Re: Compressed Raw

[herschel mair <herschelmair@xxxxxxxxx>]

Hi Maggie,

Firstly let me say a word about Phase 1' software and PS CS Raw processor.

Having used both  quite extensively I must say the as far as quality goes there isn't much between them but when it comes to intuitive operation and convenience I give the cake to Photoshop. Once you get to know it, you'll find it very easy to use.

 

I trust that you are not woking on images and then saving them onto your CF card... Are you?

If you do then you'll loose the original image.

 

You can download the DNG converter and read about what it is from the Adobe website.

Here's a workflow suggestion:

 

1. Save the images form your CF card (NEF Files) to a folder on your computer.

2. Convert them to DNG files

3. Write them all to a CD and label it and file it away.

4. Open a NEF image, do the raw processing and immediately save it as a photoshop (psd) file (That way your raw (nef) files never get changed and if you have adjustment layers etc., you keep them flexible)

5. Once you've done what you want to do to the image, output the corrected, final image in the format that is required by the client (JPEG, TIFF or whatever) so now you'd have 3 copies of the image on your computer; The original NEF file (Untouched), a photoshop "Work" file and a final output file in the required format.

You also have the DNG files on a disk

 

Hope this helps

 

Herschel

 

 

 

margaret lucas <maggie@xxxxxxxxxxxxxx> wrote:

hi,

i've just changed shooting mode to raw. on D100 there are 2 choices.
one is compressed (i think, writing is small and hard to see in teeny
lcd) i chose plain raw. opened NEF file in photoshop. amazing array of
options. i guess i should have duplicated the file first b/c it looks
like (ridiculous, extreme) changes i made while experimenting, are
permanent. b/c i went back to download the orig file from camera and it
appears as altered version.

herschel, can you say how to convert raw to DNG format please?

tia,
maggie
On Apr 29, 2005, at 12:07 PM, herschel mair wrote:

> Raw files are actually black and white files with data about which
> cell relates to which colour. All this makes a much smaller file that
> a Tiff file so I guess you could call it compressed. However the data
> is all there and nothing is lost in the process. Once you open that
> file on a computer it converts all the black and white data into a
> colour image via a process called
> DE-MOSAICING using rather complicated algorithms (Each manufacturer of
> camera and software have thier own version of this sofware) so
> depending on whether you open the image in Photoshop or Phase One or
> the maufacturers software, you could end up with quite different
> images. these images are now uncompressed, bitmap-type images. They
> can then be saved as uncompressed TIFF Files or even compressed TIFF
> files without any loss. Or you can compress them into JPEG files and
> choose how much quality you want to lose. Either way you should
> convert your raw images into the universal DNG format for posterity.
>  
> herschel
>
> Llorenç Herrera wrote:
>>
>> Hi, this is correct about Nikon D-70, it compresses de RAW files. But
>> it?s a non-degrading compression, nothing related to JPEG
>> compression. It means that those RAW compression does not affects in
>> any way the final image quality.
>>  
>> JPG, MPEG, MP3, OOG ? etc. are all degrading-type compression
>> techniques. The final result shows imperfections when looked very
>> near (or heard paying lot of attention)
>> LZW, ZIP, RAR, Compressed-TIFF ? etc are all NON-degrading-type
>> compressiong techniques. The final result shows EXACTLY the same
>> digital data you can see if it weren?t compressed.
>>  
>> I don?t know exactly, but I bet that the kind of internal compression
>> Nikon uses on its RAW files is one kind of LZW.
>>  
>> I don?t know anything about Nikon D100
>>  
>> __________________
>> Llorenç Herrera Aznar
>> http://www.lorenzoherrera.com
>> http://www.fotopunto.com
>>  
>>
>> De: owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx
>> [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx] En nombre de Jerry
>> McCown
>> Enviado el: viernes, 29 de abril de 2005 0:02
>> Para: List for Photo/Imaging Educators - Professionals - Students
>> Asunto: Compressed Raw
>>  
>> My D100 default setting is compressed raw and I had to go in and turn
>> the compression off as it was taking WAY too long to save the file.
>>
>> LScottPht@xxxxxxx wrote:
>>
>> With the Nikon D70, the RAW images are compressed RAW images. I will
>> have to go back and look at my manual, but I think it even says so in
>> the manual. I'm not sure why the camera shoots compressed RAW images,
>> perhaps others here could answer that.
>>  
>> Leslie
>>  
>>> I don't think this is correct, RAW files are not compressed from
>>> what I understand
>>
>>  
>
> Herschel Mair
>
> H.O.D. Photography Dept, Higher College of Technology
> Al Khuwair
> Sultinate of Oman
> 9899673
>
> Do you Yahoo!?
> Make Yahoo! your home page

Herschel Mair

H.O.D. Photography Dept, Higher College of Technology
Al Khuwair
Sultinate of Oman
9899673

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com