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Re: TIFF and GIF LZW Compression for 14.5
Started by MikelFinch at 11-15-2007 14:16. Topic has 1 replies.

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  11-15-2007, 14:16
MikelFinch is not online. Last active: 11/15/2007 7:00:04 PM MikelFinch

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TIFF and GIF LZW Compression for 14.5
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I have just migrated to LeadTools v14.5 and I previously used LeadTools 12.1.  In our application we need to have support for GIF and TIFF images that contain LZW compression.  Some of the code is in VB6, which would make a call to 'UnlockSupport' to enable this feature.

While updating the code I changed the key values mentioned in: http://support.leadtools.com/SupportPortal/desktopmodules/viewarticle.aspx?aid=75FAQ

and the code worked fine.  Just for fun I decided to comment out the calls to UnlockSupport and the code still works fine.  And to answer the simple questions:
1.) Yes, I am using LZW compressed TIFF and GIF files to test with
2.) There are no extra lines at the bottom of my ltocx14.lic to unlock support for LZW compression
3.) Commenting out the UnlockSupport lines in the v12.1 code will result in an error mentioning something like "file format locked".

So my question is: "Do we no longer need to call UnlockSupport for LZW Compressed TIFF and GIF files in LeadTools 14.5?"  Or was this just a fluke?

Regards,
Mikel Finch


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  11-16-2007, 16:06
jigar is not online. Last active: 7/24/2008 12:12:53 PM jigar



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Joined on 08-22-2007
Posts 371
Re: TIFF and GIF LZW Compression for 14.5
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Hello Mikel,

The patent for LZW compression expired after the v14 release.  So we no longer needed customers to sign any licensing terms, and no need for locking the feature.  In v12 you will still need to use the unlock code, because v12 isn't maintained anymore and it was built way before the patent for LZW expired.  In v14.5 there's no need for it, because the patent has expired, and anyone is free to use the LZW compression.  That should clear things up for you.  Let me know if you have any more questions.

Thanks.

LEADTOOLS Technical Support
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