On 2025-07-18 07:47, Mark Filipak wrote:
...I want to give
folks the opportunity to correct what I've written and to make additions....
OK, I'll bite.
In trying to follow along with this thread, i have had two difficulties:
1. not explaining the notation.
It's great that your message of Fri, 18 Jul 2025 10:47:01 -0400 has a
Key. That is a good start to explaining notation. But note that the
first symbol you use is "¤", which is not in your Key.
Also, you use terms like 4:2:2 and 4:1:1, without citing which notation
system you are using. I observe that the Wikipedia article on Chroma
subsampling mentions "schemes are not expressible in J:a:b notation.
Instead, they adopt a Y:Cb:Cr notation". Both notations look
syntactically identical. Which do you mean? When talking to an expert
like Poynton, maybe this all goes without saying. But when trying to
understand fundamentals, maybe it helps to be extra clear.
2. limiting yourself to character graphics.
You are attempting to communicate about two-dimensional arrays of
samples and loci. 2-D line graphics are a much clearer way of expressing
those concepts than are character graphics. I suspect that limiting
yourself to character graphics will limit your ability to express
clearly what you are trying to say about two-dimensional concepts.
Yes, making a line drawing is harder than making a character graphics
diagram. It requires using a different tool than a text editor, for a
start. But if you want to communicate clearly, maybe it is required.
Now I am not an expert, so maybe my difficulties won't apply between you
and Poynton. But this is my addition.
Best regards,
—Jim DeLaHunt
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