Remediating Grain
I made this image a couple of months ago, at dawn, using a 600mm lens and a film speed of 3200. The apparent grain is larger than ideal. I use darktable to process images because it's a) free and 2) works on Linux (2 is more important). Like Adobe's lightroom, darktable can process grain.
Mother and Fawn, denoised
This image, processed with a parametric denoising algorithm, using wavelets for the convolution, is much smoother. It takes a careful adjustment to trade off between smoothness and loosing image detail. The image below has a patch from both the original and processed.
Mother and Fawn, for direct comparisonA patch from denoising on top of the original
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© Robert Harrison, Photography