Aggregated greyscale statistics

[tokee]

At any given level of the folder tree, it would be interesting to know the top X darkest and top Y brightest images.

The numbers for the individual images are already there as .grey-files, they just needs to be collected.

[tokee]

An aggregated histogram for all images in a folder would be a nice extension.

[tokee]

The folder view now supports sorting based on dark and light spikes. This is not recursive though, so it works poorly for locating outliers in deep tree structures.

[tokee]

Since outliers in all stat types are potentially interesting, the full solution would require dynamic backend in order to scale properly with many files. Either the scope should be limited to a select few stats or the idea of aggregated statistics abandoned altogether.