Interesting Fovean B&W blog articles

Discussion in 'Sigma DP Forum' started by pdk42, Aug 25, 2014.

  1. pdk42

    pdk42 SC Regular

    35
    Apr 4, 2014
    I found this series of 3 blogs really interesting. The author writes well and makes some really good observations on the strengths and weaknesses of the Sigma cameras.

    http://www.ultrasomething.com/photography/2014/04/sigma-vs-nerd-part-1/

    His ideas for an in-camera mono mode and software b&w filters are excellent IMHO. Sigma would do well to read his articles closely.
     
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  2. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Very interesting. Thanks for pointing out these blogs!

    Cheers, Jock
     
  3. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    Very interesting indeed. I'm toying with the idea of playing around with my DP1M as a B&W camera myself.
     
  4. RoyUK

    RoyUK SC Regular

    25
    Jul 30, 2013
    Blackpool UK
    Thanks for the heads-up on these blogs.

    I'm far more a landscape than street guy, so, apart from having to pack a sack full of batteries every time I head for the hills, coping with the quirks of my three DP Merrills is no big deal for me.

    Igor's info on monochrome use was of great interest though and I hope to move more into this field than I have done so far.

    Thanks again

    Roy
     
  5. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    Is there a way to extract the top layer of a Merrill X3F file to monochrome TIFF in batch without going in SPP?
    It would sure make things a lot simpler, but I'm not sure if any of the X3F tools allows this.
     
  6. pdk42

    pdk42 SC Regular

    35
    Apr 4, 2014
    A monochrome DNG raw file would improve the workflow significantly as well as delivering superb b&w images. I really think this is something that Sigma should consider to widen the appeal of the DP cameras.
     
  7. pdh

    pdh SC Legend

    Jan 2, 2011
    there might be.if you can tell me where I can find a merrill x3f to download i can have a quick try of something
     
  8. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    Here you go.
     
  9. Garylh

    Garylh SC Veteran

    Interesting article.. Thanks for sharing.

    Unlike the Merrill cameras, I find the occ jpgs of the Quattro are so good, that one does not need to use spp 6.0.5 except for certain situations.

    With the Sigma dp cameras, I tend to shoot somewhere between 70-90% monochrome mode. The monochrome images from these cameras are some of the best I have ever seen. There was a time I wanted a Leica mm. The dp cameras cured me of that gas attack.

    In monochrome mode, there is a monochrome flag that is updated in the raw file output from the camera. When spp see it, it reverts to monochrome mode operations. However, the camera still writes all the RGB data to the raw file. Thus, it is a simple operation to change everything back to color in spp. In the Merrill the awb is left active in monochrome, in the Quattro they gave turned off awb according to the LCD indicators. Thus, reverting to color, the wb may be at issue.

    Spp has a function to mark color raw to monochrome and vice versa (remove the monochrome flag in the raw file). Once this is done, u can batch convert to tiff in either monochrome or color. Spp 6 seems to have some bugs here right now.

    Gary
     
  10. Garylh

    Garylh SC Veteran

    Are u asking to do a monochrome blue layer (color wheel blue at 100%) only tiff extract?

    Gary
     
  11. pdh

    pdh SC Legend

    Jan 2, 2011
    Ouch!
    that just ate about 20% of my daily bandwidth allowance :smile:
     
  12. grebeman

    grebeman Old Codgers Group

    Jul 13, 2010
    South Brent, south Devon (UK)
    Barrie
    For several days in the spring I shot with my Sigma DP Merrills set to B+W mode and often used a yellow filter. I haven't done a great deal with those sets of images, however these blog articles have inspired me to start examining the images. I often push images a little too far in Silver Efex which in itself adds an element of digital noise to the image. I've just extracted three tiffs of an image using the red, green and blue channels respectively. Using the blue channel image looks to have potential for producing some very "smooth" b+w images, the proof will be in the production of some prints to see if the extra work involved is worth the effort.

    Barrie
     
  13. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    Yes exactly. I know I can do it in SPP without too much fuss, but it'd still be a lot quicker to just run a command in a cmd window and have it extract from every X3F, and then import those to Lightroom.
     
  14. pdh

    pdh SC Legend

    Jan 2, 2011
    Then you need to read up on ImageMagick and install it.

    Which is what I just checked using the downloaded file - it will read the Merrill files OK.

    It's a sophisticated program, and you can certainly extract a channel to make greyscales with it.

    You probably need a combination of the -channel and -separate operators to do so
     
  15. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    Does it convert the raw data or does it extract a channel from the embedded JPEG and save that as a greyscale?
     
  16. pdh

    pdh SC Legend

    Jan 2, 2011
    No idea.
    But given that the whole raison d'etre of IM is to convert raw data, I'd guess that's what it's doing.

    I only mess with it a bit to do my negative inversions when scanning film, and a few other minor tweaks, so you'll have to swing over to the IM site & forums to get more info.
     
  17. grillec

    grillec SC Veteran

    399
    Jan 16, 2014
    Until now SPP and Iridient Developer are the only converters for the x3f files of the Merrills.
     
  18. Garylh

    Garylh SC Veteran

    I looked into it w/ spp 5 to c if I could write a script a long time ago, but from my preliminary look, it did not look like it could handle a cmd line input. If I have time and remember, I c if they changed anything in spp 6.

    Gary
     
  19. Lainer

    Lainer SC Rookie

    24
    Dec 8, 2014
    Arizona
    Thought you guys would like this B&W conversion (Sigma DP2M)

    [​IMG][/url]Joe's Real BBQ by Lainey1, on Flickr[/IMG]
     
  20. Lainer

    Lainer SC Rookie

    24
    Dec 8, 2014
    Arizona
    Another one. (Sigma DP2M)

    [​IMG][/url]Band by Lainey1, on Flickr[/IMG]