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Originally Posted by Stephen R. Savage
It does not matter if it is the same.
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I'm saying horizontal first vs. vertical first is not the same. It's just an observation
You said "See how there is no "problem" in "c"? "
In this example, there is a "problem", or at least a difference. In this specific case, the bars at the intersections don't even line up when you resize height first, or if you do it "normally" . I would expect "doing it normally" in z.lib would be = resize height first, but that isn't the case here either.
ie. there is a difference between resizing horizontal first, vs vertical resizing. They do not produce bit identical results. ie. They are not the same. In this specific case, it happens that resizing horizontal first is clearly better . That might not be true for other cases. But clearly there is a difference.
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If you use "core.register_format(vs.YUV, vs.FLOAT, 32, 1, 1)" as the intermediate, everything is bit-exact. But it doesn't matter to begin with.
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No difference here. Maybe you're using a different version ?
EDIT: or did you mean just using float as the intermediate e.g. YUV444PS - in that case yes, all 3 cases are identical . Then your point about rounding errors makes more sense