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Date Posted: 06:53:56 07/23/03 Wed
Author: Mike
Subject: Re: Corrupt Tiffs
In reply to: Mike Haiss 's message, "Re: Corrupt Tiffs" on 14:11:33 07/22/03 Tue

Hi Mike,

No, I don't have many ideas to detect if a group4 file will not load in Imaging for Windows. One thing I would check is trace in the debugger the loading in EnTifGr.Pas. One common cause of error I have found with some tiff files, is that they are missing a few tiff tags and assume default values. You will see any missing tags will tracing the source code. I am not sure this is the problem but it is worth a try.

Best regards,


>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,
>>>I am having a problem with corrupt Tiffs that will
>>>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
>>>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
>>>Any help would be appreciated...

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