Hyde Park, London by Night: GF1 HDR image
I've been slowly going through processing some of the images that I've taken with the GF1. At the same time I'm trying out photoshop CS5 - so I thought I'd post an image that I re-processed with the HDR-pro feature of CS5, after originally processing it and uploading from a single image on Istock.
The Istock version needed to be down-sized and had selective noise reduction applied to the because the full-size version just showed too much noise. This isn't so much a problem with the GF-1's micro 4/3 sensor, but more that the original was underexposed because it was the third image in a bracketed series, and the processing involved lifting some parts of the image by about 2.5 stops.
To see a comparison of the results from the 2 methods, have a look at the full post!
For reference, here's the first version on Istock:
The side-by side comparison shows some of the benefit of merging images to reduce noise. You'll notice that the images gain a significant amount of noise toward the bottom - the reason for this is that the foreground which was very close to black has been lifted considerably.
Neither image has had any Noise reduction applied at this stage!
Mergining
What do you mean with "merging image to reduce noise"?I always end up with a lot of noise in the HDR and the only way I found to avoid it is, apart to expose for the shadows, is to stacking and aligning the photos in layers underneath the hdr image like it's explained here:
http://www.stuckincustoms.com/hdr-tutorial-part-3/
what's your method?
thanks!
Andrea
Most noise in these types of
Most noise in these types of images is random noise. That means that if you take two successive identical images (separate image files), the noise in each will be different.
By stacking two or more identically exposed image files and setting the opacity of the top layers to about 50% each you end up with images that have less noise with no loss of detail. This gives more room to lift highlights and make adjustments than in a single file, and you can capture a scene with a larger dynamic range without resorting to photomatrix or having to blend differently exposed shots and getting unnatural looking results.
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