Canon Digital Rebel XT, RAW files, and Photoshop

McLeod wrote:

On Mon, 23 May 2005 10:40:59 -0400, Alan Browne
wrote:


Then, why, oh why, do they need to encrypt the data?


Who says it is encrypted? Don't take everything you read on the
internet at face value.

http://forums.dpreview.com/forums/re...ssage=13165847

Et tu McLeod!! That link is a personal opinion. Encryption covers a
lot of ground and can be very robust to merely irritating as it appears
Nikon have done.

Read instead:
http://www.dpreview.com/news/0504/05...ninterview.asp

"A firestorm of controversy recently erupted when Thomas Knoll of Adobe
accused Nikon of encrypting the white balance data in the D2X and D2Hs
cameras, thus preventing Adobe from fully supporting these cameras.

I cracked this encryption on April 15, and updated dcraw.c and parse.c
on April 17. So "dcraw -w" now works correctly with all Nikon cameras.

This is not a new problem. Phase One, Sony, Foveon, and Canon all apply
some form of encryption to their RAW files. Dcraw decodes them all --
you can easily find decryption code by searching for the ^ operator.

Compression is not encryption. Phase One and Sony do encryption only.
Kodak does compression only. Canon, Nikon, and Foveon compress the image
data and encrypt some of the metadata."

--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: Remove FreeLunch.

McLeod wrote:
[snip]
http://www.letsgodigital.org/en/news...tory_3103.html

We've all read that many times before, and it is the same bovine
excrement it always was. It is about SDKs. And they are not an answer.

The Nikon SDK doesn't provide the access to the sensor data that a
proper Raw processor needs. The de-mosaicing (or colour-interpolation)
is does within the DLL, and the multi-colour pixel data is provided to
the caller.

Here is a description the terrible mess that SDKs give to package
developers. They are bad beyond belief!

http://www.openraw.org/comments/?id=1

SDKs don't address the real requirements of many photographers, or
perhaps most users of photographs. The fact that Nikon appear to think
they are OK just indicates how out of touch they are with the
requirements. Here is a test - could Nikon implement Nikon Capture on
top of their SDK? Would they want to?

--
Barry Pearson
http://www.barry.pearson.name/photography/
http://www.birdsandanimals.info/

Alan Browne wrote:
Barry Pearson wrote:

We don't need to be apologists for the camera manufacturers.

I don't mean to pick solely on Nikon, although they seem to me the
most
sinister in this respect, to date.

We all have to be wary of all of the OEM's and what their camera s/w
does after we have caught our images.

This topic is about to escalate! The lobby group OpenRAW and others
have stepped up their activity. The main content of these pages is the
same:

http://www.luminous-landscape.com/essays/raw-flaw.shtml

http://www.openraw.org/actnow/

The OpenRAW page above has lots of addresses of camera manufacturers.
(I intend to do my bit).

And, of course, rawformat has been running an on-line petition for DNG
for some time. (See the right hand column).

http://www.rawformat.com/

--
Barry Pearson
http://www.barry.pearson.name/photography/
http://www.birdsandanimals.info/

Barry Pearson wrote:


And, of course, rawformat has been running an on-line petition for DNG
for some time. (See the right hand column).

Damnit, now you're forcing me to be proactive!

--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: Remove FreeLunch.

John Francis wrote:
[snip]
With DNG 3.x you can apparently just embed the MakerNote tag, which
is where almost all the extra metadata can be found. You still can't
get at the fields within it easily, but you haven't lost the data.
[snip]

This is getting even better! Ignore BOTH of my previous responses. I
posed a question about Pentax on the Adobe forums, and Thomas Knoll
responded:

"The code change in ACR/DNG 3.1 that preserves private MakerNotes
applies to all formats that store their private data using the Exif
MakerNote format, which includes Pentax.

"These MakerNotes are often byte order or offset dependent, so what I'm
doing to preserve this data safely is repackaging it into the
DNGPrivateData tag. This repackaging stores the source file's byte
order and the original file offset to the MakerNote, along with the
MakerNote data itself.

"This allows an application that understands the MakerNote format for a
particular camera to find the MakerNote data, along with the original
byte order and file offset, and thus parse the MakerNote data correctly
from the DNG file."

Yippee!

But what a shocking waste of time it is. There is only one answer - ALL
cameras to support a Common Raw Format, preferably DNG.

--
Barry Pearson
http://www.barry.pearson.name/photography/
http://www.birdsandanimals.info/

In article .com,
Barry Pearson wrote:
John Francis wrote:
[snip]
With DNG 3.x you can apparently just embed the MakerNote tag, which
is where almost all the extra metadata can be found. You still can't
get at the fields within it easily, but you haven't lost the data.
[snip]

This is getting even better! Ignore BOTH of my previous responses. I
posed a question about Pentax on the Adobe forums, and Thomas Knoll
responded:

"The code change in ACR/DNG 3.1 that preserves private MakerNotes
applies to all formats that store their private data using the Exif
MakerNote format, which includes Pentax.

That was my understanding - I'm glad to see it confirmed.

I'm almost ready to start converting all my saved RAW images to DNG

In message ,
"G.T." wrote:

Thanks, that got me to re-read Adobe's site. It looks like I can use DNG
Version 3.1 to convert Rebel XT RAW files to DNG, and then the Camera Raw
Plugin from CS to read them.

Yep, and that's a very good way for people with 20D images that show
banding, who don't have CS2. DNG 3.1 removes the bulk of the banding.
--


John P Sheehy