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On the front page, I do not understand explanation of 4:2:2 etc #83
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The sentence referes to the grid that is taken as a reference for chroma subsampling. When you say We had a discussion about chroma subsampling previously in #24, you might find useful reading it :) |
So the grid is not always 4 by 4 pixels? I don’t know why I assumed that but I did...
… 25 juni 2019 kl. 18:33 skrev Matteo Contrini ***@***.***>:
The sentence referes to the grid that is taken as a reference for chroma subsampling. When you say 4:*:* you mean a grid that has 4 columns and 2 rows (the 2 is fixed). So the y is the number of changes between the first row in the grid and the second row in the grid.
We had a discussion about chroma subsampling previously in #24, you might find useful reading it :)
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It's usually 4 by 2, with some uncommon exceptions like 4:1:0 and 4:2:1, according to Wikipedia. |
I may create sample images of how I understand the situation... but later in that case. |
The text says "y is the number of changes of chroma samples between the first and seconds rows of a pixels."
But isn't it more accurate to say:
"y is the number of changes of chroma samples between the first and last rows of a pixels."
If not, I still don't understand how chroma subsampling is used!
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