What features do I need to look at in a dslr for my abstract photos? What will give me good color capture?
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Simple answer: unless you are very, very demanding in your requirements, any camera with a reasonably large sensor (say micro 4/3s or bigger) and the ability to shoot in RAW will do you just fine. Don't worry about brand or comparing colour depth on DxOMark or anything like that - modern digital cameras are all good; the differences are much more about form factor and personal like or dislike of the interface than technical differences between the sensor or even the lenses.
Just get out there and start shooting rather than worrying about gear.
Interesting line of thought. The usual suspects - such as low light performance, color rendition, frames per second and so on - do not really apply in pure abstract photography.
The only constraint I can think of is that you will want to experiment with lens (it usually goes that the more the better). So Canon or Nikon, as these have the largest lens lineup. The exact model probably does not matter (so buy a cheap one).
If abstract photography is your game do give a thought to film also - long exposure pinhole images or photograms can look wonderfully abstract.