6 Replies Latest reply on Jun 14, 2010 3:03 AM by Peter&Steven

    Sigma X3F to DNG conversion - suggested workflow?

    ThomasKrueger

      Now the latest version of Adobe Camera Raw 6.1 supports all Sigma cameras (DP1, DP1s, DP2, SD9,  SD10, SD14).

      http://www.adobe.com/products/photoshop/cameraraw.html


      Do I have to tick the linear DNG in options of Camera Raw 6.1 ?

      Sigma/Foveon X3F images and DNG

      http://www.barrypearson.co.uk/articles/dng/specification.htm#x3f

       

      I'd like to know if ALL raw data is extracted from the X3F raw file for the conversion to DNG. So is it safe to store only the DNG file for the archive or should the original X3F raw data be embedded also in the converted DNG file?

       

       

       

       


        • 1. Re: Sigma X3F to DNG conversion - suggested workflow?
          deejjjaaaa Level 2

          Now the latest version of Adobe Camera Raw 6.1 supports all Sigma
          cameras (DP1, DP1s, DP2, SD9,  SD10, SD14).

          http://www.adobe.com/products/photoshop/cameraraw.html

           

          actually ACR was supporting them long before 6.1 - they just forgot to mention all models @ that web page...

           

           

           

          I'd like to
          know if ALL raw data is extracted from the X3F raw file for the
          conversion to DNG.

           

          Adobe DNG converter is known not to store all the raw data read off the sensor for some cameras during the conversion

           

          for example : http://forums.adobe.com/message/1210138#1210138

           

          says Gabor Shorr (author of Rawnalyze)  : "...Anyway, back to the "lost data": the DNG converter cuts off the masked  pixels from the K10 and K200 raw data (the Starist and the K100 do not  record masked pixels; I don't know the others). These pixels are at the  edge of the recorded image area, in these cases at the right and bottom  edge. That's how the data looks if these strips are not cut off:

          http://www.panopeeper.com/Demo/MaskedPixels_PentaxK10_ISO100_a.GIF  ;
          and up-close, with extreme contrast:
          http://www.panopeeper.com/Demo/MaskedPixels_PentaxK10_ISO100_b.GIF  ; ..."

           

          The same was confirmed for example for Pentax K20D and some Nikon cameras too...

           

          so you can never be sure what Adobe DNG converter does and does not

           

          you might ask if that data is important... well sometimes it is - http://forums.dpreview.com/forums/read.asp?forum=1036&message=34272518

           

           

          "...they aren't completely useless as one can do several different things  with them, as follows:

           

           

          1)  Use them to measure and back out Wide Band Vertical Patterns in the  K10D and K20D.


          2)  Use them to tweak out the magenta to green tingeing from left to  right that the K10D has at high ISO's or for highly boosted as to  exposure and contrast images.


          3)  Use them to eliminate the border tingeing of the K20D that occurs in  the same cases as the tingeing of the K10D above as is done using my  Raw Border Correction (RBC) utility for the K20D.


          4)  Use them to measure and eliminate from the raw data the "Thin Green  Line" problem of the K-7 for some camera samples when the sensor got  warm had it not been fixed with a firmware update from Pentax.


          5)  Possibly use them to determine a different method of black level  compensation for the K-x if necessary if conventional raw conversion  methods produce any Horizontal Pattern Noise (HPN).


          Not entirely useless emoticon - wink

           

           

           

          Regards, GordonBGood..."


          but Big Brother (that 'd be mr Knoll no less) thinks on your behalf what is useful and what is not...

           

          so read below

           

          So is it safe to store only the DNG file for the
          archive or should the original X3F raw data be embedded also in the
          converted DNG file?

           

           

          http://forums.adobe.com/message/1210133#1210133

           

          says Eric Chan of ACR team  : "...for archival purposes I recommend (and practice) safely storing the  original raw files in the form that they came off the camera, whether  they be DNG or non-DNG..."

          • 2. Re: Sigma X3F to DNG conversion - suggested workflow?
            ThomasKrueger Level 1

            Thanks for the answer, but I still want to know what is actually stored from the X3F file inside the DNG file.

            • 3. Re: Sigma X3F to DNG conversion - suggested workflow?
              deejjjaaaa Level 2
              but I still want to know what is actually stored from the X3F file inside the DNG file

               

              I guess you understand that the answer will be like ~all the data necessary to render the image the same way using Adobe raw converters.

              • 4. Re: Sigma X3F to DNG conversion - suggested workflow?
                Level 4

                deejjjaaaa wrote:

                 

                 

                Adobe DNG converter is known not to store all the raw data read off the sensor for some cameras during the conversion

                 

                …The same was confirmed for example for Pentax K20D and some Nikon cameras too...

                 

                …so you can never be sure what Adobe DNG converter does and does not

                 

                It's not surprising that this point is not often emphasized in these Adobe forums.  Thank you for bringing this up again.

                 

                 

                Wo Tai Lao Le

                我太老了

                • 5. Re: Sigma X3F to DNG conversion - suggested workflow?
                  deejjjaaaa Level 2
                  It's not surprising that this point is not often emphasized in these Adobe forums.

                   

                  well, even Barry (Pearson that is), albeit through the clenched teeth, referred to that on his site... not after calling that FUD initially of course

                  • 6. Re: Sigma X3F to DNG conversion - suggested workflow?
                    Peter&Steven

                    I think that what is stored in the DNG for sigma files is very different from the raw data. For example there is mandatory (and ISO-dependant) noise reduction that is applied before writing the DNG.

                     

                    I'm pretty sure of that because the software "RAW developer" was only able to open DP1 files once converted to DNG, and that these files looked exactly the same in Raw developer as in ACR : that is with noise reduction at high ISO.