uncompressed grayscale TIFF to LZW?

[Dave Smey]

Does anybody know of a command-line or otherwise quick way to convert huge
uncompressed grayscale TIFF's to TIFFs with LZW compression?

Sadly, IrfanView converts it to 8-bit indexed color in the process,
apparently distorting my gray values.

I've also wasted quite a bit of time with Lead Technologies Command-Line
Converter

http://www.leadtools.com/Utilities/Cmd-Line/File-Converter/default.htm

but can't get it to do anything, for some reason.

At this point I seem to be SOL - I'll end up doing a bunch of clicks in
Photoshop LE.

-Dave Smey

 

[Mike Dee]

Does anybody know of a command-line or otherwise quick way to
convert huge uncompressed grayscale TIFF's to TIFFs with LZW
compression?

The Gimp has a batch command, but for CLI you might want to take a look
at ImageMagick.
<http://www.imagemagick.org/script/index.php>

And Sam2p, who's author claims, is better at LZW conversion than
ImageMagick (there may be some truth in this).
Scroll down page to DL Windows binaries
<http://www.inf.bme.hu/~pts/sam2p/>

 

[Dave Smey]

The Gimp has a batch command, but for CLI you might want to take a look
at ImageMagick.
<http://www.imagemagick.org/script/index.php>

Yes, it works! At least for smaller files. On my hugest one (81MB) it
either took a really long time or hung - I'll have to systematically work my
way up in size to see what the deal is.

And Sam2p, who's author claims, is better at LZW conversion than
ImageMagick (there may be some truth in this).
Scroll down page to DL Windows binaries
<http://www.inf.bme.hu/~pts/sam2p/>

Yeah, Sam2p did the same thing Irfanview did, converting the grayscale to
8-bit indexed color. Surprising, given the way the author talks up his
work.

Thanks so much for your help.

-Dave Smey
(music theory freeware at davesmey.com)

 

[Andrei]

You can use the command line interface to the PEERNET File Convesion
Center to batch convert your grayscale TIFFs to TIFF LZW and preserve
the gray values (specify Custom Use - Optimize in the job properties)

http://www.peernet.com/fcc/index.html

Regards,
Andrei

 

[Dave Smey]

You can use the command line interface to the PEERNET File Convesion
Center to batch convert your grayscale TIFFs to TIFF LZW and preserve
the gray values (specify Custom Use - Optimize in the job properties)

http://www.peernet.com/fcc/index.html

Regards,
Andrei

Appears to be trialware, actual price is $140?