Here is the answer to the questions I asked in the little experiment that I posted earlier today. (see “Experiment #1: What do you see?” And, my apology for the formatting issue that may cause the image on this page to extend into the sidebar. This is the result of a modification to the web site made over a year after the original posting of this message. I have decided to leave the example images intact, with the side-effect of the odd formatting.)
Examples A and C are completely identical – two copies of the very same file. To be clear, there is literally no difference between them. One is a simple copy of the other file with a different name. Here is a 100% magnification crop from the source file used for A & C:

Example B came from a different source file. The blur was added to the original file in post, so it is uniform across the entire image both in the source file and in example B posted here. This source file was then converted to jpg in exactly the same way that the other file (e.g. – the other two examples) was converted. Here is a 100% magnification crop of the source image used for example B:

So, A and C are literally identical. B came from a source file that was so blurry that it looks like it was shot with a defective lens.
Thank you to all of you who took the challenge and looked long and hard at the sample images. I have three more little tests planned for sometime in the near future.
Dan

