XnShell creates LZW with increased filesize

Moderators: XnTriq, helmut, xnview

Post Reply
User avatar
Peter2
XnThusiast
Posts: 1328
Joined: Thu Nov 24, 2005 3:07 pm
Location: CH

XnShell creates LZW with increased filesize

Post 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
XnViewMP 1.6.5 German, XnConvert 1.99, 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 »

I guess it's a truecolour bitmap. Try using LZW+Predictor or ZIP (deflate) compression instead.
Intel i7 5960X
Gigabye GA-X99-Gaming 5
8 GB DDR4 (2100)
GeForce GTX 970 (Gigabyte)
User avatar
Peter2
XnThusiast
Posts: 1328
Joined: Thu Nov 24, 2005 3:07 pm
Location: CH

Re: XnShell creates LZW with increased filesize

Post 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
XnViewMP 1.6.5 German, XnConvert 1.99, 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 »

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