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Date Posted: 14:11:33 07/22/03 Tue
Author: Mike Haiss
Subject: Re: Corrupt Tiffs
In reply to: Michel 's message, "Re: Corrupt Tiffs" on 20:24:19 07/21/03 Mon

Actually they are group4 compression and I loaded them with the TTiffGraphic and no exception is thrown. Hence my dilema. I've compared all the tags between the good and corrupt images and have found no difference. Any ideas?
>
>Hi Mike,
>
>This is most likely tiff files with JPEG compression.
>Envision uses the revised Tiff 6 specification, and
>windows imaging does not. You should find more info on
>this on www.libtiff.org.
>
>It goes both ways, tiff (with jpeg compression) saved
>with Envision will not load in imaging for windows and
>vice versa.
>
>To detect those files, just try to load them with a
>TTiffGraphic. If there is an exception, it is windows
>imaging files, and if it loaded properly and the
>TiffGraphic.Compression = tcJPEG, then it is the
>revised jpg compression.
>
>Best regards,
>
>Michel
>
>>I am having a problem with corrupt Tiffs that will not
>>load in Windows imaging. My problem is that I want
>>to write a program in CB6 to find the corrupt images
>>and list them. However the envision package will open
>>them. Is there any tag (or anything) I can access in
>>code that will tell me when the image is corrupt? In
>>the envision package the corrupt area of the images
>>has black lines and black blocks over it when it is
>>displayed.
>>Any help would be appreciated...

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