RAW NEF DNG ecc ecc

“ domanda: convertendo un raw in dng, si mantiene la possibilità di beneficiare di migliori convertitori/demosaicizzatori futuri o si "cristallizza" alla versione usata al momento di conversione in DNG? „

“ domanda: convertendo un raw in dng, si mantiene la possibilità di beneficiare di migliori convertitori/demosaicizzatori futuri o si "cristallizza" alla versione usata al momento di conversione in DNG? „

“ .......
NC: Thanks. So with all this in mind, is it still accurate to say that the image data in _all_ DNG files is _raw_ data?

EC: No, not necessarily. The reason is that the DNG file format can also store non-raw data. For example, you can feed a JPEG to the DNG Converter and have it spit out a DNG. However, that DNG isn't raw, of course (you can't take a rendered file like a JPEG and go “backwards” to make it raw again … it would be as miraculous as uncooking a steak!).

At its most essential level, DNG is just a container of image data and its associated metadata. It can hold raw image data (a.k.a., scene-referred data), and it can also hold rendered image data (a.k.a., output-referred data). For raw data, the data can be in the mosaic form, or it can be demosaiced (so-called “linear DNG”). For example, Foveon cameras and BetterLight scanning backs store scene-referred linear data, but they aren't in mosaic form.

NC: Great, got it. Just one final question, if you don't mind: if I convert a raw file from a _typical_ DSLR (eg my Canon 5D Mark II) is the scene-referred data contained in that DNG any different than the original scene-referred data in the native raw file?

EC: No, they should be identical in the typical case (e.g., Nikon SLR, Canon SLR). An exception in the case of Canon SLR is the S-RAW and M-RAW modes. Those are not really mosaic files; they are stored in a quasi-JPEG like YCbCr space (luminance and color components), which DNG does not natively support. As a result, if you convert a S-RAW or M-RAW Canon file to DNG, it will get mapped to a RGB color space before getting stored into the DNG container (and hence will not be the same as the original).

NC: Thanks a million for taking the time to explain all this to me. It's a huge help! I've been a big fan of DNG for years and I'm glad my understanding wasn't so far off that I got myself into trouble ?

I know that this kind of support isn't technically part of your job and it means a lot to me and many of my colleagues that you are so willing to share your expertise.”

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If the above all seems too technical, the main point you really need to understand is that if you shoot with a DSLR and convert your raw files to DNG you are not losing any data or image quality (assuming you're capturing raw not sRaw). And the advantages of DNG are significant; see the links below for more about this.

As I mentioned in the introduction to this post, I believe in the practical, flexible, long term usefulness of DNG and will continue to use them as my raw file format. I welcome your comments and questions!

You can get more info about DNG at the links below:

Adobe DNG resource pages
Wikipedia „

“ domanda: convertendo un raw in dng, si mantiene la possibilità di beneficiare di migliori convertitori/demosaicizzatori futuri o si "cristallizza" alla versione usata al momento di conversione in DNG? „

“ " domanda: convertendo un raw in dng, si mantiene la possibilità di beneficiare di migliori convertitori/demosaicizzatori futuri o si "cristallizza" alla versione usata al momento di conversione in DNG?"

Quando converti un raw in un DNG incorpori direttamente i dati mosaicizzati; quindi verranno demosaicizzati con l'algoritmo del programma che userai per aprirlo. „

“ Mi permetto di insistere .
Se per risparmiare il 20% di spazio devo comunque perdere tempo a trasformare i miei Nef in DNG quel tempo lo dedico a selezionare il 70% dei NEF buoni ed ho ottenuto un risultato utile. „

“ Figurati Sorriso

In ogni caso sembra che la conversione in DNG sia necessaria se si vuole usufruire del nuovo algoritmo di Adobe.
L'ho provato sui raw della GFX e effettivamente è un grosso passo in avanti sui dettagli più fini e soppressione del false-color.

Peccato che il DNG migliorato pesi il doppio del raw originale Triste. „