[FHPhotographer]

This was with a K100D, 43mm, f/4@1/500', RAW, ISO 200, AF and "daylight" WB. No correction in ACR or PS, just opened and converted to jpeg.

I've not seen this "edge" in a shadow in my images before. Any idea what I did wrong, and how to correct it?

Thanks,
Brian (FHPhotographer)

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Last edited by FHPhotographer; 12-05-2008 at 09:22 PM.

[Alfisti]

I know you mentioned it but is your ACR set to zero or the defaults? The default makes a bunch of changes, you need to make them zero.

Try processing it in penlab and see what happens.

[allill]

I can't help any but if you could figure how to turn that on and off it would be a cool effect.

[Ole]

ACR applies sharpening by default when it converts to jpeg - perhaps that's what causes this effect?

[FHPhotographer]

ACR applies sharpening by default when it converts to jpeg - perhaps that's what causes this effect?

Nope, it's in the RAW image before conversion,
EDIT: sorry, I stand corrected, it isn't a RAW issue after all. Something happened in the conversion to jpg even without implementing any settings. Now I'm just as confused, but about a different subject,Brian

[FHPhotographer]

I know you mentioned it but is your ACR set to zero or the defaults? The default makes a bunch of changes, you need to make them zero.

Try processing it in penlab and see what happens.

I'll try both suggestions, thanks,
Brian

[KungPOW]

You need to buy a Nikon to fix this.

[alohadave]

Check out this blog post to see if it might be an issue with how ACR is handling scaling.

Jao's photo blog: Fixed - bad scaling in ACR/Lightroom

And the original description of the problem

Jao's photo blog: Resize artefacts

[stevebrot]

Hi,
I have seen this "boundary blocking" effect before, but usually in out-of-focus areas of bright colors, never at the shadow boundaries. I have always considered it to be an artifact of the digital image processing in the camera and never suspected the ACR in Lightroom. I will be interested to see if it disappears if the RAW import is zero'ed.

Steve

[stevebrot]

You need to buy a Nikon to fix this.

Nope, I think he needs to buy a Nikon, a Canon and a Leica. Only expenditure of huge amounts of money can overcome this sort of thing... When the greenbacks are gone all artifacts disappear!

Steve

[jct us101]

You need to buy a Nikon to fix this.

I disagree, Canon handles shadows MUCH better.

[qksilver]

that is haloing i think. it happens when you drag the recovery and/or fill light sliders too far in adobe camera raw

[Isaac314]

i think it is CA which has been badly corrected. Originally those borders would have been green or red, but they have been corrected and then failed. its happened to me before when i was using olympus and shooting into the sky.

[falconeye]

that is haloing i think. it happens when you drag the recovery and/or fill light sliders too far in adobe camera raw

This is the (only) correct answer.

Lightroom/ACR has a control called "Lichterkorrektur" in German (I think, it is "Fill Light", the third slider). The "Recovery" slider above can cause this too.

Any of the two sliders first creates a mask around regions which are dark (or bright) and then increases (or decreases) exposure just within the masked region. Unfortunately, this leaves artifacts at the mask boundaries... As you can see.

Therefore, I try to first correct using the level tool further down (which only affects the histogram w/o using a mask). Only if this fails I additionally use the above two sliders.

[Arpe]

Agree. Check your recovery slider, or in the curves, the highlights slider.