Luminous Landscape Forum
Equipment & Techniques => Beginner's Questions => Topic started by: RMichael on August 27, 2007, 07:26:14 am
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Hi
I shoot in JPEG and post process in Photoshop CS2. I find that after processing, applying things like curves, auto levels etc, the resized image has grain that was not there in the original.Is there something I am doing wrong? How can I prevent it? Will be grateful for any help.
Regards
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Shooting in RAW will help a lot as will shooting at a lower iso. Otherwise you can use the noise reduction filter in PS, making sure you check the 'remove jpeg artifact' box. Or you can use seperate software such as noise ninja.
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Do you mean that the resizing step itself introduces grain, or that the sum total of steps from the original introduces grain? If the latter, then is the grain mainly in the darker areas? With digital images, darker areas tend to be grainier than lighter areas, but the grain isn't so visible when they're dark; however, if part of the post-processing is lightening the image, the graininess in the dark areas becomes much more visible when they are lightened. Could that be what you're talking about? If so, there are two ways to reduce it: (1) expose as far to the right as possible, so your dark areas aren't too dark (and hence grainy) to begin with (only possible when the scene's dynamic range isn't too much), or (2) use a tripod to take multiple shots at different exposures, one for the highlights and one for the shadows (which won't be too dark then), and blend them in PS later.
If the graininess is most visible in the sky or other relatively uniform-color regions, one way to make it less visible is to select just that region and then apply a Gaussian Blur filter to smooth out the graininess.
Lisa
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Thanks mahleu.
Lisa, I am talking about sum total of all the effects. It also occurs when I try to watermark and then flatten an image. Would you know of some technique of watermarking that a novice could use? Then again, why would a novice need watermarking :-). I'd be grateful nevertheless.
I am still learning both my camera and photoshop, so it would really help if you could show me how to blend different exposure photos in Photoshop, or if you know of some tutorial.
Thanks and Regards
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Mahleu, I have a problem with RAW. I wonder if you or someone could help me with it. I have a Pentax K10 d and when I open a RAW shot in photoshop, it opens in the Pentax browser. Is there anyway to open it in Adobe Raw? I am not very familiar with photoshop though.
Thanks and Regards
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I am still learning both my camera and photoshop, so it would really help if you could show me how to blend different exposure photos in Photoshop, or if you know of some tutorial.
Right here on this web site:
http://www.luminous-landscape.com/tutorial...-blending.shtml (http://www.luminous-landscape.com/tutorials/digital-blending.shtml)
Would you know of some technique of watermarking that a novice could use?
Sorry, I've never tried watermarking - anyone else here???
Lisa
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Thanks mahleu.
Lisa, I am talking about sum total of all the effects. It also occurs when I try to watermark and then flatten an image. Would you know of some technique of watermarking that a novice could use? Then again, why would a novice need watermarking :-). I'd be grateful nevertheless.
I am still learning both my camera and photoshop, so it would really help if you could show meĀ how to blend different exposure photos in Photoshop, or if you know of some tutorial.
Thanks and Regards
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Russell Brown has a Watermarking video tutorial ([a href=\"http://www.russellbrown.com/tips_tech.html]here[/url] - scroll to "Digital Watermark Branding") or you could try to google for photoshop watermarking actions...
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Mahleu, I have a problem with RAW. I wonder if you or someone could help me with it. I have a Pentax K10 d and when I open a RAW shot in photoshop, it opens in the Pentax browser. Is there anyway to open it in Adobe Raw? I am not very familiar with photoshop though.
Thanks and Regards
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Try manually opening it from within photoshop (file>open).
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Thanks Francoise, Lisa and Mahleu. It's been a great help.
Regards
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When you save your work, try saving it as a TIFF file. Since JPEG files are compressed, if you save your work as a JPEG you are compressing a compressed file and that can sometimes lead to a grainy look.