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FORUMS Photography Talk by Genre General Photography Talk
Thread started 12 Jul 2016 (Tuesday) 06:45
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New to RAW image questions

 
Luckless
Goldmember
3,040 posts
Joined Mar 2012
PEI, Canada
Aug 08, 2016 07:16 |  #16

From a photographic stance there is no real desire to directly edit raw files in a normal workflow. It isn't needed, and it really serves no purpose, so typical software doesn't include that kind of functionality as an option. However, that doesn't mean it isn't possible to still go in with specialized software to do just that.

Which is a big reason why I don't really care all that much for the stance that various publications have been taking of "we can totally trust our photographers are being ethical because we're only taking raw files... Because this totally couldn't be bypassed..." as they're claiming they've done something to change things, without actually having achieved much of anything. Those who are truly dishonest about stuff are going to be pushing to find a way around it, and guess what? Googling really isn't all that difficult.


Canon EOS 7D | EF 28 f/1.8 | EF 85 f/1.8 | EF 70-200 f/4L | EF-S 17-55 | Sigma 150-500
Flickr: Real-Lucklessexternal link

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JWdlft
Senior Member
283 posts
Joined Feb 2013
Aug 08, 2016 18:34 |  #17

I don't know the scientific stuff, but raw sensor data is numbers, voltages or whatever caused by light hitting a sensel (one pixel? whatever), it is not RGB values. Those are created in the processing to a visible image format.
So it would be possible to change the raw data if you really wanted to, the average old hex-editor could do the trick, as they are only bits in a file, but a controlled change -like retouching- is probably more trouble than it's worth to program because every camera or sensor needs it's own conversion TO image format, so also TO "raw" format, if it's possible.




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Luckless
Goldmember
3,040 posts
Joined Mar 2012
PEI, Canada
Aug 08, 2016 20:15 as a reply to JWdlft's post |  #18

Yes, each camera would have its own specifications of its sensor to deal with, but all that information is part of raw converters. It is possible to pull it out of the open source projects if you don't want to reverse engineer the values yourself, and fairly trivial to write a program that re-encodes a .tiff file or something as values that accurately approximate what the camera's sensors would have had to record to produce that same 'converted' image.

Not only that, but I linked to someone who seems to have already done just that in an earlier post:
https://jabriffa.wordp​ress.com ...writing-camera-raw-files/ (external link)


Canon EOS 7D | EF 28 f/1.8 | EF 85 f/1.8 | EF 70-200 f/4L | EF-S 17-55 | Sigma 150-500
Flickr: Real-Lucklessexternal link

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Transient ­ W.A.S.P.
THREAD ­ STARTER
Member
Transient W.A.S.P.'s Avatar
Joined May 2016
Prague, Czech Republic
Aug 21, 2016 11:48 |  #19

Thanks, everyone. Very informative. :)


Cheers,
Transient W.A.S.P.

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New to RAW image questions
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