Are humans or computers rejecting the contributions?
I have successfully uploaded, and had accepted, hundreds of images - but I have also received quite a few rejections that would appear to be incorrect or in error.
If I upload a portrait image that has a model's eyes critically sharp but the background rendered blurred by the f/1.4 aperture. I then receive a rejection because my image is 'blurred' - well yes 90% of the image has beautiful 'bokeh' - which my commercial clients usually describe at 'the professional look'. Likewise I get images rejected because of copyright, because there is some graffiti on a wall that is actually art in a public space and not product branding. As Melbourne's alleyways are famous for its prolific street art it makes uploading potential travel photography images (that would be in demand by travel agencies) captured in my home city a complete nightmare.
I have therefore, and regretfully, come to the conclusion that no human at Adobe is actually looking at my uploaded images. I believe a computer is rejecting them because it finds a word or determines that there are no sharp edges in the majority of the image surface.
This will essentially devalue Adobe Stock as a useful stock resource if users cannot find images that have certain qualities (bokeh) or subject matter because a poorly programmed computer is rejecting them.
