Silicon Graphics Image(SGI) or theRGB file formatis the nativerastergraphics file formatforSilicon Graphicsworkstations.[3]The format was invented byPaul Haeberli.[3]It can berun-length encoded(RLE).FFmpegandImageMagick, among others, support this format.
Silicon Graphics Image
|
Filename extension |
|
|
Internet mediatype |
image/sgi[1] |
|
Type code |
‘.SGI’ |
|
Magic number |
01 DA |
|
Developedby |
Paul Haeberli |
|
Initial release |
0.95 / 1995; 28years ago[2][3] |
|
Latest release |
1.00 |
|
Type of format |
image file |
|
Standard |
SGI Image File Format[4] |
Background
Technical Details
SGI image format usebig endianorder. Image data scan from left to right from bottom to top.
Header
|
Field number |
Hex offset |
Length |
Field name |
Description |
|
1 |
0x00 |
2 byte |
File signature/magic number |
For show file is SGI file |
|
2 |
0x02 |
1 byte |
Compression |
0 = uncompressed, 1 = RLE compressed |
|
3 |
0x03 |
1 byte |
Bytes per pixel |
1 = 8 bit, 2 = 16 bit |
|
4 |
0x04 |
2 bytes |
Dimension |
Image dimension, equal 3 for RGBA image |
|
5 |
0x06 |
2 bytes |
X size |
Image width |
|
6 |
0x08 |
2 bytes |
Y size |
Image height |
|
7 |
0x0A |
2 bytes |
Number of channels |
Number channel in image, equal 4 for RGBA image |
|
8 |
0x0C |
4 bytes |
Minimum pixel value |
Smallest pixel value in image |
|
9 |
0x10 |
4 bytes |
Maximum pixel value |
Largest pixel value in image |
|
10 |
0x14 |
4 bytes |
Reserved |
No use, ignore |
|
11 |
0x18 |
80 bytes |
Image name |
C string name have last byte equal 0x00 |
|
12 |
0x68 |
4 bytes |
Color map ID |
Only for color map image |
|
13 |
0x6C |
404 bytes |
Dummy |
For make head 512 bytes long. Ignore |
File Signature/Magic Number
See also
- SGI服务器托管网 IRIS
References
- ^.sgiMIMEtype notregisteredatIANA
- ^Paul Haeberli(1996).”The SGI Image File Format 0.97″.Silicon Graphics. Retrieved2014-03-07.[dead link]Alt URL
- ^Jump up to:abcJames D. Murray, William van Ryper (April 1996).”SGI Image File Format File Format Summary”.Encyclopedia of Gr服务器托管网aphics File Formats, Second Edition.O’Reilly.ISBN1-56592-161-5. Retrieved2014-03-07.
- ^Paul Haeberli(1996).”The SGI Image File Format 1.00″.Silicon Graphics. Retrieved2014-03-07.
- ^Lars Haglund (Feb 2006).”The SVT High Definition Multi Format Test Set”(PDF).SVT. Retrieved2014-02-23.
- ^“SVT_MultiFormat/2160p50_CgrLevels_Master_SVTdec05”. Video Quality Experts Group (VQEG). 2006. Retrieved2014-03-01.
- ^Marta Mrak, Mislav Grgic, Murat Kunt (2010).High-Quality Visual Experience: Creation, Processing and Interactivity of High-Resolution and High-Dimensional Video Signals. Signals and Communication Technology.Springer. pp.147–154.ISBN978-3-642-12802-8.LCCN2010925849.
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