Skip to main content

⚠️ Please note that this topic or post has been archived. The information contained here may no longer be accurate or up-to-date. ⚠️

Anyone else seeing bad Highlights with Leica M10 ?

John Brawley
I'm having a strange issue with C1 working with Leica M10 files.

I've already opened a support ticket, but interested if anyone is having the same issue.

In some situations, when I take a shot that has some close to clipping or near clipping big areas, I get a kind of colour contamination of those transitions areas.

At first I thought maybe it was the camera itself as it's a new model and sensor, but it seems to be C1 related because when I open the files in the current version of LR, the issue isn't there.

Has anyone seen this before ?

Here's a link to my original DNG files and the screenshots of the issue. These are deliberately a little overexposed to try and provoke the issue. I expect that highlights should clip, but they shouldn't be contaminated by a colour like this.

https://drive.google.com/drive/folders/ ... sp=sharing

Thanks !

JB
0

Comments

9 comments

Date Votes
  • SFA
    Slightly pink colouration?

    I sometimes see this with my old Canon 600D, especially when used with a manual lens.

    Oddly I can different results from 2 frames taken a fraction of a second apart on a single shutter press.

    The "bad" image will typically have a significant spike in the red channel right at the white end. Take that out with a tiny levels adjustment and all is well.

    It usually only shows up significantly when attempting some strong exposure adjustment or HDR tweaking which can leave the "peak" exposed.

    I have the occasional shot from Canon S90 and G11 which show a similar sort of effect but much less pronounced and a far rarer event.

    I cannot see a pattern that would help to identify the cause.

    The images in my case do have to be either full blown or right on the edge of any possible hope of recovery.

    I'm not sure if this helps you at all but I offer it for what it is worth.


    Grant
    0
  • Robert Farhi
    Hi JB,

    I have opened two images taken with a M10 Leica (not by me, as I have a M240), and it seems to depend upon the ICC profile and TRC curve I use in the "Base characteristics". I have a slight shift to pink/magenta in highlights when I open the image with M10 generic ICC profile and linear response, but not when the TRC is, for instance, "Auto".
    What are your settings in the "base characteristics" tab ?
    Cheers,
    Robert
    0
  • John Brawley
    Hi Robert.

    I still see the same issue with the "auto" chosen and M10 Generic profile. Yellowish highlights.

    Not something I see in LR.

    Were you able to download the images I linked to ?

    JB
    0
  • Gustavo Ferlizi
    I suspect your lens has excellent infrared transmission (perfect in a monochrome body), and what you're seeing is your red pixels more excited than the blue and green counterparts.

    I can somewhat see that in RawTherapy, with demosaicing set to none.

    Perhaps the banding is due to Capture One's demosaicing algorithm discriminating less than Lightroom's, resulting in this halo in the transition patches.

    Try using an extra IR block filter on the lens and see if it still happens. (or get a monochrome Leica 😜)
    0
  • SFA
    JB,

    The colouring is slightly different but the effect is the same as I described earlier.

    These are the tools that may help.

    White Balance (to set a reasonable starting point).
    Levels (on the red channel)
    Curve for fine tuning.

    Lens tool - light fall off.

    Take care with the HDR tool if used.

    Where possible view the images at 100% to avoid display compression effects.

    I looked at both Linear and Film Standard (Auto) curves with your images and both are OK to use but it looked like there was little to be gained form the DNG file by going Linear.

    Levels and curves adjustments on the red channel are very effective with the two images I downloaded. (2486 and 2836)

    HTH.


    Grant
    0
  • John Brawley
    [quote="SFA" wrote:
    JB,

    The colouring is slightly different but the effect is the same as I described earlier.

    These are the tools that may help.

    White Balance (to set a reasonable starting point).
    Levels (on the red channel)
    Curve for fine tuning.

    Lens tool - light fall off.

    Take care with the HDR tool if used.

    Where possible view the images at 100% to avoid display compression effects.

    I looked at both Linear and Film Standard (Auto) curves with your images and both are OK to use but it looked like there was little to be gained form the DNG file by going Linear.

    Levels and curves adjustments on the red channel are very effective with the two images I downloaded. (2486 and 2836)

    HTH.


    Grant


    Thanks for looking.

    I'm able to "correct" around the issue, I'm just not sure why I have to.

    It's perplexing to me that I need to in the first place. I've taken a look in Raw Therapee, Irident, Darktable and as mentioned Lightroom / PS and none of them by default as bad as C1. Even when I really try hard with overly aggressive highlight recovery, it still doesn't looka s bad as the default in C1. I think there must be something up with the way C1 is seeing this file or maybe my camera's RGB balance / calibration in the high end that only C1 is seeing...

    JB
    0
  • Gustavo Ferlizi
    I'm serious. It's probably worth looking into an extra IR filter if you plan on shooting extreme contrast wide open with a Leica lens.
    Test before buying of course.
    0
  • Robert Farhi
    [quote="NNN635129035970191014" wrote:
    Hi Robert.

    I still see the same issue with the "auto" chosen and M10 Generic profile. Yellowish highlights.

    Not something I see in LR.

    Were you able to download the images I linked to ?

    JB


    Hi JB,

    I have downloaded your images 12468 and 12851. The effect is not so serious when using the non linear curves (auto, extra shadow, high contrast,...) proposed by Phase One in the menu, but is very important when using the "Linear response" curve, which seems to me obvious, as that curve needs more careful and severe adjustments before getting good (and even better) results.
    I wonder if Phase One will improve its M10 generic profile, as it is by now only preliminary. This could maybe solve the issue ?
    0
  • SFA
    [quote="tenmangu81" wrote:
    [quote="NNN635129035970191014" wrote:
    Hi Robert.

    I still see the same issue with the "auto" chosen and M10 Generic profile. Yellowish highlights.

    Not something I see in LR.

    Were you able to download the images I linked to ?

    JB


    Hi JB,

    I have downloaded your images 12468 and 12851. The effect is not so serious when using the non linear curves (auto, extra shadow, high contrast,...) proposed by Phase One in the menu, but is very important when using the "Linear response" curve, which seems to me obvious, as that curve needs more careful and severe adjustments before getting good (and even better) results.
    I wonder if Phase One will improve its M10 generic profile, as it is by now only preliminary. This could maybe solve the issue ?


    True, so long as people do not then complain about too much clipping being applied and lost detail in the highlights!

    I think the "Film Standard" curve (almost always the curve selected as "Auto") offers quite an optimal staring point for regular editing work in typical images but to have full control from the start Linear may be a preferred option.

    Or, of course, a curve one has developed oneself and saved as a style.

    My previous investigations about this phenomenon suggest that the problem exists only at the extreme end of attempted adjustment for high or over exposure in some hardware combinations. Whether correction for that can be (or even should be) part of the requirement for a generic assessment for adjustments to be applied is probably open to "polarised opinion" debate. Realistically one might point to using an alternative default curve - perhaps and "extreme highlights" version of something that is already offered?


    Grant
    0

Post is closed for comments.

Didn't find what you were looking for?

New post