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XnShell creates LZW with increased filesize

Posted: Fri Feb 08, 2013 1:04 pm
by Peter2
I have a TIF, 300x300 dpi, approx. 18.000 x 13.000 pixel, 680 MB, NO compression.

Then I coverted it with XnShell to TIF, LZW. The result:
TIF, 300x300 dpi, approx. 18.000 x 13.000 pixel, 740 MB, LZW compression.

Bug or feature?

Regards

Peter

Re: XnShell creates LZW with increased filesize

Posted: Sat Feb 09, 2013 11:25 am
by eL_PuSHeR
I guess it's a truecolour bitmap. Try using LZW+Predictor or ZIP (deflate) compression instead.

Re: XnShell creates LZW with increased filesize

Posted: Sat Feb 09, 2013 11:43 am
by Peter2
eL_PuSHeR wrote:I guess it's a truecolour bitmap. ...
I think so - 24 bit.
eL_PuSHeR wrote:...Try using LZW+Predictor ....
-> 672 MB
eL_PuSHeR wrote:...Try using ... ZIP (deflate) compression instead.
-> 606 MB

Thank you.

Peter

Re: XnShell creates LZW with increased filesize

Posted: Sun Feb 10, 2013 8:40 am
by eL_PuSHeR
You are welcome.