Red edges to Sparkles from EOS 20D

[POP]

Probably the result of the nasty clipping.  It can be fixed at the cost of some major desaturation (my first play with the targetted saturation tool in Lightroom), but the chromatic aberation tools in LR didn't do much.

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I just noticed your attached file Tim, thanks for the effort!  I agree about the desaturation, and in the crop, or even with the whole image it is tempting to do that (not that the particular image is likely to be used for anything, but it does exhibit the purple fringing especially well), even if the desaturation were masked down to the locale of the PF itself, and something that I will bear in mind for the future, but I am also interested in understanding the effect better in the hope that it may reveal some solution available within my existing workflow.

As for the CA adjustment, I found that since it is not CA, trying to remove it with CA adjustment just created more of a multi coloured effect, which was not satisfactory at all hehe.

Cheers
Peter
[a href=\"http://www.pictures-of-paradise.com]Pictures of Paradise[/url]

[John.Murray]

I agree with others, the original exposure is blown - here is acr4(from cs3 beta)screenshot:

[POP]

I agree with others, the original exposure is blown - here is acr4(from cs3 beta)screenshot:
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There is no doubt in anyones mind I think that the image is blown, it is absolutely blown Joh, but from my experience many pictures endure being blown without suffering purple fringing.

Very interesting seeing the screenshot of CS3 though!  It shows a lot of new sliders there, I am curious whether the new ones are a new way of doing the same things with the old sliders?  Also I am wondering why the WB is stated as being 'Tungsten'?

Peter
[a href=\"http://www.pictures-of-paradise.com]Pictures of Paradise[/url]

[John.Murray]

pop:

i open the first link directly into Photoshop 3 with no changes (I doubled checked  )

ACR4 settings are basically identical to Import/Develop features of Lightroom 1.0, just a different UI

I love the image btw

[POP]

pop:

i open the first link directly into Photoshop 3 with no changes (I doubled checked  )

ACR4 settings are basically identical to Import/Develop features of Lightroom 1.0, just a different UI

I love the image btw
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I just checked, the version I have here is identical except the WB is 'As Shot' and Temp is 5450, Tint +5, strange but not so important i guess...

The picture is from a place called Paekakariki in New Zealand.  Every time I am there I am blown away by the majesty of the view, and this was another attempt to catch it.  I intend making a panorama of 4 pictures, the far left one being this:

Peter
[a href=\"http://www.pictures-of-paradise.com]Pictures of Paradise[/url]

[John Sheehy]

Don, I tried the upload link but I got a page that said there was a problem    try right clicking this link and downloading it to your HDD:
115526_Sunlight_reflected_from_the_sea_-_Paekak_hilltop_(40mm).dng
(I dont normally have understrokes in my file names but for the purposes of transfer I have included them)

John, it is great to read your break down of the problem and it rings true for the example included.  I guess when you have pin point lights in a night time scene it would be the CCD sensor bloom?
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The 20D's CMOS sensor does not bloom.  Purple/magenta edges around pinpoint lights are most likely OOF IR with a 20D.

Take a shot of the heating element in a toaster or toaster oven, manually focused.  Note the sharpness of the coil.  Then, put on an IR pass filter and take it again, focus unchanged.  You will have an OOF purple/magenta coil.

[dlashier]

Don, I tried the upload link but I got a page that said there was a problem   Pictures of Paradise
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Peter, my system probably didn't like the gawd-awful long filename. I've dl'd from your link and will try it in C1 tonight.

Edit: looked at the error log and it was the unmatched quote (apostrophe) you put in the description. Oversight on my part as I should encode this input.

- DL

[POP]

Peter, my system probably didn't like the gawd-awful long filename. I've dl'd from your link and will try it in C1 tonight.

Edit: looked at the error log and it was the unmatched quote (apostrophe) you put in the description. Oversight on my part as I should encode this input.

- DL
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     The 'gawd-awful long filename' is an attempt to keep myself at least semi aware of what is in all my files, you think it's gawd-awful, you wanna (not) try naming them all, it really is a chore, but I press on valiantly (thick headedly) trying to ignore that I am up to my armpits in these files, and they increase in number daily...

I got no email telling me that you had posted a comment here Don, but I just came to say thanks to everyone for helping me and that you have all made me feel quite honoured to have recieved your help!  I see I have had a big influx of traffic at my website aswell, which is nice, and I hope it was enjoyable to visit

Anyway I'm looking forward to your conclusions Don.  Btw your picture of Yake-Me is just wonderful, the way he holds himself is there to see, and very special!  I dont know who he is but I think he is a great man. You moved me and that is what it is all about I believe.

Peter
[a href=\"http://www.pictures-of-paradise.com]Pictures of Paradise[/url]

[dlashier]

Anyway I'm looking forward to your conclusions Don.  Btw your picture of Yake-Me is just wonderful, the way he holds himself is there to see, and very special!  I dont know who he is but I think he is a great man. You moved me and that is what it is all about I believe.

Peter
Pictures of Paradise
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Thanks Peter, Yake-Me is one of my personal favorites also. Believe it or not this was taken handheld from about 75 feet from the dancer on stage, ISO 200 (because 1D is not good at high ISO). Fortunately it was a slow dance. Also note that he "squinted" throughout the dance - wasn't just bad timing.

re your image, I finally found time tonight to check it out but for some reason C1 will not open the DNG even though it opens other DNGs like Leica M8's just fine. Can you upload or post the original raw file? (just leave any ' out of the description).

- Don

[POP]

Don, did you mean ' as in apostrophe? I am sure there are none in the name   Sometimes when I upload files they get corrupted but I checked that before linking them and they seemed fine, darn finicky things these computers    

115526_Sunlight_reflected_from_the_sea_-_Paekak_hilltop_(40mm).CR2
115526_Sunlight_reflected_from_the_sea_-_Paekak_hilltop_(40mm).xmp
Here we go; there's the CR2 file and its sidecar XMP file.

This would make it third time lucky wouldn't it?

All the best
Peter
Pictures of Paradise

[pminicucci]

Peter: Since you listed the CR2, I thought I'd try DxO to "cure" the purple fringing/IF OOF issue. Here's the result:



This is a 100% crop, at native resolution, using ACR's 20D defaults (no other adjustments). Did a pretty decent job, I think.

[POP]

Pat, the image looks great!  I think I am satisfied where the PF is coming from now.

I have downloaded a trial copy of DxO and it seems pretty wizzy i must say.  A program that creates so many files and projects etc disturbs me though, like Bridge and Version Cue does.  I'm sure that all the projects and files would be useful for someone, but I always thought it nice to have one file per picture (2 at the most).  Just a gripe about over complex things that store important information in places I dont know about and dont understand...

Perhaps in the future I will think about buying another Raw converter, but for the time being I cannot justify the expense for the few images that need the extra attention.

Thanks to all poster's for your input and effort, you have all been most informative  

Cheery O
Peter
Pictures of Paradise

[POP]

When I look at images now, i see how 'blunt' an instrument ACR is!  It is relatively easy to learn and to use, but seems lacking somehow.  Perhaps later versions will be better, but that is the 'catch phrase' of computers isn't it, as the intent of the computer gets more and more sopisticated and complex, all the 'tools' needed to work with the intent become more sophisticated and complex, and more expensive     It drives me crazy  

Having another play and a read of the DxO's help file impresses me more and more, it is very full featured, and moderately userfriendly.  Well I know that if I want to do better justice to my cameras pictures that seems to be the way to go.

Just adding some more detail to my thoughts while this topic is still top of the que, that's it now though  

Peter
Pictures of Paradise

[John Sheehy]

When I look at images now, i see how 'blunt' an instrument ACR is!  It is relatively easy to learn and to use, but seems lacking somehow.  Perhaps later versions will be better, but that is the 'catch phrase' of computers isn't it, as the intent of the computer gets more and more sopisticated and complex, all the 'tools' needed to work with the intent become more sophisticated and complex, and more expensive     It drives me crazy   
Pictures of Paradise
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What RAW converters need is a plug-in system, to alter the files before the converter does its unique thing.  Each converter has its strengths and weaknesses.  ACR might be the best for removing horizontal banding in images; it removes/interpolates hot and dead pixels, etc, but there are a few things it still doesn't do well, like reject chroma information at extremely-high contrast edges in the demosaicing algorithm.

I looked at your DNGs in the RAW state, and it is a little difficult with the color moire and over-exposure, but it seems that even where the sparkles are not clipping the RAW data, the edge pixels tend to be mostly blue and red, and very little green, reinforcing my OOF IR idea.  This could have been verified with an under-exposure, which would probably be about 3 stops darker to keep the sparkles (or at least some of them) from clipping.  Fortunately, even if converters don't address the IR issue per se, some may address CCD blooming, which has similar end results, like DxO (Or they may be aware of both problems).  A filter that simply avoids hi-res color around high-contrast edges in general probably helps, too.