Mounting an Image Class Collection

From DLXS Documentation

Main Page > Mounting Collections: Class-specific Steps > Mounting an Image Class Collection

See Image Class in Action

See Getting Started with DLXS and Installing DLXS for information on Image Class and installing a sample image class collection.

Read the Image Class workshop tutorial for a useful introduction to working with Image Class.

Migration	Migration to DLXS13
Media	Loading Image Files Image Class and JPEG2000
Metadata	Image Class Data Loading: MySQL Media Table
Advanced	Mapping Image Structures
General	Not To Be Missed Image File Naming Data Requirements Access Control
Interface	Dynamic Browse User Interface Collmgr/Collection Database

Not To Be Missed

Worth Noting

• MySQL, by default, indexes words 4 characters or longer. Shorter words are therefore not searchable. This can be changed if desired. It requires having the following configuration directive in the [mysqld] section of the MySQL configuration file (usually /etc/my.cnf):
  
  ft_min_word_len=2
  
  Once this is done, existing fulltext indexes will need to be rebuilt. The following command does the job nicely in MySQL.
  
  REPAIR TABLE tbl_name QUICK
  




• There are other situations where you might need to repair tables or rebuild indexes. Migration of tables from one version of MySQL to another can be such a case. Signs of trouble may be subtle. Boolean searching has been known to fail quietly. In addition to the REPAIR command above, you can try...
  
  REPAIR TABLE tbl_name USE_FRM
  
  Thanks to Aaron Brenner for the tip and this link <a href="http://dev.mysql.com/doc/mysql/en/Fulltext_Fine-tuning.html">http://dev.mysql.com/doc/mysql/en/Fulltext_Fine-tuning.html</a>.

Easily Overlooked

• The amount of time it takes for thumbnail images to display in the browser can be reduced dramatically by creating a symlink for each collection like this....
  cd $DLXSROOT/web/c/coll
ln -s $DLXSROOT/img/c/coll/index thumb
  
  The only drawback to this approach is that it bypasses the cgi and authentication for thumbnails by essentially putting them under the web document root. If thumbnail security is important, don't create the symlink.

A Common Problem

• If you get a division by zero error from the Image Class CGI when trying to view a full size image, double check the installation of mrsid_retrieve. Most likeley, it is not installed properly.