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03/14/2007 11:27:57 PM · #26 |
Originally posted by stdavidson:
Somewhere along the line some form of trickery is needed. That can come from artificially produced ISO noise in-camera, some type of physical filtering in front of the lens, 'faked' grain in the actual composition, added noise in post, added grain in post, oversharpening combined with gaussian blur or a combination of these effects.
Apparently, based on the entries, it isn't all that easy. ;) |
Originally posted by LevT:
Agree completely. That's why people out there already scanned actual films and are using these hi-res files to produce very natural-looking "film" grain in digital photos. My point here was that adding lots of Photoshop noise in PP is the easiest but far not the best form of such trickery... :) |
I actually got the best results because of my subject material. A high ISO, shooting in RAW, and playing a little in PS helped, but without the baseline subject, I doubt I could have pulled a decent entry and mine's been 6.6+ pretty much all day.
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03/15/2007 12:25:22 AM · #27 |
| This has been a really great discussion on Noise Grain or what you wish to call it, with challenges like this the learning curve is really extended. thanks every one. |
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03/15/2007 12:26:24 AM · #28 |
Originally posted by hywind:
Going through the challenge there is a vast diversity of grain effects, and some the grain is so slight it is hard to see how the grain adds impact to the image, as stated in the details,and others just apopear to be a snap shot with grain added, what are your thoughts. |
Well issue is people forced the grain. |
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03/15/2007 12:35:42 AM · #29 |
Originally posted by hywind:
If a photographer was to use a high ISO 800+ at a slow Shutter speed 100- this should add enough natural noise grain to be evident in the image and be processed to give impact. |
Mine was shot at ISO1600, f/10 @ 1/25sec, and while the full-res version had a fair amount of inherent noise (though the 20D is so good at noise suppression, it still wasn't "bad"), after resize to 640 it was almost clean ... thus adding grain in post was the only way.
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03/15/2007 12:41:14 AM · #30 |
Originally posted by LevT:
I guess it depends on what you call "natural". If you mean "out-of-camera", one way to get LOTS of noise is to severely underexpose (3-4 stops) and then bring the exposure back in RAW conversion. |
Along these lines, I properly exposed my subject when shooting then dialed down the exposure during RAW conversion and "forced" image grain/noise using Shadow/Highlight adjustment in post by cranking the Shadow recovery settings. It left me with an image that'd been properly exposed to start with, versus muddy or underexposed, then grainy after shadow recovery but with a suitable histogram (versus being pushed to the left).
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03/15/2007 01:07:01 AM · #31 |
| Any iso, underexpose, use levels to bring up the noise, voila. |
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03/15/2007 02:29:44 AM · #32 |
Originally posted by stdavidson:
The benefit of generating "grain" in post processing and not in-camera is that you have tons more flexibility. Basically, you can do anything you want to prepare the image for output just like any other non-grain image prior to adding "grain" independantly at any appropriate time in your workflow. Then you can either include or not include grain at your own discretion. If "grain" is generated in-camera you don't have that flexibility. |
Again, I agree, as I wrote before the best way is to mix a real film grain with a digital image in post-processing. However it would not work within DPC rules, especially in a basic challenge.
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03/15/2007 02:54:50 AM · #33 |
| noise is quite high in the sony a100 anyway, but i do feel it is more grainy noise then the colour splodges i used to get from my 350d, it will be good to look at the quality of noise made by cameras just using high iso settings, will be a very good challenge to look back on to help choose a camera. |
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