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Desaturated/ Gray Strip on Image After Export

mfpshmoo
Not really sure how to describe this except to show each screenshot

In C1 in capture folder

https://drive.google.com/open?id=1BqSns ... gjqd3auJRQ

Exported with adjustments as JPG

https://drive.google.com/open?id=1WMogO ... wGl24wTa6R

Exported without adjustments as JPG

https://drive.google.com/open?id=1GKoOT ... BMS6VRQ-Zr

I exported the original to see what would happen which resulted in this:

Exported as Original (NEF) Thumbnail in Coverflow

https://drive.google.com/open?id=103Cty ... MPCtJIoTzx

Original Expanded preview

https://drive.google.com/open?id=1mSrxv ... Muazc-EynE

Have never had anything like this come up before. Did some digging online with no luck. sRGB export
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Kommentare

8 Kommentare

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  • SFA
    Your links are private so I don't think people will have a way to see the evidence.


    Grant
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  • mfpshmoo
    Thanks for the catch Grant. Some were broken for some reason. Relinked them so they should be fine.
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  • SFA
    Interesting. I could not open them in Firefox except as a Private Window. Then it worked fine.

    As for the problem, what level of compression are you using for the jpg output?

    The problem area (and there is a hint of a similar problem just under the armpit) looks like some sort of combination of moiré and compression on the sharpest areas of the fabric.

    So firstly it would be interesting to know what happens if you create an output with no compression but jpg and then another as a tiff. Try full size as well as smaller sizes to see if and how they are different.

    You could also try the Moiré tool adjustment but that would seem to be an odd things to consider - it may be an influence though.

    Finally, but this is really something that usually only matters if you are seeing random and completely irrational artefacts on parts of an image, you could try turning OFF Hardware Acceleration in the Preferences. Just as a temporary experiment to see if anything changes when processed again with settings that have previously failed.

    If you zoom right in to the images you can see the problem sections are extremely pixellated compared to the rest of the shirt area which is almost de-focused in many places.

    In fact the whole shirt seems to present a strange mix of very sharp and very "soft" areas of fabric even from what I think was the NEF file directly - although if that was the RAW file thumbnail it would be less of a surprise.

    (The links seem to have stopped working for me even as Private Windows an although I have some of them open I can't recall which are which.)

    It would be interesting to hear from someone with, perhaps, fashion shooting experience who may have seen similar results at some point.

    I have seen occasional small areas of images that looked somewhat similar when viewed large on screen but never anything quite like this as far as I recall.

    HTH.


    Grant
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  • mfpshmoo
    [quote="SFA" wrote:
    So firstly it would be interesting to know what happens if you create an output with no compression but jpg and then another as a tiff. Try full size as well as smaller sizes to see if and how they are different.

    You could also try the Moiré tool adjustment but that would seem to be an odd things to consider - it may be an influence though.

    Finally, but this is really something that usually only matters if you are seeing random and completely irrational artefacts on parts of an image, you could try turning OFF Hardware Acceleration in the Preferences. Just as a temporary experiment to see if anything changes when processed again with settings that have previously failed.


    I have no idea whats going on with those links. Seemed fine when I tested them not signed into Google on Safari. I am sorry about that. I am new to this forum but is it me or can you only have links but not actual photos in posts?

    I had tried tiff before to see if that would change anything but no dice. I am always exporting at 100% quality. Did drop the jpg quality down to 5% with no difference. Moire and changing the accelerator didn't make much of a difference either.


    [quote="SFA" wrote:
    In fact the whole shirt seems to present a strange mix of very sharp and very "soft" areas of fabric even from what I think was the NEF file directly - although if that was the RAW file thumbnail it would be less of a surprise.
    .

    I thought initially maybe the fabric had something to do with it or some combination of a lot of things I was shooting at f/7 but thats not out of the ordinary for me with the kind of head shots I do for certain clients and I have taken a lot of heads with a similar set up never came across something like this.

    Whole thing seems really odd but I am sure there is some reasonable explanation.
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  • SFA
    Well, I just tried one of the links again and although they stopped linking yesterday I can now once again open in a Private Window.

    Who knows what odd things happen on the internet? No matter so long as they work well enough often enough to see the problem being illustrated!

    No you can't upload an image file as far as I know but you can, in theory, link to an image but only directly to a recognisable image file and not a link to an image.

    I can understand why Phase might be less than keen to take on responsibility for file storage.

    OK, 100% quality but also full file size?

    You're right, it is really odd.

    I would be happy to take a look and see what happens processing the file on my installation but that might no be something you feel it would be appropriate to do.

    I would suggest creating a Support Case and asking the C1 support team to offer some suggestions.

    I looks just like a moire effect to me but the extent and scale seems odd - something very specific.

    I've seems something slightly similar with herringbone patterned material (so similar) but it was a long time ago and nothing like as extensive as your example.

    Sorry I can't help more.


    Grant
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  • OddS.
    [quote="mfpshmoo" wrote:
    ...I thought initially maybe the fabri


    I can not access your images so the following may not be relevant in your case at all.

    There is a recent thread "What is this pattern" over at the Cambridge in Color forums https://www.cambridgeincolour.com/forum ... d62869.htm Guesses seem to circle around specific sharpening settings in Adobe software and possibly the pixel rearrangement done to correct/compensate lens distortion, perhaps a combination.

    You could possibly try with no lens correction and no sharpening applied to see if the artifacts change.
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  • SFA
    Odd,

    One of the samples is a straight view of the NEF file (presumably the embedded jpeg is what can be seen) and that also has an evident slight light grey strip in the material of a shirt although not the processed file's extreme moire look. No processing applied.

    In that example, to me at least, things don't look quite right.

    In the processed examples the same areas of the image look very wrong. But I suspect that is simply a relatively small amplification of the original strange area of a blue shirt with a distinct weave in the material which, seen at quite low screen resolution compare to the RAW file resolution after processing turns into something more dramatic in appearance.

    However, right now that is speculation from me and there is more to be done to assess exactly what is happening with the images under discussion.

    Bear in mind also that we are looking at on-screen issues at the moment.


    Grant
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  • mfpshmoo
    [quote="OddS" wrote:
    [quote="mfpshmoo" wrote:
    ...I thought initially maybe the fabri


    You could possibly try with no lens correction and no sharpening applied to see if the artifacts change.


    A straight export without adjustments results in the same effect.

    [quote="SFA" wrote:

    I would suggest creating a Support Case and asking the C1 support team to offer some suggestions.


    Not really sure why I did not think of doing this before but I ran the NEF through photoshop and it came out fine. Mystery continues but its always good to have a backup option. I am going to send it over to the support team.
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