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the difference between raw and tiff format

 
 
jamie
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      11-11-2004, 05:58 PM
Hi there

Some digicams have tiff support and some has raw support for images
what is difference between these two formats.

Thanks in advance

Jamie


 
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Gene Palmiter
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      11-11-2004, 06:52 PM
Your camera processes the data to make a photograph that you see. It adjusts
for its best guess (maybe with your guidance) of the color temperature of
the light, it sharpens, it adjusts contrast, size...etc. One of the things
it can do is make a Tiff file that is large or a Jpg file that is smaller
but gets that way by tossing out some of the information.

You can choose to have the processing that the camera performs delayed. You
can, with the right plug-ins do that sort of thing in Photoshop or some
other software. By doing it then you can make the decisions on how much
adjusting you want to give each image. You might decide to do it in a couple
of different ways. And...you are doing it with more information to start
with than if you were working on a Jpg....more bit depth.

I started using the RAW data a few months ago as I was trying to squeeze a
little more quality out of my 4mp camera. I can use the histogram to limit
the amount of contrast on a sunny day...or expand a flat scene. It really is
nice....but extra work.

Also of note....Adobe is not distributing the Adobe Digital Negative
program. It saves your proprietary RAW data in a generic sort of file that
is more likely to be readable in the distant future...but its still
unprocessed and holds all the data ....and its much smaller than a RAW.


"jamie" <(E-Mail Removed)> wrote in message
news:cn098m$k5$(E-Mail Removed)...
> Hi there
>
> Some digicams have tiff support and some has raw support for images
> what is difference between these two formats.
>
> Thanks in advance
>
> Jamie
>
>



 
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sid derra
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      11-11-2004, 07:16 PM
"Gene Palmiter" <(E-Mail Removed)> wrote in message
newsxOkd.2960$Bj2.2876@trndny01...
> Also of note....Adobe is not distributing the Adobe Digital Negative
> program.


just cos i am a little confused by this last paragraph: do you mean "is
_not_" or "is _now_ distributing"?

sid


 
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Roland Karlsson
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      11-11-2004, 10:11 PM
"jamie" <(E-Mail Removed)> wrote in news:cn098m$k5$1@ctb-
nnrp2.saix.net:

> Some digicams have tiff support and some has raw support for images
> what is difference between these two formats.


The RAW format is the (almost) RAW digitized data from the sensor.
There is only some noise reduction made. For most cameras, it is
also a Bayer pattern format, i.e. it is really like an ordianry B&W
image where 50% of the pixels are green, 25% blue and 25% red. RAW
image format is propiarety, i.e. not standardized. RAW images might,
or might not, be losslessy compressed. They might be any number of bits
per pixel, e.g. 10 or 12. RAW format is the most compact format for
storing pictures that still contain all information. The image is
useless without doing an interpolation step. This step is in principle
identical for all Bayer cameras, but it is almost always made with
the manufacturers own conversion program or at least plugin.

TIF is a standard format that can contain e.g. RGB images. It is
usually 8 or 16 bit, where 8 bit uses gamma compression of the
dynamic range and 16 bit is normally linear. A TIF image is much
larger than a RAW image. It is also an interpolated version of Bayer
images - i.e. a useful image - but with some losses. Losses that
future RAW to RGB converters might be able to minimize. TIF images
might, or might not, be losslessy compressed.



/Roland
 
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Gene Palmiter
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      11-11-2004, 11:27 PM

That should read "Now"...sorry...tired fingers and eyes.


"sid derra" <ng_NO_@_SPAM_emolife.net> wrote in message
news:(E-Mail Removed)...
> "Gene Palmiter" <(E-Mail Removed)> wrote in message
> newsxOkd.2960$Bj2.2876@trndny01...
> > Also of note....Adobe is not distributing the Adobe Digital Negative
> > program.

>
> just cos i am a little confused by this last paragraph: do you mean "is
> _not_" or "is _now_ distributing"?
>
> sid
>
>



 
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sid derra
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      11-12-2004, 03:55 AM
"Gene Palmiter" <(E-Mail Removed)> wrote in message
news:nzSkd.4024$jP4.3937@trndny07...
>
> That should read "Now"...sorry...tired fingers and eyes.


i hear ya... its 5am here and i have been studying for 14 hours straight.
so - time to get some rest for me as well.

rock on.


 
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