01-10-2015, 03:29 AM
Regarding the two open source raw processors I mentioned... both are developed by a single person (at least ImageJ still is, to the best of my knowledge).
Regarding distoriton, vignetting, etc. "internet photographers" and enthusiasts in general are an interesting point of discussion. There are a couple of generally applicable targets that we like to shoot for when designing lenses. If a lens is being designed for a specific sensor a comon goal is MTF > 50% at the nyquist frequency of the sensor. Additionally, distortion is typically set to be "simply" less than 4% if controlling it is not a specific goal, as it is at about that level that the human eye begins to notice in most scenes. Regarding vignetting, it depends on the maximum aperture but for "common speed lenses" - slower than f/2.8 - the general target is to have at least 40% of the center brightness in the corner. In the f/2.8 to f/2 range we like to see at least 25% illuminance in the corner. At apertures faster than f/2 one might accept as low as 15% or even 10% illuminance.
Of course often we work to do better than the vignetting and distortion guideline, but in general you have a "bad" design if you fail to control one better than that.
I can't really comment on asset management stuff, as I do not shoot images in sufficient volume to need a DAM program.
Regarding distoriton, vignetting, etc. "internet photographers" and enthusiasts in general are an interesting point of discussion. There are a couple of generally applicable targets that we like to shoot for when designing lenses. If a lens is being designed for a specific sensor a comon goal is MTF > 50% at the nyquist frequency of the sensor. Additionally, distortion is typically set to be "simply" less than 4% if controlling it is not a specific goal, as it is at about that level that the human eye begins to notice in most scenes. Regarding vignetting, it depends on the maximum aperture but for "common speed lenses" - slower than f/2.8 - the general target is to have at least 40% of the center brightness in the corner. In the f/2.8 to f/2 range we like to see at least 25% illuminance in the corner. At apertures faster than f/2 one might accept as low as 15% or even 10% illuminance.
Of course often we work to do better than the vignetting and distortion guideline, but in general you have a "bad" design if you fail to control one better than that.
I can't really comment on asset management stuff, as I do not shoot images in sufficient volume to need a DAM program.