XnShell creates LZW with increased filesize

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Peter2
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XnShell creates LZW with increased filesize

Post by Peter2 » Fri Feb 08, 2013 1:04 pm

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
XnView 2.48 German, Win 7 x64 Prof. / Win 10

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Re: XnShell creates LZW with increased filesize

Post by eL_PuSHeR » Sat Feb 09, 2013 11:25 am

I guess it's a truecolour bitmap. Try using LZW+Predictor or ZIP (deflate) compression instead.
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Peter2
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Posts: 1151
Joined: Thu Nov 24, 2005 3:07 pm
Location: CH

Re: XnShell creates LZW with increased filesize

Post by Peter2 » Sat Feb 09, 2013 11:43 am

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
XnView 2.48 German, Win 7 x64 Prof. / Win 10

eL_PuSHeR
Posts: 267
Joined: Sat Apr 25, 2009 9:23 am

Re: XnShell creates LZW with increased filesize

Post by eL_PuSHeR » Sun Feb 10, 2013 8:40 am

You are welcome.
Intel i7 5960X
Gigabye GA-X99-Gaming 5
8 GB DDR4 (2100)
GeForce GTX 970 (Gigabyte)

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