pink clouds :(

sturisoma

sturisoma

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not sure where to put this so please move it if it's in the wrong place

I got a new lens last week and had my first chance to play in the sunshine today.

I have attached some images where you can clearly see pink clouds. Seems to be where the image was blown.

oddly one image taken immediately after the other had no pink.

these were all taken in RAW.

when viewed in PSP (camera RAW) there was no sign of the pink. But when viewed in windows preview or picasa the pink was evident. (sometimes I view cr2 in picasa or reviewer because it is much quicker to sort through and delete the gash)

I am wondering - could this be a poor quality (secondhand) lens? Should I take it back? I have had this happen only once before with my current camera and I put that down to a poor quality CF card.

thanks in advance

PS the last image was viewed in camera raw and saved as a jpeg - the others were all viewed in picasa and the forum converted them to jpeg in the upload
 
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That has nothing to do with the lens. It's how the the processing has dealt with the blown highlights.... and blown highlights is metering error.. as in user error, not a faulty meter. It's certainly not a lens defect. There's no way a lens could make your blown highlights pink. By default, a blown highlight is white, as you've saturated the sensor. It has to be a processing issue.
 
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hmmm, two points though, why has it happened only with this lens and why does it only show in picasa et al and not camera raw. oooo 3rd point, why are only some of the batch effected? If not the lens then it must be a combination of camera sensor and viewing software. I'd love to know the actual technical reason for it..
 
sturisoma said:
and why does it only show in picasa et al and not camera raw.
Click to expand...

This would be where I'd be looking.

You also mentioned a poor quality CF card, and that can't cause this either. A CF card is just digital storage, it can't affect the quality of the image. It either works, or not.

There's no way the lens can cause this. This is something to do with picassa if it only happens in picassa. It's clearly only doing this on blown highlights, or areas of very bright highlights.

Can you post up a link to where I can download the RAW file to "test.jpg? That seems to be the worst affected file. I'll take a look and see if there's anything unusual about it.


However.... it's either a problem with Picassa, or a problem with the camera, but a lens can not make your highlights pink in itself. If Picassa is making blown highlights pink, then maybe you are over exposing more with this lens.


How was it shot? What metering mode was used?
 
I would say it's definitely Picasa... I upload and view in Picasa before moving them to Lightroom, as it's easier for deleting....
And Picasa does tend to alter the colours when uploading RAW files, which all look fine in Photoshop or Lightroom...
 
I had exactly this - I sent a couple of photos to be printed three or so years ago and they came back with pink skies. Once I calibrated my monitor I found that some other early photos had them too, but having my monitor too bright had meant I couldn't see them. Now I am more experienced it no longer happens, but it is, as mentioned above, just blown highlights.
 
Hi David

I will stick it on Flickr when I get home. I am relieved it's not the lens or the camera, but you know how it is - new lens, pink clouds, conclusions to jump to lol. I could understand it being everything that you guys said, except for the 2nd image not having pink clouds - although it is still clearly blown. I will still use Picasa for quick viewing, but I won't trust its interpretation of RAW files :)
 
sturisoma said:
Hi David

I will stick it on Flickr when I get home. I am relieved it's not the lens or the camera, but you know how it is - new lens, pink clouds, conclusions to jump to lol. I could understand it being everything that you guys said, except for the 2nd image not having pink clouds - although it is still clearly blown. I will still use Picasa for quick viewing, but I won't trust its interpretation of RAW files :)
Click to expand...

If you Google "picasa pink blown highlights", you'll find a lot of people having the same issue. I didn't see a solution from a quick scan of the first page of results.
 
sturisoma said:
I will still use Picasa for quick viewing, but I won't trust its interpretation of RAW files
Click to expand...

I encountered this not long ago when I was trying out the Photo Mate R2 app for Android, though they seem to have fixed it now.

It's ISO dependent and appears in recovered highlights of images processed with software that is based on DCRaw - such as PMR2, UFRaw and Picasa. It's been an issue for at least five years as I experienced it when the 450D was current (2008-2009) but didn't understand why at the time. It's something to do with the coding of the saturation point, I think it was that it's done per-camera when it needs to be per-ISO.
Adobe software doesn't use DCRaw so it doesn't exhibit the problem.

On a Canon 40D ISO settings 100, 160, 320, 640 and 1250 result in this problem for me. On a 7D it's 100, 125, 160, 320, 640, 1250 and 2500.

Edit: Added 7D ISO settings.
 
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sturisoma said:
Hi David

I will stick it on Flickr when I get home.
Click to expand...

You can't put RAW files in Flickr. I was wondering if you could host the actual RAW file.

Anyway... I'm almost certain this is an issue with Picassa. Just stop using Picassa, as others have said.. if it's a known issue they're not addressing, then time to move on perhaps.
 
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I've seen this happen on a DPI of a cathedral interior pp in photoshop CS5. It looked fine on the PC screen but when projected the windows were illuminated by radiant pink lines. So do you think this is a pp issue in general rather then related to Picasa in particular?
 
mik0m said:
I've seen this happen on a DPI of a cathedral interior pp in photoshop CS5. It looked fine on the PC screen but when projected the windows were illuminated by radiant pink lines. So do you think this is a pp issue in general rather then related to Picasa in particular?
Click to expand...

I have now been reliably informed that Picasa was used in the initial pp process and then the image processing was completed in CS5 so it appears Picasa could be throwing this up
 
David

I thought you perhaps just wanted to see the Exif. No worries.


I might add that the shots looked fine on the camera (also would add that the windows previewer and Gimp also showed pink clouds so must depend on the quality of the software)

thanks for all the help everyone :)
 
sturisoma said:
Gimp also showed pink clouds so must depend on the quality of the software
Click to expand...
GIMP uses (or used to use) UFRaw for RAW files, which uses DCRaw. Even if it doesn't use UFRaw any more it probably still uses DCRaw.
 
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