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 applying compression to enormous TIF files
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dave.sellers

United Kingdom
17 Posts

Posted - Mar 03 2014 :  10:37:15  Show Profile  Reply
Hi

I have some massive TIF files - up to 50GB in size (yes, you read correctly, Giga bytes).

They are massive because many of the pages are uncompressed. I'm wondering if/how I can either modify these files or create new files from them, applying compression to any uncompressed pages.

Clearly this needs to be done without trying to load the whole file into memory, any suggestions on how best to approach this much appreciated.

Thanks
Dave

xequte

38615 Posts

Posted - Mar 04 2014 :  20:42:30  Show Profile  Reply
Hi Dave

Try loading the TIFFs into a TIEBitmap using:

MyIEBitmap.Location := ieFile;
MyIEBitmap.Read('D:\image.tiff');

Then resample it with:

http://www.imageen.com/help/TIEBitmap.Resample.html

And save (MyIEBitmap.Write)

Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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