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General Photography
HDR
Playing with a 3-Exposure HDR Series
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<blockquote data-quote="BackdoorArts" data-source="post: 292199" data-attributes="member: 9240"><p><strong>Comparing Images 1-4</strong></p><p></p><p>The first 4 images are very, very similar, with almost no discernible differences between them. Here's a side-by-side-by-side composite of the 4...</p><p></p><p></p><p>[ATTACH=full]83000[/ATTACH]</p><p></p><p>The differences are very faint and can really only be seen when you bounce back and forth between them in Lightroom. So, how can I show that physically? I decided to open them as Layers in Photoshop and use the Difference blending mode, which essentially compares the color content of each pixel by dividing one color value by the other and displaying the result. Identical layers would produce a completely black image. I chose to use Difference instead of Subtract because the differences were more apparent (when I used Subtract they were almost completely black and barely perceptible at this size). In each case the image is compared to Image 1.</p><p></p><p></p><p>[ATTACH=full]83001[/ATTACH]</p><p></p><p></p><p>As you can (hopefully) see, there is very little difference between the original and images 2 & 3, and slightly more in image 4. Images 2 & 3 are actually nearly identical, which I would almost expect since they were both multi-image HDR series sourced from the same single image. Image 4, however, starts to lose some saturation and color, which is likely due to the limitations of using a single image in a tone map. Still, it's very close and could likely be tweaked until it's nearly idential.</p><p></p><p>What this tells me is that, all other things being equal, a 3 image bracketed HDR produced from separate images doesn't necessarily give you any substantial advantage over a single, well exposed image provided that the image does not lack light information at either end of the histogram. In other words, just because my image looks like this...</p><p></p><p>[ATTACH=full]83002[/ATTACH]</p><p></p><p>...it doesn't mean that I have to shoot a bracket series and go HDR to make the photo I want. It should be noted, however, if I am blowing out one end or the other of my histogram on the metered exposure then I will <em>need</em> to bracket exposures if I want to capture all the available light.</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 292199, member: 9240"] [B]Comparing Images 1-4[/B] The first 4 images are very, very similar, with almost no discernible differences between them. Here's a side-by-side-by-side composite of the 4... [ATTACH type="full" width="60%"]83000._xfImport[/ATTACH] The differences are very faint and can really only be seen when you bounce back and forth between them in Lightroom. So, how can I show that physically? I decided to open them as Layers in Photoshop and use the Difference blending mode, which essentially compares the color content of each pixel by dividing one color value by the other and displaying the result. Identical layers would produce a completely black image. I chose to use Difference instead of Subtract because the differences were more apparent (when I used Subtract they were almost completely black and barely perceptible at this size). In each case the image is compared to Image 1. [ATTACH type="full" width="60%"]83001._xfImport[/ATTACH] As you can (hopefully) see, there is very little difference between the original and images 2 & 3, and slightly more in image 4. Images 2 & 3 are actually nearly identical, which I would almost expect since they were both multi-image HDR series sourced from the same single image. Image 4, however, starts to lose some saturation and color, which is likely due to the limitations of using a single image in a tone map. Still, it's very close and could likely be tweaked until it's nearly idential. What this tells me is that, all other things being equal, a 3 image bracketed HDR produced from separate images doesn't necessarily give you any substantial advantage over a single, well exposed image provided that the image does not lack light information at either end of the histogram. In other words, just because my image looks like this... [ATTACH type="full" width="60%"]83002._xfImport[/ATTACH] ...it doesn't mean that I have to shoot a bracket series and go HDR to make the photo I want. It should be noted, however, if I am blowing out one end or the other of my histogram on the metered exposure then I will [I]need[/I] to bracket exposures if I want to capture all the available light. [/QUOTE]
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General Photography
HDR
Playing with a 3-Exposure HDR Series
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