Hi.
Whenever I export a PNG with transparency, it comes out extremely grainy and with some weird contour around the objects. If I export the image with a background, it's a bit grainy, but not as much. The problem seems to be related to the transparency. I've exported tons of PNGs with alpha before and never had this problem. It started happening after the last update.
Here are two images. One was exported without the background and then superimposed over the background in an image editor. The other one (less grainy) was exported directly with the bg from iclone. Any ideas? 
Thanks.

The lower image is the one exported without a BG. The "Halo" effect is caused by Glow maps. You need to inspect the Materials of each item - I'm tipping that the Characters are the cause - and either remove the Glow map, or turn its strength to 0.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

I exported lots of the same characters and stuff and I never had this problem before. I get this with every single PNG I export, no matter what props or characters are in the project. I'll still try what you're suggesting, but I doubt that's the problem.

iClone now by default adds a noise effect to avoid color banding.

See manual: http://manual.reallusion.com/iClone_7/ENU/Pro/Default.htm#iClone_7/Pro_7.0/10_Scene/Effect/Using_Noise_Effect.htm, section called "Smoothing Color Band Visual Flaws".

Go to Visual > Post Effect and disable it.



As this is problematic for exports with transparency (this question has come up before), maybe it should not be on by default.

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Thanks animagic. That solved half the problem. Now when I export props I have no grain at all. However I tried it on a scene with characters, and even though I don't have any graininess in the transparency, I still have some weird "halo" around characters. This forum is amazing. I posted three or four questions this morning and had answers to all of them within minutes. You guys are amazing. I wish I could help around here as much as you do, but for now I'm a noob at this

The halo is, as Gerry says, a glow problem.  It doesn't matter if you actually have glow in your characters, as CC3 will put it in there (and I do believe iClone now does as well).  Just go in and delete those glow maps.

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley

There are no glow maps neither in CC nor iClone for any of these characters.

Can you post the iClone file?

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley

It's 316 Mb.

But can you post a link?  (There are lots of places to host for free, like Mega).

(In the meantime, try turning off GI and re-render and see what happens).

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley