This section tells about transforming user-selected images before upload. ActiveX/Java Uploader can resize, recompress, rotate, crop and watermark images on a client side. These transformations may be combined, for example, an image can be resized and watermarked at the same time. You can create any number of transformed versions of one image, for instance, the first one is a considerably downsized version, the second is watermarked, and the third is cropped and watermarked. An image you get after applying any set of transformations is called thumbnail.
To configure a thumbnail you should add a Converter to the Uploader.Converters collection and set its Mode property to Thumbnail. For more information about converters, please, see the Configuring Files to be Uploaded in ActiveX/Java Uploader topic.
Each thumbnail is a file, so on the server you can save uploaded thumbnails using any approach examined in the saving uploaded files topic.
Now, when you have an idea about what thumbnail means in terms of ActiveX/Java Uploader, how to configure converters, and how to save uploaded files, let us briefly describe each topic of this section:
ActiveX/Java Uploader can load a lot of image formats and display previews for them, however, it can save the image only into the single format - JPEG. So, all thumbnails created by ActiveX/Java Uploader are JPEG images.