stair stepping / Alaising-Effect on 4K videoinput
Bodo last edited by Bodo
I have a 4K input (from panasonic lumix gh4) on a PCI decklink mini Recorder 4k / Win 10, i7, Quattro M4000, Isadora 3.8 there is a very visible stair stepping / Aliasing Effect on all the lines/boarder of the objects (even with full frame antialiasing on in the preference video tab) - as i want to capture a live drawing of an artist (and zooming in to the 4k quality) it is really a problem (alls the line of the drawing are stairs) if I switch to 1080p the problem is gone - anyone an idea how to fix this?
actually if I zoom close and it is real in focus i see the stair stepping-effect even in 1080p....
can you provide screen grabs to show what you are seeing?
Fred last edited by
Check you are actually getting proper 4k from your HDMI. The GH4 can output scaled resolutions over HDMI. Also check it with a 4k monitor to see if you have the same issues, also try make a recording with the blackmagic software and check to see if the recording has the same issues.
Try these instructions
@fred - Thank you very much I will try this!
@fred and DusX - attached a screenshot 1. Isadora capture and 2. media express recording under same conditions - there is the aliasing effect with Isadora and not with media express???
hi dusx - I did a screenshot of the effect I mean and a recording with media express (which does not has this effect) - any idea why Isadora make this aliasing effect with the incoming stream and media express not?
m_theater last edited by
i think that the internal scaling isn't working for you.
could you make a screenshot of the actual stage in 1920x1080, the floating preview window is not a good reference.
I think it would be worth to check how your 4k footage is presented on a a 4 screen, if you have non around you could emulate one with your quadro.
and check the difference in the screenshots.
from my point of view: if izzy is working correctly there shall be no influence apart from the yuv -> rgb transformation in the picture if you have a 4k camera / 4k processing / 4k screen.
if that is working correctly, perhaps you need a custom shader for a proper scaling
did you check your default resolution settings in preferences?
@dillthekraut - it is set to HD - should be 4k?
@m_theater thanx for reply - I will check this when I`am back in the studio we have a 4k Monitor there...