That's not quite what I meant. Look at the histogram here:
You see the background is still mainly dead featureless black, the maximum the base screen colour will allow. But it's still only the base screen colour and not black. So if someone is looking at the image with a screen that has a base colour that's slightly lighter than your's then what difference do they see? None really because you're just scaling the tones into the range available in the display medium, everyone will see this as black even if it is not as black as the black you see on your screen (which is not black either but just the base colour of your screen).
So allowing that viewers will perceive the darkest tone as black even when it is lighter than you see do you really think that the black you achieve on your image is in any way absolute? If not then why reduce it to a level where it can't display any hint of texture? If you reduce the luminosity to zero then there is no texture and that part of the image then becomes subtly different to the rest that does display texture. Now given that some other viewer sees a lighter black in the same way you see your black would there not be some lee-way in tone rather than thinking of black as absolute, (which it clearly isn't, it's just the base colour of the screen)?
Then would not a lighter black look the same as your other viewer's black, but still be light enough to hold a little texture?
Here is a histogram of one of my images:
Posted here:
New toy
Now admittedly I could make it more black and that there is a noticeable variation in the black, but do you not see the top left background as black? And do you not also see in the bottom right a deeper black against this black background? Black is relative and within reason is really only the darkest tone you show. If you post a reply look closely at the "Post Reply" and other buttons because they're actually 22% brightness, well off zero. What I'm trying to say is that the web site is designed not to compete against your images by showing a deep 'absolute' black. Anything you post lower than that will look 'more black' while still holding a hint of tone and texture.
Black (as is everything in an image) is not absolute, use it to your advantage, (while also going for the prize of the maximum use of the word 'black" in a post).
