LZW commpression not applied to TIFF
Moderators: XnTriq, helmut, xnview
LZW commpression not applied to TIFF
XnView 1.95.4.
When saving a TIFF, LZW compression is not used in "SaveAs" or "Export" even if it's ticked. I tested the same image in FastStone and it did work and the TIFF was about 25% smaller.
Dan.
When saving a TIFF, LZW compression is not used in "SaveAs" or "Export" even if it's ticked. I tested the same image in FastStone and it did work and the TIFF was about 25% smaller.
Dan.
no compression
Hi dosdan,
just to confirm but
[quote="dosdan"]The file info indates that no compression was used, /quote]
a bit different with me:
- file lzw compressed (by different software): 20.4 Mb
open that file and saved as by xnview lzw checked on: filesize 28.2 Mb, xnview shows image properties - compression : lzw
-
opening an uncompressed tiff by xnview and saved as compressed: nearly no differene in filesize but compression indicator shows lzw.
horst
just to confirm but
[quote="dosdan"]The file info indates that no compression was used, /quote]
a bit different with me:
- file lzw compressed (by different software): 20.4 Mb
open that file and saved as by xnview lzw checked on: filesize 28.2 Mb, xnview shows image properties - compression : lzw
-
opening an uncompressed tiff by xnview and saved as compressed: nearly no differene in filesize but compression indicator shows lzw.
horst
Re: no compression
Take the same uncompressed TIFF & save it as a LZW-compressed TIFF in another freeware package such as as FastStone, ans see how much it drops.siepict wrote:opening an uncompressed tiff by xnview and saved as compressed: nearly no differene in filesize but compression indicator shows lzw.
horst
The compressability of a TIFF will depend on the content. Here are some test sizes on a 1500x1000 TIFF file using "true" KB (1,024 bytes). Actual filesize is 4,508,248 bytes. The slightly greater size then the calculated 4,500,000 bytes is due to the overhead of the TIFF file header.
Code: Select all
TIF 4,403KB 100%
TIF/LZW 3,120KB 71%
JPG 100% 1,190KB 27%
JPG 95% 617KB 14%
JPG 90% 435KB 10%
JPG 80% 297KB 7%
JPG 70% 237KB 5%
<Moderator's note: Double post has been deleted.>.
Re: LZW commpression not applied to TIFF
Could you send me a sample used to convert in LZW TIFF?
Pierre.
Re: LZW commpression not applied to TIFF
Pierre,
sure, but I will try to create a file a bit smaller then my 30 Mb files .
Which e-mail adress ( <removed> ? )
horst
<Moderator's note: Mail address has been removed - please see Rules and Guidelines>
sure, but I will try to create a file a bit smaller then my 30 Mb files .
Which e-mail adress ( <removed> ? )
horst
<Moderator's note: Mail address has been removed - please see Rules and Guidelines>
Re: LZW commpression not applied to TIFF
How to contact the authorsiepict wrote:Which e-mail adress ( <removed> ? )
Dreamer
Re: LZW commpression not applied to TIFF
Ok, you can try LZW+Predict, and the result is smallersiepict wrote:Pierre,
sure, but I will try to create a file a bit smaller then my 30 Mb files .
Which e-mail adress ( <removed> ? )
horst
Pierre.
confirmation?
Pierre, have you got my PM? horst
edit: I've just tried 'predict' option, and must confess, that works fine.
I've never read about that, always and only 'LZW', that was the reason, why I haven't tried.
Maybe a litle hint in the space of that dialog box will help to select the 'correct' compression mode?
horst
edit: I've just tried 'predict' option, and must confess, that works fine.
I've never read about that, always and only 'LZW', that was the reason, why I haven't tried.
Maybe a litle hint in the space of that dialog box will help to select the 'correct' compression mode?
horst