| Author | Thread |
|
|
04/03/2004 08:41:17 PM · #1 |
(If you intend to vote on this image it is probably best to do so before reading this thread.)
If you zoom in on this picture you can see that the borders between the branches/blossoms and the background are heavily speckled. What causes this and how can it be avoided? I thought it might be something to do with sharpening, the contrast or even the focus.
Message edited by timj351 - Removed link to a current challenge photo.. |
|
|
|
04/03/2004 08:51:13 PM · #2 |
| I know you realize you cant post a shot of a current challenge...certainnly this is not in a current challenge, you are just looking for advise for the future....correct? |
|
|
|
04/03/2004 09:00:29 PM · #3 |
how am i supposed to know if i plan to vote on it?
not looking.
|
|
|
|
04/03/2004 09:07:47 PM · #4 |
| I think that you can prevent the pixelation that you are speaking of by taking your pictures at the maximum quality that your camera allows. If you are shooting your pics in a resolution that is is only acceptable for the web, you have no chance of printing or enlarging decent representations of your work. Buy a larger memmory card, and quit worrying about how many pictures you can take. Just take the shots that move you, at the maximum quality that your camera will allow. |
|
|
|
04/03/2004 10:16:17 PM · #5 |
As rananculus said, make sure you shoot at the highest quality your camera allows. Also, be sure to use the lowest ISO setting available- the higher that number, the more noise you'll get on any camera.
To Riggs' point, I suggest you edit your message to remove the link if this photo is in the current Challenge. Otherwise, you will probably be disqualified for failing to maintain anonymity during the voting. Just post an unrelated shot from the same camera to illustrate your problem. |
|
|
|
04/04/2004 12:09:05 AM · #6 |
This is a link to a photo in a current challenge. Can we get SC to remove the link, please?
|
|
|
|
04/04/2004 12:40:00 AM · #7 |
I had to remove the link because the photo is for a current challenge. I think discussing this particular issue without showing or discussing the specific photo is fine.
T
|
|
|
|
04/04/2004 01:37:57 AM · #8 |
If this is just some kind of digital noise, it may simply be that the image was processed too much. Adding contrast, fiddling with colors, oversharpening--or sharpening at too high a pixel radius or too high a threshold, cropping drastically and enlarging the photo: these can all cause such noise.
|
|
|
|
04/05/2004 09:27:54 AM · #9 |
Firstly, sorry for posting a current challenge picture (I didn't know this was banned; don't know what Riggs is trying to say). I have no idea what camera it was taken with or what the quality was etc. because, er, these things are not available for viewing. All I know is that I've seen the speckles before and wondered how come the camera can speckle some parts and smooth others. Thanks for the serious answers.
|
|
|
|
04/09/2004 07:36:57 PM · #10 |
Just in case there is still interest in this topic, are the PSP filters "Edge Preserving Smooth" and "JPEG Artifact Removal" allowed in basic editing? I have been experimenting with this annoying speckling - finding out how to cause it, how to remove it etc. - and these two filters are both effective at getting rid of it.
In the rules it says you can use filters that "...preserve the integrity of the image and/or reduce the effects of noise, scratches, etc." but it also says "No effects filters may be applied to your image, with the exception of Noise and Gaussian blur, the two of which are allowed."
The filters I am using remove noise, but in some ways they are also selective in what parts of the image the adjust, so I don't know if they are allowed or not. Does anyone know?
|
|
|
|
04/09/2004 07:54:17 PM · #11 |
| You need a Rebel and 1000 $ lense and problem is fixed :-) |
|
|
|
04/09/2004 09:43:41 PM · #12 |
The ISte Council are of course the final judges of your question, but I would imagine that both of those are allowed ... if Neatimage is allowed, which it specifically is, then you should be OK with those ... provided they're applied to the whole image, and not to a selected area.
E
|
|
|
|
04/10/2004 08:04:34 AM · #13 |
Thanks, e301. I'll use the filters until told not to, I suppose.
|
|
|
|
04/10/2004 10:32:11 AM · #14 |
Originally posted by SquirreI:
Just in case there is still interest in this topic, are the PSP filters "Edge Preserving Smooth" and "JPEG Artifact Removal" allowed in basic editing? |
It's hard to judge if these are "legal" or not without seeing some examples of what they do. Perhaps you can prepare some small samples to demonstrate the effect, at both "usual" and extreme settings.
Based on the filter names alone, I'd suspect that the "JPEG Artifact Removal" is fine, but the other needs evaluation. But if you use them discreetly to make a natural-looking photo (but don't win), probably no one will know.
Message edited by author 2004-04-10 10:32:31. |
|
|
|
04/10/2004 12:51:11 PM · #15 |
GeneralE...Here is a PSP example of the Edge Preserving Smooth effect.
The Original is very grainy, taken with a Super Macro setting.
Here, the Final's noise is reducted and the only other thing done to the final image is a little bit of brightness/contrast.
I hope that helps.
Message edited by author 2004-04-10 15:23:33.
|
|
|
|
04/10/2004 08:41:22 PM · #16 |
I've drawn up a test picture made up of some random coloured shapes with noise added to them. It seems that Edge Preserving Smooth blurs most of the noise away, but where it detects some high contrast it retains the edge as best it can. The main disadvantages are that it can remove some of the detail you want to keep, and that there is a small amount of blurring around most edges, even black against white. I don't have any way of posting my before / after pictures but I can try to email them if this filter might be breaking some rules.
|
|
|
|
04/12/2004 08:45:39 PM · #17 |
Now I can upload pictures, here is what I was talking about:
Before
Amount = 5
Amount = 20
|
|
|
|
04/12/2004 10:34:05 PM · #18 |
| Both of those are noise removing filters and as such, I would think, are comparable to neat image. I have used edge perserving smooth on some of my entries because it is an alternative to neat image. |
|
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: 09/03/2025 06:03:47 PM EDT.
