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Better quality with image stacking
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The fly picture is made with a slightly different technique ... by combining the sharp parts of several photos that have their focal points set at different distances. I'm guessing the program uses sharpness/contrast data to generate much more precise masks than a human could. Besides why do I have to defend these things ... the information is there ... just read up and try it out for yourself if the thousands of images on the net don't satisfy you. Anyway ... back to regular image stacking. I did some real life testing. Canon 400D with 70-200 f4 L in low light @ ISO 1600 @ 200mm and 1/4s exposure from distance of 4.5m from the boring empty plastic bottle... I made 256 images such as these: example 1 - 100% crop [img]http://www.kaarellumi.com/asylum/stack/varska_source_example1.jpg[/img] example 2 - 100% crop [img]http://www.kaarellumi.com/asylum/stack/varska_source_example2.jpg[/img] I used Photoshop CS2 to combine the images with "Load Files into Stack..." script (auto align on) and stack mode set to "Median". Result: [img]http://www.kaarellumi.com/asylum/stack/varksa_result1.jpg[/img] "Zoomed in" at 900% with "Bicubic Smoother" [img]http://www.kaarellumi.com/asylum/stack/varska_result1_zoom.jpg[/img] The focus could have been better if I had been luckier but 400D isn't known for it's good low light focus... As you can see there's quite a bit of information in the resulting image that would have been impossible to extract from any of the source images ... of course it seems pretty obvious since what it all comes down to is just artificially elongated exposure ... the important bits are: aligning the images perfectly and then combining the images with an average or median function which ultimately improves the signal to noise ratio. [small](Edited by [url=http://www.ozoneasylum.com/user/3736]Arthurio[/url] on 08-30-2008 23:48)[/small]
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