[ptx] Re: Does enblend impairs quality?

[Chris]

Hi,

> I recognized from other work with enblend, that 'enblended' panos are
> very sensitive against sharpening. So I sized both complete panoramas

On the first picture, I see so, that the enbedded version is sharper.
Perhaps, enblend make a bit sharpening, not deliberately, but as a
result of its algorithm. It could be a reason, why it is more sensitive
for later sharpening.

> down and sharpened them with the same values (done with fixfoto, does
> something like the 'unsharp-mask-method') and saved them as jpg with a
> compression of 98%. This is nearby my usual workflow for panos, I put on
> my webpage.
> 
> Maybe some of you are interested:
> http://www.panoclub.de/gallery/enblend_quality
> I would be happy about some feedback or about your experiences on enblend
> quality.

There are obvious stitching mistakes, where the enblended picture is
smoother, therefore better.

I think, to test enblend it would be enough to blend only one single picture.
No panorama, just an original photo: enblend -o e.tiff o.tiff, then
make a substraction. If enblend lose no information, the two pictures
should be the same. If anything changes (noise or the other way,
smoothness) then it is enblend's error. Regrettably I couldn't try
it right now :-).

Chris