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Strange blue color

1101 Views 13 Replies Latest reply: Oct 27, 2013 2:54 AM by M@rk1x RSS
wolframs Calculating status...
Currently Being Moderated
Dec 2, 2012 6:10 AM

Hello

 

shooting many events, I frequently have problems rendering strong blue colour. The blue comes from these new LED lights. In Aperture it gets magenta and is seperated from the natural looking surrounding by a unnaturally looking harsh border. I tried DxO 8 and capture One Pro 7. These don't show this error. Here is a screenshot of sample image rendered in 4 RAW Processors, including Adobe Camera RAW 3.4.3. Adobe Camera RAW has the problem too, but not so intense.

 

Any idea how to avoid this? I didn't find a solution. Clicking o the image enlarges it.

 

Aperture_Feedback_LED_blue.jpg

Aperture 3, OS X Mountain Lion (10.8.2)
  • léonie Level 8 Level 8 (46,350 points)
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    Dec 3, 2012 2:03 AM (in response to wolframs)

    I'd try to find a filter specific for the wavelength of the LED lights to put in front of your lens when you are shooting. Or use a very strong flashlight, to compensate the blue light, so that the effect is not so prominent.

    Correcting the problem afterwards can only be done by brushing away the blue and pink (with the curves adjustment) from the effected highlight areas, this will be a lot of work.

     

    Regards

     

    Léonie

  • léonie Level 8 Level 8 (46,350 points)
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    Jan 12, 2013 3:41 AM (in response to wolframs)

    Wolfram,

    I don't have your camera. Do you use a setting like "Canon's Preserve Highlights"? Aperture does not understand this tag. In consequence, when you use it, the jpeg will look o.k., but the raw will have a wrong exposure that may blow out the highlights.

     

    The camera specific software will be able to render the raw correctly, but Aperture not. The problem will be most noticable in difficult lighting situations.

     

                                                                                                       Re: Aperture D600 Raw Files too dark?    

  • léonie Level 8 Level 8 (46,350 points)
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    Jan 12, 2013 4:34 AM (in response to wolframs)
    If you like I can send you the NEF and the JPEG to see it by yourself.

     

    It might be better to upload the files to a server and post the link. Then other frequent posters here can try it also. If we are lucky, someone who has the same camera will chime in.

     

    I remember that I have seen these magenta casts in difficult lighting conditions in another thread shortly before Christmas, but I cannot find it again.

     

    The images you are posting - are these images exported from Aperture or screenshots? Are all examples using the same color profile?

  • léonie Level 8 Level 8 (46,350 points)
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    Jan 12, 2013 7:48 AM (in response to wolframs)

    Here is a link to another thread comparing images taken in poor lighting conditions:

    Re: Does Aperture Pre Edit Your Images?

  • léonie Level 8 Level 8 (46,350 points)
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    Jan 12, 2013 11:16 AM (in response to wolframs)

    Wolfram,

    I experimented a bit with your raw+jpeg pair.

    The blue in the raw is really far too intense.

    So far it seems to me that the most promising adjustment would be to reduce the the boost settings in the raw fine tuning. By default my boost settings are set to maximum. If I reduce Boost and Hue Boost to zero, at least the details in the blue shadows come back again. The blue is still too intense, but the details are preserved.

    The image to the left shows the result of reduced Boost parameters.

    rawBlue.png

    The next step would be to increase the red+green intensities to lighten the dark areas and to reduce the blue saturation.

  • léonie Level 8 Level 8 (46,350 points)
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    Jan 13, 2013 5:06 AM (in response to wolframs)

    You are welcome, Wolfram,

    yes, that looks pretty good now.

     

    Here is another strange-blue-color thread - Ernie Stamper sent me the link: Re: Raw Color Treatment

     

    I hope we can solve this puzzle one day!

     

    Ich wünsche einen schönen Sonntag.

     

    Léonie

  • M@rk1x Level 1 Level 1 (0 points)
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    Oct 27, 2013 2:54 AM (in response to wolframs)

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