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#11
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"Advanced" image processing
Alfred Molon wrote:
Just curious if anybody knows techniques to substantially enhance images taken under bad lighting or weather conditions. For instance if you shot photos on an overcast, dark day, if there is a way to make these photos shine. Would it be possible to transform an overcast sky into a nice blue sky? Or if you shot images under hazy conditions, with poor visibility, would it be possible to give these images "vibrance", good contrast and colours and if so how? There are a lot of things you can do to punch up a photo, but in doing so you risk lossing the mood that it captured. The worst part is that if you go too far you end up with photos that look like Ken Rockwell's. http://www.kenrockwell.com/gallery.htm To me a photo is good if it captures at best it can the mood at the time, if this is grey and overcast so be it. I have seen people paste a blue sky in a photo that was taken when it was overcast, not a good look at all. When I have done heavy editing of a photo to try really punch it up I find that I might like it, for about 5 minutes but the more I look at it the more it just seem to look very wrong. Scott |
#12
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"Advanced" image processing
Alfred Molon wrote:
Just curious if anybody knows techniques to substantially enhance images taken under bad lighting or weather conditions. For instance if you shot photos on an overcast, dark day, if there is a way to make these photos shine. Would it be possible to transform an overcast sky into a nice blue sky? Or if you shot images under hazy conditions, with poor visibility, would it be possible to give these images "vibrance", good contrast and colours and if so how? Paint Shop Pro includes filters which aim to do some of this, by contrast and saturation changes. Look at tools like "Clarify" and "One-step photo fix". But you can't turn clouds into clear blue sky (except by replacement), and there's no way to create shadows from the existing image imformation (except by guessing where they might be) to increase the dynamic of an image. David |
#13
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"Advanced" image processing
In article , Charles
Schuler says... Wow, what a question. You can replace the whole sky with Photoshop! You can adjust the heck out of everything! It's not that easy. If you simply replace an overcast sky with a blue sky, it will be very obvious for everybody because the lighting in the rest of the image will not match. Additional steps would be necessary and I wonder which ones. I'm not even sure you can do that and get a natural looking result. The other option would be to keep the overcast sky and process the image to make it look better, but then what would you do? -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330, E400 and E500 forum at http://tech.groups.yahoo.com/group/MyOlympus/ Olympus E330 resource - http://myolympus.org/E330/ |
#14
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"Advanced" image processing
In article m, Scott W
says... There are a lot of things you can do to punch up a photo, but in doing so you risk lossing the mood that it captured. The worst part is that if you go too far you end up with photos that look like Ken Rockwell's. http://www.kenrockwell.com/gallery.htm Ok, these are way oversaturated. To me a photo is good if it captures at best it can the mood at the time, if this is grey and overcast so be it. I have seen people paste a blue sky in a photo that was taken when it was overcast, not a good look at all. I once saw a before-after image of an image restoration artist who successfully managed to replace an overcast sky with a blue sky. The photo still looked natural. I wonder how he did it. -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330, E400 and E500 forum at http://tech.groups.yahoo.com/group/MyOlympus/ Olympus E330 resource - http://myolympus.org/E330/ |
#15
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"Advanced" image processing
In article , Ken Tough says...
Why don't you put an example shot on a webpage somewhere, and challenge readers to do their best at improving the shot. It's a fun exercise. Ok, here is the page with the samples: http://www.ddde.de/enhance/ Both photos taken in Chongqing (China), one of the most heavily polluted places on earth. Image 1 shows the Yangtze river and there is heavy smog. To the left is the JPEG of the camera, to the right the best I achieved with the RAW converter. You can also download the original RAW file (compressed as RAR). The second image has actually already been optimised with the RAW converter, but you might still be able to improve it. This is unfortunately the typical situation in the east of China, where the skies are very often hazy and polluted. -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330, E400 and E500 forum at http://tech.groups.yahoo.com/group/MyOlympus/ Olympus E330 resource - http://myolympus.org/E330/ |
#16
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"Advanced" image processing
Greg "_" skrev: Not really photography at that point, more like image molestation-bordering on rendering. Yes, it is about impossible to draw the line, isn't it? How far you can go depends on what you want to do - do you want to show the facts as you saw them or just to use the picture as starting point? In any case, you start even before you press the shutter - by selecting what is and what is not in the picture. The camera or your computer adjusts things - the RAW is useless on its own. I have no problem with adjusting sharpness and colours, in in most cases cropping is fine too (can be dubious if you cut "unwanted" persons out). At the moment I am preparing a picure for a present. It is of a traditional Algarvian house to someone who likes the style of architecture - i.e. a representation of a type of house more than a specific house. I have no problem in removing power lines and TV areals(sp?), for this purpose I think it is ok. /Martin |
#17
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"Advanced" image processing
On Oct 31, 11:26 pm, Alfred Molon
wrote: Just curious if anybody knows techniques to substantially enhance images taken under bad lighting or weather conditions. For instance if you shot photos on an overcast, dark day, if there is a way to make these photos shine. Would it be possible to transform an overcast sky into a nice blue sky? Or if you shot images under hazy conditions, with poor visibility, would it be possible to give these images "vibrance", good contrast and colours and if so how? Are you asking for something beyond the sort of LAB processing done by Dan Margulis in "Photoshop LAB Color -The Canyon Conumdrum and Other Adventures in the Most Powerful Colorspace"? Figure 9.15 shows the use of LAB to get through the haze in Hong Kong. -- Barry Pearson http://www.barry.pearson.name/photography/ |
#18
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"Advanced" image processing
In article .com,
Barry Pearson says... Are you asking for something beyond the sort of LAB processing done by Dan Margulis in "Photoshop LAB Color -The Canyon Conumdrum and Other Adventures in the Most Powerful Colorspace"? Figure 9.15 shows the use of LAB to get through the haze in Hong Kong. Do you have a link? I've never tried this sort of processing. -- Alfred Molon ------------------------------ Olympus 50X0, 7070, 8080, E300, E330, E400 and E500 forum at http://tech.groups.yahoo.com/group/MyOlympus/ Olympus E330 resource - http://myolympus.org/E330/ |
#19
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"Advanced" image processing
Alfred Molon wrote:
In article , Ken Tough says... Why don't you put an example shot on a webpage somewhere, and challenge readers to do their best at improving the shot. It's a fun exercise. Ok, here is the page with the samples: http://www.ddde.de/enhance/ Both photos taken in Chongqing (China), one of the most heavily polluted places on earth. Image 1 shows the Yangtze river and there is heavy smog. To the left is the JPEG of the camera, to the right the best I achieved with the RAW converter. You can also download the original RAW file (compressed as RAR). The second image has actually already been optimised with the RAW converter, but you might still be able to improve it. How about this? http://www.wilderness-wales.co.uk/mi..._processed.jpg It was a rush job, just a couple of minutes in Photoshop. I could do much better if I started with the RAW file and took more time over it, but this is just to show what's possible in a couple of minutes. The banding in the sky is due to working on the 8 bit jpeg, this wouldn't happen with the 16 bit RAW file. I used; Levels - to set the black and white points Curves - to brighten the midtones. Contrast masking - to even out the image (actually I overdid this) Unsharp Mask with a huge radius (80 pixels) - to enhance the local contrast Saturation - just a touch to put a bit of colour back (the previous step tends to lose colour) Nothing I could do about the sky though. Much better results are possible though, if you're prepared to spend enough time on it, but at least this clears the haze. Paul -- http://www.wilderness-wales.co.uk |
#20
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"Advanced" image processing
Alfred Molon wrote: In article , Ken Tough says... Why don't you put an example shot on a webpage somewhere, and challenge readers to do their best at improving the shot. It's a fun exercise. Ok, here is the page with the samples: http://www.ddde.de/enhance/ OK here is my try at it http://www.pbase.com/konascott/image/69541142 Mine has a over processed feel to it and I have to say I like your version a lot better. This is pretty typical of what I can when I try to make a photo look like the day was nicer then it really was. Scott |
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