Magenta and green blotches

Discussion in 'Technical Troubleshooting' started by Eleanor, Mar 26, 2019.

  1. Eleanor

    Eleanor New Member

    Joined:
    Mar 25, 2019
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    Equipment:
    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    hello, I have a Canon 60D. I shoot with several lenses. Each of which show signs of magenta and green blotches and casts when I shoot with them, which leads me to believe it is the camera. It depends on what I am shooting. You can see in the snow of the image I uploaded, the magenta cast like a vignette. I also shot some snowy woods and the brown drab woods has blotchy green patches and magenta. there are no leaves and o blue sky. Everything was just gray. I tried removing CA which helps with the branches again the sky but the trunks are blotchy too. It might be hard to see in the woods but if you blow it up you can see green blotches and magenta. .

    My computer is brand new 2 days old Dell with all the bells and whistles. But I also had this problem on the old computer. And my monitor is also new and is an Eizo 2420. i called them first and they even took control of my computer and helped me calibrate my monitor professionally with i1 display pro. It did not make much difference. It just toned it down a little bit but it is still there. I then reset my camera to the default settings to remove any custom settings I may have set and it helped a little but it is still there. If i pull the vibrancy down in photoshop, I can make it less and almost gone but I cant do that all the time. This camera has some serious CA issues with magenta and cyan. Can anyone else see what i am seeing in my photos. I will attach them. Could this be a firmware thing? when I enlarge my prints it is a real problem. Thanks for any help you can offer. magenta-and-cyan-hue.jpg cemetery-woods-8589.jpg
     

  2. GDN

    GDN Well-Known Member

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    Hi Eleanor,

    Hello and welcome to the forum.

    A couple of questions just to try and help you out here.

    You say you get colour casts. Is this just when you shoot images in the snow? I am thinking along the lines of could it be a white balance setting? I have not been anywhere near snow with my Canon kit, but I know that snow will give colour casts with my Pentax gear if I don't change the white balance.

    Do you shoot RAW, or do you shoot jpeg? Lastly, do you get these colour casts with all of your lens? Or just the wide angle ones? I see you use photoshop as your processing software, have you tried any other processing software?

    Sorry about all of the questions.

    Gary
     
  3. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    Good morning Gary. Thank you for your questions. I definitely shoot in raw. I usually just leave my white balance on auto and then in camera Raw I can change it to whatever I choose or leave it the way it is usually does a pretty halfway decent job. But I do have problems with Cloudy Skies snow and branches against the sky. I get a lot of noise with fog no matter what I shooted at and get blotchiness. I get this magenta cast Over grey clouds Etc.
    No I haven't tried any other processing software. I looked at three different images that I used three different lenses on. The 70 to 200 4.0 is better than the rest it doesn't get as much of a color cast but does give me chromatic aberration in the branches in the sky. The worst one was my Sigma gold 10 to 20. It always cast a vignette which is the one that I used with the buggy. The woods were shot with the 18-55 kit lens. If I bring down they contrast and I don't make too many adjustments it stays pretty muted but if I do any kind of adjustments it just enhances the blotchiness. At first I thought it might just be the cheap kit lens but it's doing it with my expensive lenses. It has to be the camera. Maybe it is a white balance setting but I changed that in camera Raw from Auto to cloudy or whatever the day was. But the camera does shoot automatic white balance pretty decently. I just feel the chromatic aberration is way more than any camera I've ever had it's a real problem and it cost me a lot of time. And the reason I put out all this money for better equipment computer and monitor wise. I thought maybe it was just my cheap computer monitor or bad graphics card. But now I just think that may be chromatic aberration is what was making blotchiness as its surrounds each pixel. But I just don't know. Thank you for your help
     
  4. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    I think I should mention on the Sigma gold 10 20 has a clear glare filter that it came with. That could definitely be causing more of a magenta cast. But I still have a serious chromatic aberration situation. Photoshop clears it up pretty good in the branches but it doesn't do much to the snow or the sky
     
    Last edited: Mar 26, 2019
  5. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    Looking at some other images you can see in this one clearly too much green and magenta. As you can see I turned off the only adjustment layer which was a slight curves adjustment so you can see the original magenta-green-blotches4-.jpg magenta-green-blotches3-.jpg is just terrible.
     
  6. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    This one looks nice from a distance but when I zoom in , the midtone areas have green and magenta. abandoned-house-Amana-IAIMG_8521.jpg magenta-green-blotches5-.jpg
     

    Attached Files:

  7. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    It seems to be midtones or neutrals??? this one is just terrible. What is going on? Thanks to anyone that tries to help :) magenta-green-blotches6-.jpg
     
  8. Ray-UK

    Ray-UK Member Site Supporter

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    Canon 7D Mk II, Canon 10-22, Canon 24-105 L Mk 1, Canon 24mm 2.8, Canon 55-250 STM, Canon 100mm usm macro, 3x Metz 58 AF1 & too many film cameras, mainly Pentax
    A lot of what you are complaing about is chromatic abberation, this is a lens defect and cannot be caused by the camera, it is fixable using whichever software you use for processing.
    As regards the snow shots, colour casts are a common problem and are more to do with the fact that the camera sensor reproduces what it sees unlike our eyes where our brains process the image from them to produce what we expect to see. The colours that show up in snow are usually a reflection of surrounding areas but these are often exaggerated if the white balance and exposure are not quite right. You cannot rely on auto exposure or auto white balance when shooting snow scenes
     
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  9. Eleanor

    Eleanor New Member

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    Canon 60D, Sigma Gold 10-20 and the kit 18-55, 70-200 4.0
    Thank you so much for your response. I feel you are correct. I just wanted to make sure. It was getting pretty bad. CA correction just isn't correcting it good enough. I never saw it so bad. I will have to set my white balance with a white card I guess. I just thought I could adjust it in RAW. I guess not. My equipment is very old as well and probably needs some maintenance. Thank you!
     
  10. johnsey

    johnsey Site Moderator Staff Member Site Supporter

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    5dMk4, 5dsR, 5dMk2, 20D, 70-200 2.8L IS, 100mm 2.8 Macro USM, 50mm 1.4, 85mm 1.8, 17-40mm 4.0L, TS-E 24mm 3.5L II, Rokinon 14mm 2.8; Pixma Pro-100
    CA will be more prevalent in different light situations and shows up on different lenses more than others. I bet the 18-55 kit lens shows significantly more than the other two. The 70-200 is an L lens and probably the best out of the group for CA. I have no experience with your sigma. Your camera isn't that old and your lenses should last forever if well cared for, I doubt any of it need maintenance. Much of my digital kit is a decade old and works perfect, my medium and large format stuff enters into multiple decades old.
     
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  11. Tonytee

    Tonytee Well-Known Member Site Supporter

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    Telephoto Lens.
    Hello Eleanor,

    I must agree with johnsey. Telephoto lenses are notorious for CA. However, not all telephotos cause this problem. If you can gain access to a Canon Prime Lens, it would be interesting to see what happens. A prime lens has a fixed focal length, i,e., 100mm, 105mm. As far as
    White Balance goes, in my 10 years in digital photography, I have found that I cannot rely on it. I have better results working with it manually. I have also found that I cannot rely on auto-focus on any manufacturer's products, therefore I am now using Manual Focus exclusively and am very happy with it. Hope this helps. :))
    Tony
     

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