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Need help on E-420 RAW files

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  • Need help on E-420 RAW files

    Hi,

    I am using an Olympus E-420 camera with 40-50 mm and 14-42mm lenses.It is a 10 MP camera.

    Few days back, I noticed that when I shoot in RAW, and open the files in any photo editor, it shows megapixels as 1.92 MP. If I shoot in Jpg with large format, it is coming to 9.9 mps. The file size for both are almost same( 8-9 MB).

    Even with RAW+ jpg format, RAW files are of only 1.92 mega pixels. Why is this so?

    Is there any setting that I have messed up?

    Why am I not getting 10 MP resolution with RAW files?

    Please help.Any pointers will be appreciated.



    Thank you,

    Ruby.

  • #2
    Re: Need help on E-420 RAW files

    Hmm. Odd that.

    You usually need to use special measures or plugins and the like to import a raw file into an image editor.

    However: I know that each Raw file also includes a low resolution jpeg intended for viewing purposes. I wonder if you have managed to open that instead of the raw data.


    Pete
    Look, I'm an old man. I shouldn't be expected to put up with this.


    Pete's photoblog Misleading the public since 2010.

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    • #3
      Re: Need help on E-420 RAW files

      What software are you using to open the RAW files? I sounds to me like the software is only displaying an embedded JPEG thumbnail in the original RAW file.

      Ian
      Founder and editor of:
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      • #4
        Re: Need help on E-420 RAW files

        The embeded jpeg in e-420 raw file is 1600px x 1200px, now even at the highest quality jpeg setting it would only result in a less than 1mb file size,

        This leads me to belive that your editor/veiwer is converting the raw file to jpeg on the fly. .knowing the software you are using would be a help.
        Regards Paul.
        One day I hope to be the person my dogs think I am.

        https://www.flickr.com/photos/paul_silk/

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        • #5
          Re: Need help on E-420 RAW files

          Originally posted by Paul_S View Post
          The embeded jpeg in e-420 raw file is 1600px x 1200px, now even at the highest quality jpeg setting it would only result in a less than 1mb file size,

          This leads me to belive that your editor/veiwer is converting the raw file to jpeg on the fly. .knowing the software you are using would be a help.
          1600x1200 will be computed as 1.92MP as the OP reported, so I don't think there is any conversion going on, just the extraction of the embedded JPEG.

          Ian
          Founder and editor of:
          Olympus UK E-System User Group (http://e-group.uk.net)
          Four Thirds User (http://fourthirds-user.com)
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          • #6
            Re: Need help on E-420 RAW files

            Originally posted by Ian View Post
            1600x1200 will be computed as 1.92MP as the OP reported, so I don't think there is any conversion going on, just the extraction of the embedded JPEG.

            Ian

            True Ian if it showing the uncompressed size.

            Just for general info the embedded preveiw of the E-620 and E-30 ORFS are much larger at 3200px X 2400px.
            Regards Paul.
            One day I hope to be the person my dogs think I am.

            https://www.flickr.com/photos/paul_silk/

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            • #7
              Re: Need help on E-420 RAW files

              Originally posted by Paul_S View Post
              True Ian if it showing the uncompressed size.
              Sorry for any confusion Paul, it's mega pixels (not bytes), which is regardless of compression

              Ian
              Founder and editor of:
              Olympus UK E-System User Group (http://e-group.uk.net)
              Four Thirds User (http://fourthirds-user.com)
              Digital Photography Now (http://dpnow.com)
              Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

              Twitter: www.twitter.com/ian_burley
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              • #8
                Re: Need help on E-420 RAW files

                Thank you Snaarman, Ian and Paul , for your responses.

                I guess I was seeing the embedded and scaled down image , as you people suggested.
                I was opening them in photoshop and Irfanview.
                When I opened in Olympus master and converted to jpg, it is showing as 9.98 MP :-) ( could not find where to see the MPs for the RAW File in Olympus master)

                Thank you again for the help.

                Cheers,
                Ruby.

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                • #9
                  Re: Need help on E-420 RAW files

                  Originally posted by ruby_barbs View Post
                  Hi,

                  I am using an Olympus E-420 camera with 40-50 mm and 14-42mm lenses.It is a 10 MP camera.

                  Few days back, I noticed that when I shoot in RAW, and open the files in any photo editor, it shows megapixels as 1.92 MP. If I shoot in Jpg with large format, it is coming to 9.9 mps. The file size for both are almost same( 8-9 MB).

                  Even with RAW+ jpg format, RAW files are of only 1.92 mega pixels. Why is this so?

                  Is there any setting that I have messed up?

                  Why am I not getting 10 MP resolution with RAW files?

                  Please help.Any pointers will be appreciated.



                  Thank you,

                  Ruby.
                  Mp isnt the same as file size
                  depends on how much light to dark ratio there is
                  my recent RAW are coming around 6-8 mega pixels with not much pp done
                  i have gotten up to 13-15 with loads of pp

                  check the picture size you are getting
                  and if you do want good jpegs set the menu for superfine large

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                  • #10
                    Re: Need help on E-420 RAW files

                    Originally posted by toady View Post
                    Mp isnt the same as file size
                    depends on how much light to dark ratio there is
                    my recent RAW are coming around 6-8 mega pixels with not much pp done
                    i have gotten up to 13-15 with loads of pp

                    check the picture size you are getting
                    and if you do want good jpegs set the menu for superfine large
                    No that doesn't make sense.

                    MP = mega pixels, or the number of image pixels

                    MB = megabytes, or the quantity of bytes in the file

                    Unless you crop or resize the image the number of pixels in an image file remains constant.

                    In uncompressed form the number of bytes in a 24-bit RGB image (8-bits per byte and 3 bytes in all, so 3x8=24) the number of bytes is 3x the number of pixels and then divided by a million (or 1024x1024).

                    JPEG, though, is compressed, so the number of bytes can vary significantly, even though the number of pixels stays the same.

                    With a 10MP camera the maximum possible file size is 30MB (3x10MP). With JPEG compression the file is normally well below 10MB, but if - as Toady suggests - you post process, you can increase the file size because compression is less effective. This can be because of increasing sharpness and even adding noise, which is a technique for adding depth to some types of image. The noisier the image the less it can be compressed.

                    Ian
                    Last edited by Ian; 11th March 2011, 02:50 PM. Reason: Added more info
                    Founder and editor of:
                    Olympus UK E-System User Group (http://e-group.uk.net)
                    Four Thirds User (http://fourthirds-user.com)
                    Digital Photography Now (http://dpnow.com)
                    Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

                    Twitter: www.twitter.com/ian_burley
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                    NEW: My personal BLOG ianburley.com
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                    • #11
                      Re: Need help on E-420 RAW files

                      Originally posted by Ian View Post
                      No that doesn't make sense.

                      MP = mega pixels, or the number of image pixels

                      MB = megabytes, or the quantity of bytes in the file

                      Unless you crop or resize the image the number of pixels in an image file remains constant.

                      In uncompressed form the number of bytes in a 24-bit RGB image (8-bits per byte and 3 bytes in all, so 3x8=24) the number of bytes is 3x the number of pixels and then divided by a million (or 1024x1024).

                      JPEG, though, is compressed, so the number of bytes can vary significantly, even though the number of pixels stays the same.

                      With a 10MP camera the maximum possible file size is 30MB (3x10MP). With JPEG compression the file is normally well below 10MB, but if - as Toady suggests - you post process, you can increase the file size because compression is less effective. This can be because of increasing sharpness and even adding noise, which is a technique for adding depth to some types of image. The noisier the image the less it can be compressed.

                      Ian
                      thanks ian
                      my ignorance not having used raw a lot or even knowing the information
                      i checked my raw files and they are indeed 10.1 Mb
                      the corresponding processed tif is 33.6
                      and the final jpeg..13.7

                      this is all new to me
                      cheers
                      geof

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