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Date Posted: 07:43:17 07/18/00 Tue
Author: Chris Swinney
Subject: Envision Library Oddities (but new user as well!)


I'm just putting together a simple archiving application using your Envison Library. I have come accross a few problems (I think) that I am unsure of how to solve.

Firstly, when running the application (or demo) in the compiler and scanning, an External Exception error C0000008 is created when calling the CallTriplet function within the finnaly section of the TScanner.Acquire procedure. Everything seems fine when running the exe so I'm not sure how much of a problem this is, but I can't test multiple scans then in the compiler. This happens under NT and 2000, but haven't checked 98 (using HP ScanJet 5200C).

Secondally, after a little bit of fiddling I managed to get the Scanned image to return a ifGray256 image as requested, by changing the Look up value in the GetImageFormat Procedure. Is there a better way of checking the exact pallet to determine whether a scanned image is GrayScale or Colour?

Thirdly, after returning the Gray scale image, I can compress using tcJPEG, and if the image is multipage then write to a Tiff file using Jpeg compression. However, in the demo when trying to read a tiff file that uses JPEG compression, I recieve the error "Unsupported compression tag 6". I even manage to fool the thing into recogising this tag as Jpeg, but it falls of later on. At this point I gave up. The written file is fine, however, and can be read by other programs like Windows Imaging.

Sorry if this goes on a bit, but I try to give you the fullest picture. Otherwise, this has been an invaluable purchase and I hope that the package keeps getting better.

Once Again,



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