What are these red marks in the leaves, K10D? - Page 2

*J.Scott* · 06-07-2007, 05:39 AM

BTW...how is Canada doing this morning with Anaheim winning the Stanley Cup?

Lots of long faces here. We've been 'ducked' for the cup! Aw well - thanks to selective short term memory (by sports media types) it will all be forgotten in a few days.

Gimbal · 06-07-2007, 01:50 PM

It’s obviously not phantom pixels, at least they are not even remotely similar to those I’ve read about.

@Jonas, it’s ACR and it’s an AMD, and it’s seems to be something hitting the limits in an ugly way. But an incompatible instructions set? I don’t know…

Jonas B · 06-07-2007, 02:58 PM

Originally Posted by Gimbal

It’s obviously not phantom pixels, at least they are not even remotely similar to those I’ve read about.

@Jonas, it’s ACR and it’s an AMD, and it’s seems to be something hitting the limits in an ugly way. But an incompatible instructions set? I don’t know…

I don't believe in phantom pixels either, let's leave - those are artefacts of another kind.

I guessed ACR + AMD as this has been discussed earlier over at DPR. AMD processors of a certain age doesn't have the instruction set ACR works with and overexposed flowers (in the example discussed) got weird colors in the blown areas. I didn't try to memorize the details so I can't add anything further to this at the moment.

kenyee · 06-07-2007, 07:28 PM

Jonas: I actually remember this as well. It was wayyy back. If Gimbal and WildSioux are both running old AMD processors, I think that's the problem :-)

Hah. Remembered where to look for it at least and dpreview's search function is up for once :-)
Re: here is mine...: Pentax SLR Talk Forum: Digital Photography Review

Problem seems to be AMD processors that don't support SSE2, so older Athlons. Adobe supposedly fixed this in ACR4.1. The sample images they posted look similar...the weird highlights are green from math overflow...

stewart_photo · 06-07-2007, 10:02 PM

Originally Posted by WildSioux

Hmm, interesting observations LOL. No, there isn't a dealership behind the trees. This was at my grandparents house in the front yard and behind the tree is their neighbors house that is next to them.

Well, if you're certain there isn't anything in the original scene, I don't have a clue what it could be. So far, I haven't seen anything like this in any of my images, but that obviously doesn't have any bearing on you or your situation. Hopefully it is an isolated incident.

stewart

WildSioux · 06-08-2007, 12:49 AM

Originally Posted by kenyee

Jonas: I actually remember this as well. It was wayyy back. If Gimbal and WildSioux are both running old AMD processors, I think that's the problem :-)

Nope, my computer(s) all have Pentium processors. The computer I used for this photo set was on a Pentium 4 2.4 that is about 4 years old.

Originally Posted by stewart_photo

Well, if you're certain there isn't anything in the original scene, I don't have a clue what it could be. So far, I haven't seen anything like this in any of my images, but that obviously doesn't have any bearing on you or your situation. Hopefully it is an isolated incident.

stewart

I am positive, don't you think that I would know what is around my grandparents house? Geez, its like everyone here thinks I don't know what is near and this is from something behind the leaves. If you look close, the marks are superimposed on the leaves.

This is either a problem with the way Silkypix processes photos. Or it is a glitch in the K10D. I am hoping the former. I will have a chance this weekend to do some more shots like this.

Gimbal · 06-08-2007, 02:05 AM

I waded through the entire dp-thread. Lots of noise there, but it seems you (Jonas) where right regarding my case. Almost unbelievable that such a problem still exists, I mean the different versions of SSE aren’t exactly new stuff and one figure the problem should have been ironed out in the math libraries a long time ago. Anyhow, it’s nice to know it’s a software problem in a certain version of ACR.

Jonas B · 06-08-2007, 02:52 AM

Originally Posted by Gimbal

I waded through the entire dp-thread. Lots of noise there, but it seems you (Jonas) where right regarding my case. Almost unbelievable that such a problem still exists, I mean the different versions of SSE aren’t exactly new stuff and one figure the problem should have been ironed out in the math libraries a long time ago. Anyhow, it’s nice to know it’s a software problem in a certain version of ACR.

Thank you for confirming. Yes, it is a bit crazy. Anyway, as you say, it's good to have a known reason. But WildSioux's problem seem to be something else.

regards,

kenyee · 06-08-2007, 06:27 PM

Originally Posted by WildSioux

Nope, my computer(s) all have Pentium processors. The computer I used for this photo set was on a Pentium 4 2.4 that is about 4 years old.

Just for yucks, can you install Silkypix on another computer (be sure to note what kind of processor it has) and try processing the RAW file again? It really does look like this is your issue as well, but it should be on an AMD processor. Maybe it's just on processors w/ the SSE instructions.

kmccanta · 06-08-2007, 11:21 PM

To me it looks like a flag.

I even think I see part of the flag pole.

-k

vizjerei · 06-11-2007, 07:15 PM

oh today I take RAW picture of the sunset behind my backyard, when i go to Photoship and try push up the exposure, then I see those red marks and stuff.. just wondering if it is the same to what happen to your pics

WildSioux · 06-12-2007, 02:13 PM

Originally Posted by vizjerei

oh today I take RAW picture of the sunset behind my backyard, when i go to Photoship and try push up the exposure, then I see those red marks and stuff.. just wondering if it is the same to what happen to your pics

Are you able to post a picture of it? My guess is that it is a new marketing scheme by Pentax to introduce red artifacts into our photos and to trick us into believing that they are simply illusions of car dealership signs, flag poles, and other such things.

stewart_photo · 06-12-2007, 08:36 PM

Originally Posted by WildSioux

I am positive, don't you think that I would know what is around my grandparents house? Geez, its like everyone here thinks I don't know what is near and this is from something behind the leaves.

No need to get angry. I didn't know it was your grandparents house and I doubt many of the others here did either. You posted an image and asked what we thought the strange colors in that image were. You gave no further useful imformation, such as levels of cropping, enlargement, editing details, etc. Lacking that information, we gave our honest initial impressions - looks like objects behind the trees.

If you look close, the marks are superimposed on the leaves.

Yes. And, as suggested earlier, there are several ways that could happen, included colors bled onto the leaves from from objects behind during editing, compression, and so on.

You have now provided more information and ruled out the possibility of objects behind the trees. As stated earlier, I now don't have a clue what it could be and will bow out of the discussion. Good luck with whatever solution you do eventually find.

stewart

WildSioux · 06-13-2007, 11:43 AM

Originally Posted by stewart_photo

No need to get angry.

Sorry if I came across as being angry. It is hard to say something with sarcasm on the internet without sounding rude.

Good luck with whatever solution you do eventually find.

stewart

Well, the solution I have for these photos are to take the "Color Correction" tool in photo shop and click on the green area near the red spots and just paint over them. This turns out well and can hardly tell they were ever there.

As far as why this happens. My guess is as good as any body's else's guess.

walsh · 06-23-2007, 01:35 PM

Originally Posted by WildSioux

First, if this is in the wrong forum then please move.

This is a crop from a photo I took of my family in a group shot this past weekend at my cousins wedding. I realize this was shot into the sun and despite that, the group was in the shade and the photo turned out good otherwise. K10D with Sigma 24-135 lens. I am surprised that there is very little to no purple fringing in the leaves.

Since this was of my family all together I decided to shoot it in RAW+Jpeg. I processed all of the photos in Silkypix 3.0 and saved over the Jpegs from the camera. So I have no idea if the in camera jpegs had these same red marks. I am willing to bet that they are there. And yes, they are even in the RAW photos when opened up in Silkypix backing up my belief that the in camera jpegs had them too. All 10 of them have these marks.

After looking at these photos more, I now notice some blue marks up towards the top.

This is obviously not purple fringing. Is there a defect with my camera? Or is this a flaw with the K10D? I have seen other threads like this on DPReview but didn't give it much thought since I have never experienced it.

Check your camera saturation, contrast settings, I tried increasing mine on a couple of 'green leave' shots and I got a similar blotching - reducing back to midpoint got rid of them.