Can I blur images "the other way? In the compositor node editor, I have an image node -&gt; a blur node (Gaussian, X=100, Y=100) -&gt; composite node.
The unblurred image looks like this (There is a black square on a white background and a white square on a black background):

The blurred image looks like this:

Notice how in the blurred image, the white square is bigger than the black square. Is there a way I can blur the image &quot;The other way&quot; so that the white square is smaller than the black square?
With a little encouragement from @Rich Sedman, copied from comment:
The white square looks bigger, because of the conversion after compositing to sRGB for your display device. Arithmetically, inside the compositor, the squares are the same size. If you go to Color Management and switch the View Transform to 'Raw', you can see that.
You could use gamma correction after blurring in the compositor, to change that, but you would have to be be aware, that were you to use the squares for masking or suchlike, that part of the pipeline would become non-linear.