ImageGear for C and C++ on Linux v20.0 - Updated
[No Target Defined] > File Formats and Compressions > File Formats > File Formats Reference > RAS

Full Name RAS (Sun Raster Data Format)
Format ID IG_FORMAT_RAS = 37
File Extension(s) *.ras
Data Type Raster Image
Data Encoding Binary
Color Profile Support No
Multi-Page Support No
Alpha Channel Support No

ImageGear Supported Versions:


ImageGear Supported Features:

ImageGear Read Support:

ImageGear Write Support:

ImageGear Filter Control Parameters:

Filter Control Parameter Type Default Value Available Values Description
SAVE_COMPRESSED INT 0 (FALSE) TRUE, FALSE Compression flag. If TRUE the saving image will be RLE compressed.


Bitmap images used under the SunOS system and UNIX imaging applications are usually stored in Sun Raster form.

The Sun Raster header contains image data (size and type), and the type and size of the colormap, if present. It also contains a Sun Raster identifying tag called "MagicNumber," which always contains the same value. A type field identifies the version of Sun Raster, the most common are called "Old" and "Standard". These are actually the same format and indicate that the image is not compressed. Other possible versions of Sun Raster files include TIFF and IFF, meaning that the image data was converted from one of these formats.

Following the header is a colormap, if applicable. Most 24 or 32-bit raster images do not use a colormap, but rather store the color values directly with the image data. This is known as "truecolor".

The last element of the Sun Raster file is the image data itself. It is usually in 2D raster format.

References Used:

Brown, C. Wayne, and Barry J. Shepherd. Graphics File Formats: Reference and Guide. Greenwich, CT.: Manning Publications, 1992.

Kay, David C. and John R. Levine. Graphics File Formats. Windcrest Books, 1992.

Murray, James D. and William vanRyper. Encyclopedia of Graphics File Formats. Sebastopol, CA: O'Reilly & Associates, Inc., 1994.

Is this page helpful?
Yes No
Thanks for your feedback.