A Long Walk

[Ken Watkins]

This Giraffe makes his slow way, in blazing sun, to Okondeka Waterhole, Etosha National Park, Namibia. 28th June 2011.

EOS 1D MkIV

500mm F4 IS hand-held from our vehicle

F8, ISO 320 (:2eyes2:), 1/2500

[Ofer Levy]

Hi Ken, you got the sRGB right! :w3
I see a halo though.

[Rachel Hollander]

Ken - I like the comp with the wide open plains and the birds add to it. I also see a halo, particularly down the back of the neck and back.

TFS,
Rachel

[Ken Watkins]

Any ideas from anyone as to what is going on here, no S/H, no adjustments to blues, NR on BG in layer, no selections using Magic Wand I used same process on my Avian post today yet no halo noticed. Does this only occur with blue?

[Morkel Erasmus]

Nice scene, yet I too see the halo :e3...might be because of some adjustment in RAW conversion, Ken? What do you do with the "recovery" and "fill light" sliders?

[Hilary Hann]

Ken, I've also seen more halos with blue skies but haven't done any research on the why. I wonder if Roger could suggest reasons as he is very up on technical issues. Nice photo.

[Ken Watkins]

Nice scene, yet I too see the halo :e3...might be because of some adjustment in RAW conversion, Ken? What do you do with the "recovery" and "fill light" sliders?

In this image nothing at all was done in converting from RAW, I think I had better send a PM to Roger

[Roger Clark]

Hi Ken,

I got you pm. I see the halo too. What raw converter are you using? I'm using ACR in photoshop CS5 and I have not noticed any halos produced by the raw conversion. I believe the highlight recovery tool works by changing the characteristic curve of an individual pixel in the output image but ignoring the saturated channel. Thus, I have not seen evidence that there is any large radius of pixels involved, only those red, green and blue pixels next to each other. Thus recovery shouldn't produce a halo (at least I've never noticed any).

So if you've not done and selections with contrast adjustments (including levels and curves), nor any shadow highlight tool, I'm at a loss to explain what is causing it. Please give us more info on the work flow.

Roger

[Ken Watkins]

Hi Roger,

The raw was converted in ACR no adjustments made.

As I recall, no adjustments were made using anything other than layers, No shadow highlights, I will start again and see what I can find. Watch this space:bg3:

[Roger Clark]

As I recall, no adjustments were made using anything other than layers,

Hi Ken,

That might be a key. What was done with layers?

Roger

[Ken Watkins]

Here is a repost, is the halo still noticable?

I know colours etc. are not the same so direct comparison is not possible, but is the halo still there?

[Dumay de Boulle]

Prefer the original, the colors are richer the repost is too cool...I see the halo in the original but to me it looks fine. I seem to see halos more regularly on shots against Blue sky...Wish I knew why!

[Harshad Barve]

Very nice image indeed
TFS

[Ken Watkins]

Prefer the original, the colors are richer the repost is too cool...I see the halo in the original but to me it looks fine. I seem to see halos more regularly on shots against Blue sky...Wish I knew why!

Dumay,

The repost was just to see if anybody could stll see the halo, as I tried an updated version during my processing.

I prefer the OP as well, you have to look hard, or at least I do, to pick out the halo.

I have always found this to be a problem with blues.

[Roger Clark]

Here is a repost, is the halo still noticable?

I know colours etc. are not the same so direct comparison is not possible, but is the halo still there?

Hi Ken,

Yes, on my calibrated monitor, I see a halo. It is not as prominent as the original, but still there.

Roger

[Ken Watkins]

Roger,

Thanks I thought it was less, so at least I am getting nearer to finding out what causes it

[Andy Biggs]

Ken, are you using the paintbrush perhaps?

[Ken Watkins]

Andy,

Thanks for the question, but the answer to your question is no. I am still investigating with no real luck so far.