About the image output parameters
Aimsms.cfg specifies default Spatial Server settings for Image Server and is located at:
Windows: <ArcGIS Installation Directory>\ArcIMS\Server\etc
UNIX and Linux: $AIMSHOME/etc
The following settings can be changed:
- <SERVERCOMPONENT connectionsharing="1">
The number of pooled ArcIMS Server instances connecting to one ArcSDE connection. For more information see Setting connection parameters for ArcSDE. Recommended value is 1.
- <PARAMETER name="jpegquality" value="85" />
Percentage representing the quality of jpeg images. The default value is 85%. For more information, see Changing image output parameters.
- <PARAMETER name="pngcompression" value="-1" />
Compression value for png8 and png24 images. Values can range from -1 to 9. The default value is -1 and is equivalent to a compression value of 6. For more information, see Changing image output parameters.
- <PARAMETER name="interlacedgif" value="true" />
When using GIF output, you can specify whether the image first appears in a pixilated form before the higher resolution image is displayed. The default value is True. For more information, see Changing image output parameters.
- <PARAMETER name="imagefeaturelimit" value="-1" />
Maximum number of features that can be returned from a GET_FEATURES request. The default value is -1, which indicates no upper limit. For more information, see Strategies for using feature limits.
- <PARAMETER name="fontdirectory" value="" />
Directory indicating additional font locations. Multiple directories can be listed. On Windows, separate the directories with a semicolon. On UNIX and Linux, use a colon. For more information, see Locating and pointing to font directories.
After making any changes to this file, you must restart ArcIMS Monitor and ArcIMS Application Server.
Search code: @ref_aimsms 
About the image output parameters
You can change some settings for image output and display for images generated from an Image Service. Depending on the type of data you have, along with requirements for quality, you may want to change some Spatial Server parameters. Because each site is unique, an image setting that performs well for one site may not work as well for another site.
Changing JPEG quality
The parameter jpegquality can be modified to change the quality of the JPEG output. The value represents a percentage value from 0 to 100, where 0 is the lowest quality and 100 is the best (default is 85 percent). The higher the value, the longer it takes to generate the image. This value does not signify the amount of compression.
The following table shows output file size and output generation time based on the JPEG quality setting. The output generation time is available in the Image Server log files. This benchmark is based on an image 800 x 600 with six vector layers. The file size and output time should be considered relative to each other since results will vary depending on the size and type of data used in a map.
| jpegquality | Image size (kb) | Output time (sec) |
|---|---|---|
| 50 | 146 | 0.047 |
| 60 | 164 | 0.047 |
| 70 | 189 | 0.047 |
| 85 (default) | 256 | 0.062 |
| 90 | 304 | 0.078 |
| 100 | 668 | 0.078 |
Changing the PNG compression
The parameter pngcompression is a compression value from 0 to 9, where 0 indicates no compression and 9 indicates the highest compression. The higher the compression, the longer it takes to generate an image. The default value of -1 is equivalent to a compression value of 6.
The following table shows output file size and output generation time based on the PNG compression setting. This benchmark is based on the same 800 x 600 image with six vector layers used for the JPEG benchmark. The file size and output time should be considered relative to each other.
| pngcompression | PNG8 Image size (kb) | PNG8 Output time (sec) | PNG24 Image size (kb) | PNG24 Output time (sec) |
|---|---|---|---|---|
| 0 | 471 | 0.047 | 1410 | 0.109 |
| 1 | 70 | 0.032 | 110 | 0.109 |
| 2 | 63 | 0.047 | 100 | 0.109 |
| 3 | 56 | 0.063 | 88 | 0.137 |
| 4 | 54 | 0.062 | 80 | 0.141 |
| 5 | 48 | 0.062 | 74 | 0.156 |
| 6, -1 (default) | 45 | 0.094 | 67 | 0.203 |
| 7 | 44 | 0.140 | 67 | 0.219 |
| 8 | 41 | 0.359 | 66 | 0.453 |
| 9 | 41 | 0.766 | 63 | 1.22 |
Changing the type of GIF output
The parameter interlacedgif specifies whether the images are interlaced or non-interlaced. An interlaced GIF first appears in a pixilated form before the higher resolution image is displayed. It provides an early cue to your user that an image is on the way. This setting does not affect performance. The output size and generation time, whether interlaced or not, is entirely dependent on the data source.
True = interlaced (default).
False = no interlacing.
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