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image-processingasp-classicimage-resizingimage-compression

What are some options for handling image uploading/compression in ASP?

please bear with me as I'm not trying to frustrate anyone with inane questions, and I did google search this but I couldn't really find anything recent or helpful.

I am a novice programmer and I am using a classic asp web application. I just enabled the users to upload and download images, but I'm quickly regretting it as it's eating up all of the router bandwidth. I am finding my solution inadequate, so I wanted to start over.

My desire is threefold with this functionality:

  1. Compression. I understand that this is impossible to do BEFORE uploading without some kind of Java/Silverlight/Flash portion of the application to handle uploads, correct? What is the common way most places go about this? Just allow regular file uploads and compress once they are on the server?

  2. Resizing. I want to resize all images before they are uploaded to a reasonable size, instead of just telling users that try and upload huge camera images that they can't upload. I figure I just want to let them upload and have it resize for them before uploading. Does this functionality exist already?

  3. Changing filetype. I want to allow users to upload all image file types but make them .jpg on the server after the upload.

With these three requirements, how hard is it to implement something like this in just pure code and libraries? Would it be better to just use a 3rd party plugin, such as ASPjpeg or ASPupload? Have you encountered something similar, and what was your solution?

Thanks.

Solution

  • Take a look at ASPJpeg and ASPUpload from Persits. We use these components to upload a full size image (can be png even though the library is "ASPJpeg"), resize it to several different sizes we need on our site, then store the resized images on the server in a variety of folders. The ASPUpload component is a little tricky but if you follow their sample code you'll be fine.

    I never found a good component for decompressing uploaded zip files and had to write my own, which I've since abandoned. In the end with upload speeds increasing and storage getting so cheap, it started to matter less and less that the files were compressed before being uploaded.

    EDIT: Just noticed you mentioned these components in your question. Consider this an endorsement of your idea to use them. :-)