Posted by Kevin McNeal on May 13, 2008 at 12:15 PM
I know there are a lot of smart camera people on this forum, so I thought I would try to figure out what is going wrong in terms of distortion with this image where it is selected ? Every image is like this that I took from here in the red tulips - is it because I blew the red channel - is it the camera distorting it ? Do I need to upgrade my 5D ?
Thanks for any kind of help you can think of !
P.S. the raw image is the same distortion !
Does the 5D have individual RGB blinking highlights?
Posted by Kevin McNeal on May 13, 2008 at 12:39 PM
Not that I know of ! I have it on all RGB channels but I do not think their is an individual blinking for each color just the composite and when I took it none of the channels were blown at the time.
I'm not sure exactly what you mean by distortion here. What I see on my monitor is loss of detail and perhaps flattening in the red tulips. If that's what you're concerned with and none of the RGB channels are blown*, then consider the possibility that the colors recorded by your camera are out-of-gamut for the space that you are editing and printing in. Cameras can record colors that are outside both sRGB and Adobe RGB. Red/orange are famous for not fitting into the smaller color spaces. If that's the problem, then you can work around it in post processing.
*(check them in ACR, if the 5D does not show histograms for individual RGB channels)
Kevin, dumb question, but you are processing the RAW file, correct? And PS or what you're using can't tame that area? One thing I noticed on my 5D, the red in the JPEGs is unusable, totally over saturated, but I don't use the JPEGs so it doesn't bother me (I'm sure Picture Styles set to "Landscape" would help that red issue if I were using the JPEGs).
Anyway, when you open the RAW file, do it as AdobeRGB(1998) instead of sRGB to get more headroom, then see if the Red channel is still lost. You can later convert it to sRGB for web. In fact, you'll get even more headroom from ProPhoto. Hopefully the Red channel isn't so blown that it can't be tamed. Just FYI, Tim Grey's Color Confidence 2 book is a great guide on colorspaces and capturing image info. I'm not sure it's the camera or you'd see it all across the tulips.
Could you post your 5D settings? I'm really puzzled why you're seeing this & not having enough battery power with your cam. I just went out shooting yesterday all day long and although the battery went low mid-day, I still shot the rest of the day without a problem. And like I said when we met, I leave the camera on most of the time.
I'm thinking if you tweaked your camera settings to something like I have, you'd get better performance.
Discussion
7 repliesThanks for any kind of help you can think of !
P.S. the raw image is the same distortion !
*(check them in ACR, if the 5D does not show histograms for individual RGB channels)
Can you post a crop of just that area so we can see it better?
Kevin, dumb question, but you are processing the RAW file, correct? And PS or what you're using can't tame that area? One thing I noticed on my 5D, the red in the JPEGs is unusable, totally over saturated, but I don't use the JPEGs so it doesn't bother me (I'm sure Picture Styles set to "Landscape" would help that red issue if I were using the JPEGs).
Anyway, when you open the RAW file, do it as AdobeRGB(1998) instead of sRGB to get more headroom, then see if the Red channel is still lost. You can later convert it to sRGB for web. In fact, you'll get even more headroom from ProPhoto. Hopefully the Red channel isn't so blown that it can't be tamed. Just FYI, Tim Grey's Color Confidence 2 book is a great guide on colorspaces and capturing image info. I'm not sure it's the camera or you'd see it all across the tulips.
Could you post your 5D settings? I'm really puzzled why you're seeing this & not having enough battery power with your cam. I just went out shooting yesterday all day long and although the battery went low mid-day, I still shot the rest of the day without a problem. And like I said when we met, I leave the camera on most of the time.
I'm thinking if you tweaked your camera settings to something like I have, you'd get better performance.
FYI, here's the batts I use (except mine's 1800 mAh). IMO, they're better than OEM. http://www.sterlingtek.com/ln03-canon-bp-511-dlc511.html or even better price: http://www.sterlingtek.com/twocabp18bap1.html
Kevin