I need to send the purchased document to the client browser ... in multipage TIFF format with group 4 compression ... but what the client sees when they get the image is not at all correct.

Think out of the box on this one. You're selling them bits, and you need to make sure the bits arrive intact. One reliable way to do this, assuming your clients are on Win32, is to send them .zip files. (There's probably an equivalent reliable interchange format for the Mac.)

So, pre-zip your TIFF files on the server side, and serve up .zip files. This will require that your clients have WinZip (or equivalent) installed, but this is a free download from various places. If you have clients with Macs, ask around for what a reliable download format is.

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