Question about RAW and file size

[TheManWhoJaped]

I've recently come across something that made me wonder about converting RAW files and about how much more there is to know about it.

A friend of mine just e-mailed me a picture (compressed TIFF) that he took at another friends wedding and when I opened the file in Photoshop the file size was 70 MB. Apparently he had shot RAW and the converted the picture with ACR and changed the file size to 4085 by 6144 with resolution at 300 pixels/inch. Now I've usually left the file size to 2000 by 3008 (so there's no plus or minus signs after the 6 MP, with my camera) with the resolution at 300 pixels/inch. So now I'm wondering why anyone would change the size settings by that much. What do you guys do ? Have I been doing it wrong ? I always thought that changing the settings would just interpolate the file size larger but does it actually bring something more to the file ?

 

[jfinite]

There are ways to uprez files while minimizing loss of quality, such as fractal programs. It's possible he used one of these programs to uprez the pic. People may do this when submitting photos to stock agencies that require large files or when printing at a large size. Most people have no need to uprez a file.

I've recently come across something that made me wonder about
converting RAW files and about how much more there is to know about
it.

A friend of mine just e-mailed me a picture (compressed TIFF) that
he took at another friends wedding and when I opened the file in
Photoshop the file size was 70 MB. Apparently he had shot RAW and
the converted the picture with ACR and changed the file size to
4085 by 6144 with resolution at 300 pixels/inch. Now I've usually
left the file size to 2000 by 3008 (so there's no plus or minus
signs after the 6 MP, with my camera) with the resolution at 300
pixels/inch. So now I'm wondering why anyone would change the size
settings by that much. What do you guys do ? Have I been doing it
wrong ? I always thought that changing the settings would just
interpolate the file size larger but does it actually bring
something more to the file ?

--



http://www.pbase.com/jfinite

 

[Barrie Davis]

If you need a large file, (or just want to impress the heck out of your friends who have not yet discovered the resolution options in ACR) then up (or down) rezzing is best done from the RAW data, before everything has been fixed in a Jpeg or Tiff.

At least, that is the theory...

Whether it actually IS better than the sophisticated programs which are around for the same task, but starting from Tiff/Jpeg??? ....well... (shrugs)
-----------

Was the file sent to you in 16 bit, too....? Just to make sure it was completely unwieldy?!
--
Regards,
Baz

 

[David Hughes124436]

Have you thought about asking your friend this?

Regards, David

 

[Chato]

I did some laborious tests with my images, saving the RAW out at normal max and uprezzed max, out of the camera. And it certainly looked better if I reduced to normal max AFTER I brought it into PS.

Nothing spectacular, but improved to the point that I could see the difference, even if it was a small one.

Dave

If you need a large file, (or just want to impress the heck out of
your friends who have not yet discovered the resolution options in
ACR) then up (or down) rezzing is best done from the RAW data,
before everything has been fixed in a Jpeg or Tiff.

At least, that is the theory...

Whether it actually IS better than the sophisticated programs which
are around for the same task, but starting from Tiff/Jpeg???
....well... (shrugs)
-----------
Was the file sent to you in 16 bit, too....? Just to make sure it
was completely unwieldy?!
--
Regards,
Baz

 

[TheManWhoJaped]

..I guess you learn something new everyday. The file wasn't a 16 bit file but since I don't normally use compressed Tiff I thought that there might be something that I'm not awere of in the converting process.

I would have asked this of my friend but he's on a well deserved vacition and won't be back in the country for another two weeks.Almost the last thing he did before leaving was e-mailing me the file.So I figured someone here will know better than me

Thanks all and happy shooting

TP