Spot the odd ones: filter or no filter ?

The use of filters, HDR, cropping and cloning tools is often debated in street photography. Should the documentary aspect of street photography prohibit any manipulation...
The use of filters, HDR, cropping and cloning tools is often debated in street photography. Should the documentary aspect of street photography prohibit any manipulation made by the photographer in post-processing? There is no simple answer to that and most of the time, viewers can't even distinguish when manipulations are made. For example, could you tell which of the following pictures had a filter applied to it ?  (click on pictures to view them in high res) 1 2 q 3 4 I'll provide the answer in a couple of day in the comments' section.