Raster Images in Drawings
Raster images consist of a rectangular grid of small squares or dots known as pixels.
For example, a photograph of a house is made up of a series of pixels
colorized to represent the appearance of a house. A raster image
references the pixels in a specific grid.
Raster
images, like many other drawing objects, can be copied, moved, or
clipped. You can modify an image with grip modes, adjust an image for
contrast, clip the image with a rectangle or polygon, or use an image as
a cutting edge for a trim.
The image file formats supported by the program include the most common
formats used in major technical imaging application areas: computer
graphics, document management, engineering, mapping, and geographic
information systems (GIS). Images can be bitonal, 8-bit gray, 8-bit
color, or 24-bit color. Images with 16-bit color depth are not
supported.
Several image file formats support images with transparent pixels. When
image transparency is set to on, the program recognizes those
transparent pixels and allows graphics in the drawing area to “show
through” those pixels. (In bitonal images, background pixels are treated
as transparent.) Transparent images can be gray-scale or color.
Supported Raster Image File Formats
Format | Extension |
---|---|
Adobe Photoshop Format | .psd |
Arc/Info ASCII Grid Format | .asc, .txt |
Arc/Info Binary Grid Format | .adf |
Autodesk Animator | .fli, . flc |
CALS Type | .cal, .mil, .rst, .cg4, .gp4, .cals |
DDS (HDR) Format | .dds |
Digital Terrain Elevation Data | .dt0, .dt1, .dt2 |
ECW Compressed Image Format | .ecw |
FAST-L7A | .fst |
GIS-GeoSPOT | .bil, .bip, .bsq |
Graphics Interchange Format | .gif |
HDR Format | .hdr, .pic |
ILM OpenEXR Format | .exr |
Image Systems CCITT Group 4 | .ig4 |
JPEG File Interchange Format | .jpg, .jpeg |
JPEG2000 | .jp2, .j2k |
Macintosh PICT | .pct, .pict |
MrSid | .sid |
Native Format DOQ | .doq, .nws, .nes, .ses, .sws |
NITF | .ntf |
Portable Network Graphics File | .png |
QuickBird Tagged Image File Format | .tif, .tiff |
RLC | .rlc |
Tagged Image File Format | .tif, .tiff |
Truevision Targa | .tga |
USGS Digital Elevation Model | .dem |
Windows Bitmap | .bmp, .dib, .rle |
ZSoft PC Paintbrush | .pcx |
Note: Although the file name
extension is listed in the previous table, the file format is determined
from the file contents, not from the file extension.
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