Can you zip raw or tiff without loss

Keith wrote:
 > mike regish <mregish.RemoveThis@comcast.net> wrote:
 >
  > > Say I want to send somebody a full res photo. Can I zip compress
either the
  > > RAW image or a tiff with a reasonable decrease in size that will
open
  > > without compression losses?
  > >
  > > mike
 >
 > I recently had a 4mb tiff file that reduced to 1.5mb when saved as a
 > native Photoshop file, the tiff had no compression applied to it.

Is it posible that the tiff was a 48 bit file and then you save as a 24
bit in Photoshop?

Scott<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

A TIFF file is already tight, and using zipping it will have very little, if
any impact on it's size. To answer your question, zipping a TIFF file, then
un-zipping it, will not degrade it. Not sure how all this would apply to
RAW, don't use it, too much work.

Bill Crocker


"mike regish" <mregish DeleteThis @comcast.net> wrote in message
news:0PudncDVGZjnls3fRVn-ig@comcast.com...
 > Say I want to send somebody a full res photo. Can I zip compress either
 > the RAW image or a tiff with a reasonable decrease in size that will open
 > without compression losses?
 >
 > mike
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

zip is lossless compression, if it wasn't it would be useless for most
applications. How much compression you might get on a compressed file is
another issue.
Dave Cohen
"Bill Crocker" <wcrocker007.DeleteThis@comcast.net> wrote in message
news:5ZidnQ41Z8fykM3fRVn-pg@comcast.com...
 >A TIFF file is already tight, and using zipping it will have very little,
 >if any impact on it's size. To answer your question, zipping a TIFF file,
 >then un-zipping it, will not degrade it. Not sure how all this would apply
 >to RAW, don't use it, too much work.
 >
 > Bill Crocker
 >
 >
 > "mike regish" <mregish.DeleteThis@comcast.net> wrote in message
 > news:0PudncDVGZjnls3fRVn-ig@comcast.com...
  >> Say I want to send somebody a full res photo. Can I zip compress either
  >> the RAW image or a tiff with a reasonable decrease in size that will open
  >> without compression losses?
  >>
  >> mike
  >>
  >>
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

"mike regish" <mregish.TakeThisOut@comcast.net> wrote in message
news:0PudncDVGZjnls3fRVn-ig@comcast.com...
 > Say I want to send somebody a full res photo. Can I zip compress either
the
 > RAW image or a tiff with a reasonable decrease in size that will open
 > without compression losses?
 >

If you a program like PKzip to compress the file, it will come out
uncompressed just like the origional. Some files are already compressed
like the ,jpg will not be smaller and could actually be slightly larger.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

mike regish <mregish RemoveThis @comcast.net> wrote:

 > Say I want to send somebody a full res photo. Can I zip compress either the
 > RAW image or a tiff with a reasonable decrease in size that will open
 > without compression losses?
 >
 > mike

I recently had a 4mb tiff file that reduced to 1.5mb when saved as a
native Photoshop file, the tiff had no compression applied to it.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

mike regish wrote:
 > Say I want to send somebody a full res photo. Can I zip compress either the
 > RAW image or a tiff with a reasonable decrease in size that will open
 > without compression losses?
 >
 > mike
 >
 >
Yes. Zip is a lossless compression. However, you may be disappointed
with the compression rates you get.


--
Ron Hunter rphunter.RemoveThis@charter.net<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

When creating a TIFF file with many programs you have several options
how to do this. One option is use ZIP compression (lossless). No
compression at all is another one and you even can do JPEG compression
(lossy) within a ZIP file. As ZIP is not designed for photos, I suppose
lossless JP2 compression will give smaller files. But with JP2 (using
decent software) you have very good control about the compression and
can do quite small files with no visible softness or artifacts at all.

-Michael
 >> Stay informed about: Can you zip raw or tiff without loss 

nospam.TakeThisOut@nospam.com (Keith) writes:

 > mike regish <mregish.TakeThisOut@comcast.net> wrote:
 >
  >> Say I want to send somebody a full res photo. Can I zip compress either the
  >> RAW image or a tiff with a reasonable decrease in size that will open
  >> without compression losses?

 > I recently had a 4mb tiff file that reduced to 1.5mb when saved as a
 > native Photoshop file, the tiff had no compression applied to it.

Sometimes there are actually big chunks of compressible data in TIFF
files -- especially if there are masks, for example. Or of there's a
large background that's pure white or black. Also, 48-bit files often
compress okay, because the algorithm can find that there rarely more
than 36 bits of data in those 48 bits, and can take advantage of it.
--
David Dyer-Bennet, <mailto:dd-b@dd-b.net>, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

"mike regish" <mregish.TakeThisOut@comcast.net> wrote in
news:0PudncDVGZjnls3fRVn-ig@comcast.com:

 > Say I want to send somebody a full res photo. Can I zip compress
 > either the RAW image or a tiff with a reasonable decrease in size that
 > will open without compression losses?

Tiff has a number of lossless compression options built in, and most RAW
files are already losslessly compressed.

If you ZIP and already compressed file, you are generally are wasting your
time.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

Alright, for the 2 mins it will take to actually find out...

1.03 gigs of raw files compressed to .98 gigs using winzip and max
compression...obviously no point.

but on the other hand

401mb of TIFFs (18megs each) compressed to 221 megs! Almost 50%
compression...might be worth it but the cost of storage these days is so
cheap its probably easier to get a new HD. You also have to worry that if
any part of the zip becomes corrupted you might loose a lot more then one
picture....

--
www.harryphotos.com
 >> Stay informed about: Can you zip raw or tiff without loss 

"Dave Cohen" <dave DeleteThis @example.net> writes:

 > zip is lossless compression, if it wasn't it would be useless for most
 > applications. How much compression you might get on a compressed file is
 > another issue.

Not all TIFF or RAW files are compressed. On my Olympus E-1, neither is
compressed (RAW files are ~ 11 megabytes, and I believe TIFF files are ~ 13
megabytes). I find bzip2 reduces the size of .ORF files by roughly 50%.

--
Michael Meissner
email: mrmnews DeleteThis @the-meissners.org
<a style='text-decoration: underline;' href="http://www.the-meissners.org" target="_blank">http://www.the-meissners.org</a><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

Dirty Harry wrote:
 > Alright, for the 2 mins it will take to actually find out...
 >
 > 1.03 gigs of raw files compressed to .98 gigs using winzip and max
 > compression...obviously no point.
 >
 > but on the other hand
 >
 > 401mb of TIFFs (18megs each) compressed to 221 megs! Almost 50%
 > compression...might be worth it but the cost of storage these days is so
 > cheap its probably easier to get a new HD. You also have to worry that if
 > any part of the zip becomes corrupted you might loose a lot more then one
 > picture....

Hi...

Respectfully suggest that if you're going to zip large tiff's for
storage or perhaps transmission to family members that you zip
them up individually...

Ken<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss 

"Ken Weitzel" <kweitzel RemoveThis @shaw.ca> wrote in message
news:HyX3e.888789$Xk.205679@pd7tw3no...
 >
 >
 > Dirty Harry wrote:
  > > Alright, for the 2 mins it will take to actually find out...
  > >
  > > 1.03 gigs of raw files compressed to .98 gigs using winzip and max
  > > compression...obviously no point.
  > >
  > > but on the other hand
  > >
  > > 401mb of TIFFs (18megs each) compressed to 221 megs! Almost 50%
  > > compression...might be worth it but the cost of storage these days is so
  > > cheap its probably easier to get a new HD. You also have to worry that
if
  > > any part of the zip becomes corrupted you might loose a lot more then
one
  > > picture....
 >
 > Hi...
 >
 > Respectfully suggest that if you're going to zip large tiff's for
 > storage or perhaps transmission to family members that you zip
 > them up individually...
 >
 > Ken
 >
When 200 gig hds are near 100 bucks I won't be zipping up anything For
sending to ppl I recomend jpegs....<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Can you zip raw or tiff without loss