In praise of AA filters

Started 11 months ago | Discussions thread
rovingtim
Veteran MemberPosts: 8,011
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Re: ready to see your artifacts?
In reply to crames, 11 months ago

crames wrote:

rovingtim wrote:

So, here we go:

1) purple tree phenomenon

Leaf-less trees are not this colour ... as you can see from the leaf-less trees in the foreground of your own image.

Hmm, why would aliasing be responsible for the purple color?

Because cameras with good AA tend not to do this, as per my link. What is your explanation that cameras without AA's tend to do this?

2) False detail

If you're talking about the pattern of the tiles on the right, it seems to be correct, parallel to the edges of the window covers. What detail do you see as false?

Seriously? You're proving my point in my original post. Well, the detail on the right is false. We know this because we can see the tile detail at other angles is the same and makes sense if you know how tile roofs are built.

Notice how the detail on the roof suddenly changes as the angle changes. This is detail being invented out of whole cloth. There are lots of examples of this in your image.

Invented detail? On the left it seems to be the actual tile pattern at the edge of detectability.

Except ... it's the same pattern as the false detail on the image above ... and the false detail even follows through on the corner trim as if the corner trim was solely created to match the 'proper' detail on only one side of the roof that you say is within Nyquist. Funny that.

On the right the pattern is not resolved - above Nyquist, apparently, and not showing up as aliasing.

Sure.

3) Jaggies

Yes, jaggies there. Could be due to sharpening.

How does sharpening produce jaggies?

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