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DAZ 7 - transparency issue

DavemanDaveman Posts: 51
edited November 2014 in New Users

Since installing the newer DAZ 7 - when I render the lone figure with no background as a PNG file - I end up with a kind of a dotted halo around the figure - and the background is not rendered transparent. I need it transparent to overlay another image. The new render tab (sub tabs) have me confused.., but here is a sample of what I am talking about...,

BROKEN_-_TEST.png
433 x 498 - 144K
Post edited by Daveman on

Comments

  • TotteTotte Posts: 14,094
    edited December 1969

    In 4.7, if you don't set any background as environment (render against the checker board pattern), the image should have an alpha channel when saved as .png that is correct. are you sure that the problem isn't the white wash overexpose on her back that looks like a halo?

  • DavemanDaveman Posts: 51
    edited December 1969

    When its rendering it shows the clear checkerboard. The final render when I overlay the image I get spotted halo like line around her - I tried to smooth it with the smoothing brush but pretty much defeats the desired effect. It carries over on the under-lit side of her. Before in 4.6 I had similar renders without that halo effect.
    My graphics card (if that has any bearing) is a Radeon HD6570 with 1GB dedicated DDR3 ram.
    system info:
    AMD AThlon II Dual Core 3.0 Ghz
    OS: Windows 7
    4GB DDR 2 desktop memory

  • Richard HaseltineRichard Haseltine Posts: 102,741
    edited December 1969

    I admit my eyes are past it, but the only effect I am seeing is the anti-aliasing, which is correctly coloured to match the model colour so that it blends in without haloing. If you are used to rendering against a dark background colour, which would mix that colour with the anti-aliased edge pixels, then it may seem as if there's a more visible halo but in fact what you have is more "correct" for compositing.

  • DavemanDaveman Posts: 51
    edited November 2014

    I cropped and resized this image - so yeah I think thats why its not as evident here.., I will post the full size and PRAY I dont get in trouble for posting that large a file, and see of the Dotted Halo is more evident... right here..., You may have to copy it and try to overlay on any darker image and see the halo. If it doesnt appear to you then I dont know whats going on. But here - I dont see it at all - just in my GIMP and Paint Shop Pro

    BROKEN_-_b.png
    800 x 800 - 149K
    Post edited by Daveman on
  • Richard HaseltineRichard Haseltine Posts: 102,741
    edited December 1969

    What I see, as shown in the cropped enlargement below, is the effect of the anti-aliased edge - the geometry passes through those pixels, but doesn't full cover them, so their colour is that of the rendered surface but their opacity is reduced to reflect the amount of the pixel that is covered. That's what is meant to happen - in previous versions of DS not only would the opacity be reduced but the background colour would also be mixed in, causing a haloing effect if the render was layered over a differently coloured ground. If you want that, make sure you have the opacity saved as a mask or channel, drop the render onto a plain layer filled with your usual background colour, then use the mask to select it and copy to a new layer.

    AA_effect_along_edge_of_object.JPG
    502 x 559 - 26K
  • DavemanDaveman Posts: 51
    edited December 1969

    What I was experimenting with is to have a ghost effect hence the overlay. Yeah I cant see the dotted halo I mentioned here in the cropped close up at all. I've rarely used overlays at all so its a relatively new game for me. I'll play around with it some more and watch some YouTube tutorials on masking with GIMP. My Paint Shop pro is seriously outdated (5.1 i think). Thanks for everyone's time and help. I am always appreciative

  • Richard HaseltineRichard Haseltine Posts: 102,741
    edited December 1969

    If you can't get to the bottom of it perhaps you could post an image similar to mine showing what you are seeing - I zoomed in in my image editor and then used the Windows Snipping Tool to extract a segment.

  • DestinysGardenDestinysGarden Posts: 2,550
    edited December 1969

    I admit, on my computer at work, I was seeing a pixelated halo around the image. It looked like stray jpeg artifacts. But all images on my computer at work get a pixelated halo (not getting into that here).
    I put your image on an multi colored gradient in PaintShop Pro. I think it looks great. Yes, if you zoom into 800% you see the anti-aliasing edge that is supposed to be there, but if there was a color halo at all it, would be very evident on a background like this one.

    broken1.jpg
    452 x 521 - 96K
  • DestinysGardenDestinysGarden Posts: 2,550
    edited November 2014

    Here is an example of what we used to get when rendering with transparent backgrounds, and I can tell right away I had my background color set to black at the time. Your figure is not doing any of this at all.

    broken2.jpg
    425 x 622 - 99K
    Post edited by DestinysGarden on
  • 24_Seven24_Seven Posts: 31
    edited December 2014

    Please delete this post. Sorry about that.

    Post edited by 24_Seven on
  • TotteTotte Posts: 14,094
    edited December 1969

    That looks more like video compression artifacts.

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