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09/18/2011 06:31:44 AM · #1 |
i used to work as a roadie and still part time hence i shoot a lot of friends bands etc in small venues and they all seem to favour red parkan lights be it normal or LED and i'm having trouble other than shooting with flash or in black and white getting any highlight detail with the intensity of the red light.
is there any thing i can do, i cycled through the WB setting with not much luck, so im thinking maybe need to change colour temperature??
any help would be gratefully received thanks in advance Giles
canon 5d 50mm mk11 or 28-70 2.8L are my usual gig lenses with iso around 1000
example from last friday night
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09/18/2011 10:32:02 AM · #2 |
I see you had set exposure manually, 1/100s, f/2.8 @ ISO 1600. Good start. Were you going by the histogram? If so, and if you did not have the histogram display in RGB mode, it probably didn't tell you that the red channel was blown. Compounding the problem of the blown red channel, the blue channel is *so* dark that you are only recording a few levels, meaning you get posterization in that channel as well. It's a tough lighting situation, but one that you can tame.
Also wondering whether you shot this in JPEG or RAW? Shooting in JPEG would have made the issue worse, because you couldn't recover any of the blown highlights during conversion.
Suggestions:
- First, set your WB to tungsten. That's probably the closest to what you want, and will give you consistent results so that you can treat all your shots the same way in post. An alternative to this is to set a manual kelvin WB, but unless you know what will work, I think you are better off with Tungsten.
- Second, shoot RAW if you are comfortable doing so. If not, I'd suggest experimenting with it. It has great benefits.
- Third, If you are not using the RGB histogram display, do so. Watch for when the red channel starts to clip, and avoid it.
- Consider using a little fill flash. You'll get more data in the blue channel as a result, and that will reduce the posterization in that channel
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09/18/2011 11:46:41 AM · #3 |
thanks for the tips, yeah i had histogram on but it was in sRGB and 5200k should i change it to abode RGB? and could see it was blowing out on the lcd preview, hence playing with the white balance trying K and bulb etc but with not much noticable results, i was shooting large jpeg always used to shoot raw but photos currently total over a TB so went to large jpeg as only for web etc but i'll try again with raw. i do shoot raw for when playing hdr, i shot three gigs on friday and on the other two in bars and our club i used my ex550 on manual at 1/128 pointing up with the diffusing screen set in the reflector position. but this gig was in a little 50 seat theatre and felt to intimate for flash.
theatre
using my 1.8 50mm on a lower 500 iso then converter to slight sepia brought ok results, i also changed the picture settings from portrait which has a +3 contrast i think to faithfull which is all 0 on the 5d which brought better results,
im also having a problem with my 5d even with lcd brigtness set right down that the shots on the lcd look a lot brighter than on my 17" mac book pro, now i know the lcd is better quality than my 4 yr old mac book pro but started to not trust the meter, stop it down a stop then be under exposed on review in aperture. hence now back to trusting the metre on the camera, but annoying non the less.
right bring on next gig for a play around
Message edited by author 2011-09-18 11:48:56. |
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09/18/2011 12:08:14 PM · #4 |
| Recall that when you have a very strong red light your sensor is effectively using only 1/4th of it's pixels. Even if you get the WB right you can expect some image degradation. |
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09/18/2011 02:15:25 PM · #5 |
Metering is averaing all the light colors, so it's not picking up that the one channel, red in this case is being blown out. The suggestion about using the RGB histogram and avoid clipping is a good one. Shoot RAW is good too.
If you shoot JPG, set the color controls and contrast in their mildest settings, and correct later in processing. The pix will look pretty dark in your LCD, but will be ok when you bring them up in processing. It will be a juggle between blow out and noise. Spot metering may also help some. |
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