
Commands
EXTERNALREFERENCES
Opens the External References palette.
PROPERTIES
Controls properties of existing objects.
Improve the Display Speed of Raster Images
To increase the display speed of images, you can change image display quality,
hide images not currently needed, use image tiling, or suppress image selection
highlighting.
To increase the display speed of images, you can change image display quality
from the default high quality to draft quality. Draft-quality images appear
more grainy (depending on the image file type), but they are displayed more
quickly than high-quality images. Use the IMAGEQUALITY system variable
to control image quality.
You can improve the image quality when using True Color (24 or 32 bits per
pixel) for raster images by selecting or clearing certain options on the Display
tab in the Options dialog box. When images are displayed at optimum quality,
regeneration time increases significantly. To improve performance, decrease
the number of colors for the system display setting while working in a drawing.
You can increase redrawing speed by hiding images you do not need in the
current drawing session. Hidden images are not displayed or plotted; only the
drawing boundary is displayed. You can choose to hide an image regardless
of the user coordinate system (UCS) in the current viewport.
Use Tiled Images
Tiled images are small portions (a series of tiles) of large images that load much
faster than non-tiled images. If you edit or change any properties of an image,
only the modified portion is regenerated, thus improving the regeneration
time. TIFF (Tagged Image File Format) is the only tiled format that the program
supports. The TIFF reader supports all image types:
Bitonal (1 bit per pixel)
Gray scale and indexed color (8 bits per pixel)
1936 | Chapter 37 Work with Data in Other Formats