• Members 216 posts
    April 14, 2023, 7:48 a.m.

    No what is you baseline exposure for that make of camera and what processing is being done that is hidden you in the raw conversion.
    WB correction is only being added to the blue and the red

  • Members 3934 posts
    April 14, 2023, 8:03 a.m.

    If RawDigger is not accurate as you say, then what should have RawDigger displayed?

  • Members 3934 posts
    April 14, 2023, 8:13 a.m.

    Without having the actual raw file I cannot say what is happening.

    What I can say from the raw histogram is that the greens are about 2.5 stops underexposed assuming 16000 is the clipping point for 14 bit data.

    The reds are nearly 4 stops underexposed and the blues are 3 and bit stops underexposed.

    So based on my previous post you could have safely added 2 stops of exposure* than what you actually did for the shot the raw histogram is related to without clipping the raw data. Now of course the camera's histogram would have shown significant clipping if you added 2 stops of exposure* but the actual raw data would not have been clipped.

    If you had added that 2 stops of exposure* and then opened the raw file in ACR and lowered the image lightness by 2 stops using the 'exposure' slider then the resultant image would have less visible noise than the original image where you did not add that 2 extra stops of exposure*

  • Members 216 posts
    April 14, 2023, 8:14 a.m.

    here is the brightest portion of your scene found within that raw file after we have corrected for the BLE and other processing done behind the scene by ACR while still using your in camera WB setting
    photos.smugmug.com/Temp/Temp/i-CrSpMwg/0/6ee95c8c/O/asdfewwerr.jpg

    No what you are seeing is the hidden processing done by your raw converter
    photos.smugmug.com/Temp/Temp/i-s2VvkS5/0/617f13ca/O/sfsdfwerfwer.jpg
    At the top of this grab is the histogram of the image in PS with the selected area, this raw has been converted for the in camera WB but with the hidden ACR process and BLE removed. The grab bellow is the raw histogram from RD notice how the green channels of the top and bottom fall very similar from the right

    So what is showing you the incorrect data the RD or how ACR is processing the image
    Stop and think about it if all I have done is removed the BLE and some of the processing done by the ACR hidden to you and they show similar results how can ACR be used to aid you as to how your camera should be setup if this hidden processing is not known to you in the first place?

  • Members 2305 posts
    April 14, 2023, 8:22 a.m.

    this is quite funny as i post a neutral grey and you post red 🤨😵‍💫 weird if you ask me.

  • Members 2305 posts
    April 14, 2023, 8:24 a.m.

    tell me what settings need to be changed on my camera given you have the raw file ?

  • Members 216 posts
    April 14, 2023, 8:30 a.m.
  • Members 2305 posts
    April 14, 2023, 8:30 a.m.

    this image is not 4 stops underexposed it is perfectly exposed. it has basically no adjustments.
    elouise02web.jpg

    elouise02web.jpg

    JPG, 3.1 MB, uploaded by DonaldB on April 14, 2023.

  • Members 216 posts
    April 14, 2023, 8:35 a.m.

    Colors can be clipped outside of neutral or something that is not white weird that you don't know this

    And you do realize that what your are trying to show is nothing more than where a color falls within a values of 0,0,0 to 255,255,255 in a given color space and not what is contained within a raw file

  • Members 216 posts
    April 14, 2023, 8:38 a.m.

    Other than the hidden adjustments being done without you know so then yes, but if you use RD you would know what adjustments are being done without your knowledge.

  • Members 2305 posts
    April 14, 2023, 8:39 a.m.

    this shows "0"EV can you not see that ?
    eloise crop.jpg

    eloise crop.jpg

    JPG, 26.5 KB, uploaded by DonaldB on April 14, 2023.

  • Members 92 posts
    April 14, 2023, 8:42 a.m.

    Has anyone considered that this may be a wind up? Lots of it in DPReview forums, perhaps it has migrated here. If it is not then I apologise to the OP. Ken

  • Members 2305 posts
    April 14, 2023, 8:44 a.m.

    Hi Ken what does EV mean ?

  • Members 2305 posts
    April 14, 2023, 8:54 a.m.

    I am so over this, everyone do yourself a favour and read this.

    www.dpreview.com/articles/6641165460/ettr-exposed

  • Members 216 posts
    April 14, 2023, 9:14 a.m.

    Yup maybe you should
    "Rather generally, RawDigger is a very useful resource for gaining meaningful information in relation to shooting ETTR. With RawDigger you can see the actual raw histograms and see exactly how closely you have achieved ETTR."

    "White balance also affects the histograms, sometimes resulting in a story that differs greatly from that of the underlying raw-data histograms and therefore potentially providing misleading information for ETTR."

    Yup covered it here

    dprevived.com/t/raw-histogram-and-why-does-it-matter/1848/post/14901/

    "The amount of highlight headroom varies from camera to camera, and you will have to experiment with your camera to determine whether you have 2-2/3, 3, or even more EV of headroom. You can determine this amount quite accurately by using software like Rawdigger"

    Yup covered it again here

    dprevived.com/t/raw-histogram-and-why-does-it-matter/1848/post/14901/

    This is what is hidden to you with the raw converters with the BLE and other processing
    and the last quote

    "And it provides accurate feedback about the efficacy of your ETTR techniques. It is, therefore, highly recommended software for any raw shooter wanting to perfect using ETTR."
    I have and others have been saying this all along

    I don't think you even read what you linked to
    and certainly not anything people have been telling you here

  • Members 2305 posts
    April 14, 2023, 9:24 a.m.

    conclusion: thanks for the discussion but needed to know how good my studio exposures were using another program.
    I will not be adjusting my work flow because my images show "PERFECT EXPOSURE" using the in camera A74 histogram.
    If you want to debate it further then dont include me. as im now brain dead after a record 230 posts 😵‍💫😵‍💫😵‍💫

    elouise02web.jpg

    scaled rae digger histo.jpg

    my go to histogram fast stone.
    faststone.jpg

    faststone.jpg

    JPG, 101.1 KB, uploaded by DonaldB on April 14, 2023.

    elouise02web.jpg

    JPG, 3.1 MB, uploaded by DonaldB on April 14, 2023.

    scaled rae digger histo.jpg

    JPG, 344.3 KB, uploaded by DonaldB on April 14, 2023.

  • April 14, 2023, 9:36 a.m.

    The combination of f-number and exposure time expressed logarithmically to base 2. What you probably think of as 'EV' is properly EV₁₀₀ , which is the scene luminance which gives nominal (target) exposure with the given EV setting. It's an alternative to the correct SI unit, the lux, which in my view is preferable.

  • Members 2305 posts
    April 14, 2023, 9:48 a.m.

    yes i was referring ev on the raw digger histogram as the figure "0" and after reading the info on there site and at DPR i was right as the histogram is in Photographic mode. or whatever it is.
    eloise crop.jpg

    eloise crop.jpg

    JPG, 26.5 KB, uploaded by DonaldB on April 14, 2023.