Recently I noticed that there is a clearly visible jpeg square pattern recognizable in orthophotos.
As far as I can tell, it is not too bad in the texture files, so it must be inherent to the process of creating the orthophotos.
I exported them as png, so there should be no squares at all.
That tells me that quite some jpeg compression must be used in the process.
How can I avoid that?
Hmm, on closer look it doesn’t seem to be caused by jpeg since the size of the squares varies.
The effect is similar though and I would rather do without.
It seems to be more visible in places with dark colours and irregular texture-pattern.
*PUSH*
HELLO?
Hi Götz Echtenacher
In what application are you opening the data ?
Hi Wishgranter,
the screenshots are made with Photoshop Elements 12, but they look the same everywhere, be it within RC, Gimp, Windows Viewer…
I just rendered the same orthophoto (which had 0,002 m/px) with 0,000516 (estimated) and it was much better, even viewed with the same pixel size. Otimal texel size in unwrap is 0,000682 m/px. Could it be some kind of moiree effect?
So is this a real issue or am I counting peas?
So nobody any clue?
Hi Götz Echtenacher
If you export the same ORTHO as TIF or PNG get the same issue ? look like JPG artifacts ( 8 x 8 pix kernel ) and it can be just a coincidence that is so visible…
Hey Wishgranter,
that’s the thing - IT IS PNG !!!
Even better, my sample is a screenshot from RC.
But exactly the same in the exported PNGs…
I also thought jpeg artifacts but they are not regular enough.
And you are right, it is especially visible in this example (I noticed it there) but once you know what to look for you can see it in all the orthos. And since my projects are so different, I use different cameras etc. I don’t think its on my end… 
Hi Götz Echtenacher
Can you send the images and RCPROJ data ( with the ORTHOs ) for inspection ?
Hi Wishgranter,
10 GB equals 3 months of my bandwith (I believe)… 
I might try and put a small portion together, but not sure if I get around to it.
It’s not a problem per se because it’s not relevant when looked at with the native resolution.
I’m just curious.