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File names for various digital cameras and RAW extensions



 
 
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  #1  
Old October 23rd 07, 01:08 AM posted to rec.photo.digital,uk.rec.photo.misc,rec.photo.equipment.misc
[email protected]
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Posts: 182
Default File names for various digital cameras and RAW extensions

Two questions about recorded digital photo files:
1. Filename for photos : Canon with IMGxxx, Panasonic with Pxxx, Casio
with CIMGxxx, Sony with DSCxxx. What about others such as Pentax,
Nikon, Kodak, Olympus, Fuji, etc. ?
Could this name be changed prior to picture taken? or is this feature
built-in the camera that the photos will always have that file name,
plus the numbers that follow?
2. Why there are so many file extension for the RAW files? I heard
different extension name for different brand camera, and even
different name for same camera with different model. Example : Nikon
with .NEF extension. With this different extension name, does this
mean that the data must be read by a special softwares (as the one
that comes with the camera or special PSP or Photoshop) ? What
happens if you rename the file extension on purpose, can it be read by
PSP or photoshop? or it will become corrupt? Is there a common file
extension name, such as .RAW?
Thanks for info.

  #2  
Old October 23rd 07, 04:23 AM posted to rec.photo.digital,uk.rec.photo.misc,rec.photo.equipment.misc
ray
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Posts: 2,278
Default File names for various digital cameras and RAW extensions

On Mon, 22 Oct 2007 17:08:18 -0700, aniramca wrote:

Two questions about recorded digital photo files:
1. Filename for photos : Canon with IMGxxx, Panasonic with Pxxx, Casio
with CIMGxxx, Sony with DSCxxx. What about others such as Pentax,
Nikon, Kodak, Olympus, Fuji, etc. ?


My kodak P850 produces 100_nnnn.kdc for raw - nnnn represents a serial
number.

Could this name be changed prior to picture taken? or is this feature
built-in the camera that the photos will always have that file name,
plus the numbers that follow?
2. Why there are so many file extension for the RAW files? I heard
different extension name for different brand camera, and even
different name for same camera with different model. Example : Nikon
with .NEF extension. With this different extension name, does this
mean that the data must be read by a special softwares (as the one
that comes with the camera or special PSP or Photoshop) ? What
happens if you rename the file extension on purpose, can it be read by
PSP or photoshop? or it will become corrupt? Is there a common file
extension name, such as .RAW?
Thanks for info.


Don't know about MS - but *nix could not care less what the extension is -
it looks at the contents of the file - you can name it whatever you want.

  #3  
Old October 23rd 07, 05:38 AM posted to rec.photo.digital,uk.rec.photo.misc,rec.photo.equipment.misc
Floyd L. Davidson
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Posts: 5,138
Default File names for various digital cameras and RAW extensions

wrote:
With this different extension name, does this
mean that the data must be read by a special softwares (as the one
that comes with the camera or special PSP or Photoshop) ? What
happens if you rename the file extension on purpose, can it be read by
PSP or photoshop? or it will become corrupt? Is there a common file
extension name, such as .RAW?


There is no "RAW" format, as such. Each manufacturer
uses their own format, and chooses their own "standard"
for naming files too. Note that there is no direct
connection between the file name and the file format
either! Nikon, as one example, uses the same ".nef"
extension for several file formats, all of which are
very similar but different in some ways.

The actual distinctions between file formats are
embedded in the files, not the name. For major
differences, for example to indicate that a file is from
Canon, Pentax, Nikon, or whatever, the first few bytes
of the file are an indicator. That is referred to as a
"magic number", and is true of most unique file formats
(JPEG, .exe, TIFF, .dvi, .gz and so on all start with a
"magic number" to identify them uniquely).

Hence even if a file is renamed, virtually any software
that is designed to work with that type of file will
still be able to use it.

--
Floyd L. Davidson http://www.apaflo.com/floyd_davidson
Ukpeagvik (Barrow, Alaska)

  #6  
Old October 23rd 07, 05:37 PM posted to rec.photo.digital,uk.rec.photo.misc,rec.photo.equipment.misc
John Bean
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Posts: 584
Default File names for various digital cameras and RAW extensions

On Tue, 23 Oct 2007 11:19:33 +0100, "Trev"
trevbowdenAT.dsl.pipex.COM wrote:
There is a .raw


Yes.

but its not a camera raw format


Wrong, it *might* be. Panasonic cameras use .raw as a file
extension for their camera raw files.

and existed long before
digital cameras.


Yes, it did. It's never wise to trust a file extension to
identify a file type without checking the contents.

--
John Bean
  #7  
Old October 25th 07, 06:26 PM posted to rec.photo.digital,uk.rec.photo.misc,rec.photo.equipment.misc
Marco Schmidt
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Posts: 10
Default File names for various digital cameras and RAW extensions

fup2 rec.photo.digital

Floyd L. Davidson:

The actual distinctions between file formats are
embedded in the files, not the name. For major
differences, for example to indicate that a file is from
Canon, Pentax, Nikon, or whatever, the first few bytes
of the file are an indicator. That is referred to as a
"magic number", and is true of most unique file formats
(JPEG, .exe, TIFF, .dvi, .gz and so on all start with a
"magic number" to identify them uniquely).


"Uniquely" - in theory. To make things more complicated, some formats
get reused. As an example, Nikon's NEF (at least the variant I got) is
in fact a TIFF file with some private tags. When you open a 20 MB NEF
file with a regular image viewer that ignores file extensions (as it
should) and doesn't know about NEF (like ACDSee 3), all that is
displayed is the tiny RGB preview image.

However, people handling Nikon RAW files usually know what to do with
them anyway, so I wouldn't consider that a huge problem. If the file
extensions get lost and the person responsible for handling the files
doesn't know about their origin, it might become a problem, though.
 




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