| Author | Thread |
|
|
04/26/2006 04:54:03 PM · #1 |
I was looking at this fliter - Low Contrast Filter - and began to wonder; Wouldn't a low contrast filter increase dynamic range of a processed photo if you adjust curves to black blacks and white whites?
The only thing that concerns me is that if I tried using the filter to increase dynamic range of photos, would I get banding in the midtones?
Anyone using these filters? Any photos to post?
|
|
|
|
04/26/2006 04:59:36 PM · #2 |
From the spec at BH it seems to generally spread the highlights a bit, giving the overall lower contrast. I wonder if it softens the image as a result too, given the halos on any bright parts of the image.
Certainly the further you push the bits around in an image, the more likelyhood of banding you have, though with 10bit files you'll probably be okay, or with more minimal adjustments.
My typical solution is to avoid shooting in really high contrast light. It is an interesting idea though (seems to be typically a video application? ) |
|
|
|
04/26/2006 05:00:31 PM · #3 |
This filter is basically a special effects filter that introduces flare into the image, washing out the dark areas to greater or lesser degree depending on how strong it is. They come in various strengths. The effect will be similar to what you attain by opening the levels dialogue box and moving the leftmost pointer on the "range" slider to the right a bit; it will give you washed-out darks. It won't add any detail to them. So it won't help your dynamic range problems; by adjusting in post to bring the blacks back down, you're simply cancelling the effect of the filter. And it's VERY expenisve glass :-)
R.
|
|
|
|
04/26/2006 05:08:54 PM · #4 |
Thanks Bear for saving my checking account from an expensive experiment :-) At least I've learned to post my ideas before I go blowing wads of dough on brainstorms.
|
|
|
|
04/26/2006 05:21:16 PM · #5 |
Originally posted by fotomann_forever:
...before I go blowing wads of dough on brainstorms. |
You mean Cheddar, not dough right? |
|
|
|
04/26/2006 05:22:40 PM · #6 |
| You already set the contrast setting really low in camera right? If you want more dynamic range, you could always get some L-series lenses and a 1Dmk2 or 5D ;p |
|
|
|
04/26/2006 05:27:42 PM · #7 |
Originally posted by MadMan2k:
You already set the contrast setting really low in camera right? If you want more dynamic range, you could always get some L-series lenses and a 1Dmk2 or 5D ;p |
My 300D hasn't left RAW since I got it, so I'm going for max already with my camera. I was just wondering if I could push dynamic range even further.
BTW, if anyone wants to donate a 5d or 1DsMkII I'd be happy to accept :-) Of course, I'll also accept a 20D even a 10D. Hell, I'll even take Nikon gear... LOL
|
|
|
|
04/26/2006 05:32:10 PM · #8 |
Originally posted by MadMan2k:
You already set the contrast setting really low in camera right? If you want more dynamic range, you could always get some L-series lenses and a 1Dmk2 or 5D ;p |
This cameras are digital too. Then, limited by sensor and digital technology to behave like transparency film, with much less dynamic range than negative film.
Can this cameras manipulate more than typical 5-6 stops ranges?
|
|
|
|
04/26/2006 05:39:20 PM · #9 |
| They might not be as good as good negative film, but the 1Dmk2 and 5D sensors have much better dynamic range than the 300D. |
|
|
|
04/26/2006 05:59:00 PM · #10 |
Originally posted by MadMan2k:
They might not be as good as good negative film, but the 1Dmk2 and 5D sensors have much better dynamic range than the 300D. |
Yup. I'll take one.
|
|
|
|
04/27/2006 12:23:25 PM · #11 |
Have you seen photoshop's High Dynamic Range feature? Take multiple shots a stop apart and make a 32bit image...
//www.luminous-landscape.com/tutorials/hdr.shtml
Pretty slick I think. |
|
|
|
04/27/2006 02:50:10 PM · #12 |
Originally posted by MadMan2k:
They might not be as good as good negative film, but the 1Dmk2 and 5D sensors have much better dynamic range than the 300D. |
Actually, IMO they are as good as negative film. I have never seen anyone claim that negative film has more than about 8 stops of usable recording range (that's different than the density range) even when exposed spot-on. The top Canon DSLRs equal this performance. I've seen step-chart results evaluated using Imatest that show 8.3 stops for the 1DMkII. I haven't seen like results for the 5D, but it won't be worse, nor is it likely to be perceptibly better... the pixel size is precisely the same and it's the same sensor and image processing technology.
At equavalent, ISO, these two Canon DSLRs have much lower noise than negative film, and so arguably the full dynamic range is more usable. This is a debatable point, however, since the digital noise can be more unpleasant than film grain.
|
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 08/30/2025 05:55:14 AM EDT.
