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Date Posted: 11:25:20 06/03/02 Mon
Author: Paul
Subject: Re: Unknown Compression Format (Tiff)
In reply to: Paul 's message, "Unknown Compression Format (Tiff)" on 05:57:04 06/03/02 Mon

Some more facts...

It seems that the assignment does not work as it should:

TTiffGraphic(IMSB.Graphic).Compression := tcGroup4;

When I debug the value it's tcNone before as well as after the assignment. However, if use the debugger and set the compression to tcGroup4 while debugging(before the assignment takes place), the value actually changes.

This information maybe helps you to solve the problem.


>Hi Michel!
>A short question about a specific compression type. I
>have an black-and-white image, compressed with the
>"CCITT Group 3(1d) Mod.Huffman" or short "Huffman RLE,
>1200 DPI". When I load the image into the
>imagescrollbox and test it with the
>TiffCompressionStr()-function the result is tcNone.
>Afterwards I do some manipulation(change som pixels)
>and try to save the file. Then on the BeforeSave Event
>I test again:
>if Graphic.ImageFormat = ifBlackWhite
>...TTiffGraphic(Graphic).Compression := tcGroup4
>But the compression type remains tcNone.
>Any suggestions?

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  • Re: Unknown Compression Format (Tiff) -- Michel, 21:25:47 06/03/02 Mon
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