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Date Posted: 12:17:12 07/26/00 Wed
Author: Chris Swinney
Subject: Re: Envision Library Oddities (but new user as well!)
In reply to: Michel 's message, "Re: Envision Library Oddities (but new user as well!)" on 07:13:35 07/24/00 Mon

Thanks for the response, Sorry now for my delay, I thought I post once a few days ago bu tit assn't appeared. Comments below.

> Dear Chris,
> I apologies for the delay. I have been on vacation and
> was planning to continue working on Envision, but I took > the time off instead.
everyone needs a break!

> Most scanners will return ifColor256
> with gray scale images. A gray scale image is really a
> color image, where the palette
> entries have the same R, G, and B values. The only way
> to know for sure is to look at the
> palette.
The 256 colour/grey pallet pixel as I understand it is made up of an 8 bit number split into RGB (3/3/2). I'm not sure of the relationships between the bits to determine whether the pallet is grey or not. Anyway, I assume you would need to test every pixel useing scanline or some such, Would this take to long or would it just be simpler to make a note the what pallet the user asked for and covert it just after the scan and just before the stream write?

> For reading the TIFF file with JPEG compression, I'm
> not sure what the error you are
> receiving is. The first possibility is that the
> exception is raised internally and handle by
> the library itself. Does the TIFF file load properly
> with the compiled Demo.EXE program?
> Best regards,
> Michel
No, the demo desn't work either. Take a tiff image in Windows Imaging or such, and change the properties of a page to 256 gray or ture colour, then use JPEG compression and save it. Now try to open the document in the demo and you should recieve the "compression tag 6 not supported error". This si an internal error but I am away from the development machine at the mo so cant say exactly where.

Thanks for any further insight.


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