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lens help v.imanoob
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17-12-2008 2:05pm#1
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If you'll forgive the liberties I took with regard to manipulating your photgraph:
The image is overexposed.
Look at the histogram for your image:
The large spike of data on the right hand side means there is a lot of information in the image that is very bright (most likely the blown-out sky).
The hump of data in the middle represents most of the information in the image, this is normal.
The left hand side, however, is devoid of any information, this means no part of the image is considered dark or black.
When Photoshop's "Auto Levels" feature is applied to the image the result is this:
and the resultant image's histogram is this:
Notice how the graph is now spread more evenly across the breadth of the histogram. The information gathered by the sensor is now being used across all brightnesses, giving you a wider range of contrast.
Auto Levels is a quick and dirty fix for this and more extensive play with levels and curves may improve it further but here's only so much that can be recovered in post processing. Any data that would potentially exist beyond the left or right hand side of the histogram is recorded as black or white, respectively. For example: the spike on the right hand side seems to extend beyond the boundaries of the histogram, if you were to reduce your exposure you'd most likely see that data moving to the left of the histogram and becoming useful, this would probably cause much of the foreground to darken and give the sky more detail.
Histograms are useful tools for checking you have exposed correctly. As a rule of thumb: histograms should have bell shaped graphs, indicating the majority of recorded information is present in the midtones and only a small portion present in the very dark or very bright areas. Unfortunately this is not always possible due to the limited dynamic range of digital cameras and you will often have to make creative choices about what data to sacrifice, e.g.: in your photograph, you probably would rather the sky was blown-out and detail-less rather than the foreground be too dark.
According to this your camera can show you histograms of images you've taken. I suggest you review these to tell if your image has been correctly exposed and re-take as necessary.
Histograms are an incredibly useful tool for learning and thinking about exposure and knowledge of one will most likely preclude the other. I suggest you learn about both.0 -
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Picasa can do this for free by the way
downloading now, been up for the last 26 hours so i wont really be able to mess around with it untill tomorrow but ill give it a try now with a couple of pics to see how they turn out
just using the im feeling lucky option on it has made my pics alot better looking lol0 -
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