Tiff to GIF conversion

Question

I am using Photoshop library in vb.net and converting the eps, tiff files to GIF.
While saving the tiff file as GIF, i receive an error 'general photoshop error occured. The parameters for command 'Save' are not
currently valid'. Also the GIFoptions like color, dither, forced, matte and transparency properties displays the message 'The property was not
initialized'.
Please let me know what might be the cause of this error.
regards,
Sashi

Answer 1

799847 wrote:
Hey
Sorry but I am quit new to java programming and the "Fire up the execution service in a ContextListener object" is not clear to me!
What I'm suggesting is that you have a queue of (I guess) print requests. I'm assuming you are printing stuff at the server end, not on the client machine. When someone requests a document be printed it adds a request to the queue, and then returns to the user immediately.
A separate process, though still running inside Tomcat, removes these requests one at a time from the queue and processes them (in the order they were submitted). When the queue is empty this process simply waits until an item is added.
You may want to use more that one such process, depends on how resource hungry they are, each taking requests from the same queue. In general you'll find there's an optimal number of these processes (Threads) for best performance, but that optimal number can often turn out to be one. Tends to depend on how good a machine you're running on, how many cores, how much simultaneous IO.
This involves creating the queue and starting the processing thread(s) as the web application starts, and closing them down when it stops. The proper way to do this is to create a class which implements ContextListener and declare it in web.xml. Tomcat will then create an instance of the class and call the appropriate methods on it as the web application is started and stopped.
There are a number of classes specifically designed to handle this kind of queue processing in the java.util.concurrent package. In particular there are two BlockingQueue classes, which is a type of queue that can automatically make a caller wait until there's something in the queue. There are also ThreadPoolExecutors which are designed to manage a group of threads taking jobs off a queue.