Not see it, no. I could describe it, from memory, if I had looked at it for long enough and paid enough attention (especially if I knew beforehand I'd have to describe it), but obviously I wouldn't be seeing it. There'd be no image, just a memory.

I'm pretty certain the visual processing parts of the brain are not involved when I imagine or remember stuff.

I mean, there's a lot of image processing going on in the retina and optic nerve (edge detection, contrast highlighting, and whatnot) that's obviously not available when not using the eyes (which makes it very hard for me to imagine how this seeing images in your brain thing works), then a lot of spatial and temporal signal processing (motion detection, noise reduction, speed classification, and so on) in the thalamus, then there's several layers of visual cortex doing the rest of the image processing, pattern recognition, and whatnot, and then there's the rest of the brain (mainly prefrontal cortex and parietal and temporal lobes), which actually deals with that information, stores it, recalls it, and whatnot.

I imagine the whole retina-thalamus-visual cortex bit isn't significantly involved in the way I "visualise" stuff, while it might be more involved for people who "see images" in their brains.

All the processed stuff (concepts, descriptions, dimensions, spatial and temporal relationships, and whatnot) is still there, though, just not the raw visual data (which would be superfluous in most cases anyway, unless I was trying to do something like recall a written page I hadn't read in order to read it later, which I can't do but you or someone with photographic memory might), so I've got everything I need anyway.

I couldn't possibly remember specific apples.

I could describe to you the Granny Smith variety (the only one I like), or maybe the Golden or Gala (the other varieties common in supermarkets around here), but not particular apples, unless I had actually tried to memorize their details (which would look like a list, not an image).

Maybe I don't care enough about apples.

I could describe my old pets (I did care enough about them to remember them), but, again, that'd look more like a list.