White pixels in render - why?
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White pixels in render - why?
daveso
Posts: 7,327
I believe the white pixels are caused by the lighting, but not sure. I used an HDR on this image. I like it a lot overall, other than the pixels here and there, and overall there are quite a few of them.
Why is that?
click on image to enlarge - check the eyes ... and then there are the obvious. but all over the image.
leem4 beardHD-2 black.jpg
1500 x 1875 - 1M
Post edited by daveso on
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How long did you leave it to render? They look like the typical artifacts of an uncompleted render
it rendered really fast ... but it was 100%. i think the time was around 30 minutes..but i have to use CPU. not sure if that makes a difference or not
The larger white areas on his skin look like a bit too much gloss for the lighting. Possibly true of parts of the beard as well.
However, the single "white" pixels scattered here and there are probably not white, but transparent. I've read in these forums that there is a known bug with SSS, especially when using Chromatic instead of Mono for the one setting, (the name is not coming to me at the moment.) The fix is to set Draw Dome to on, even if you're not using the HDRI for a background. "The fix" can be inconvenient occasionally, but for "inside" renders, it won't matter.
(I have not tested this to see if changing the Environment Mode to Sun/Sky or Scene Only gets rid of the transparent pixels.)
What's your lighting like? It looks to me a bit more like a camera headlight left on and shiny bits of the figure reflecting light right back into the camera.
BTW, the only difference between a CPU render and a GPU render is how long it takes. Assuming both renders run to roughly the same number of iterations, with the same render settings, they should both look about the same quality.
I'm rendering again..turned rendering environment to DOME only. Made sure headlamp was off. The light is https://www.daz3d.com/pro-studio-hdr-lighting-system-2
OK ..that render took around 5 minutes ... seems way too fast, but the same pixels are troublesome. The neck ones not quite as bad, but eyes the same. Perhaps if I turn upo the quality .. I will try that.
Did you also set Draw Dome to On? If not, and you still get those "white pixels", turn that setting to On and render again. Then compare. That way, the only difference will be the Draw Dome setting.
There is some glare on parts of the image, definitely a lighting plus gloss settings issue. However, in the full size image, you can see a sprinkling of single pixels that appear to be white. They are scattered lightly over most of his face with stronger concentration in some areas. The eyes, probably the cornea but affecting how the irises look; The collar bone on his right; The face and ear on his left; Possibly the beard on the chin; definitely the beard near the left ear.
@daveso, I see the image you uploaded is a JPEG. Did you save the render as a JPEG? I ask, because JPEGs do not use transparency, so the transparent pixels will have the white "background" added when you save. If you save the image as a PNG, you'll be able to verify the transparent pixels in an image editor. Just put a layer of color under the render and whatever color the layer is, your "white pixels" will become.
It could be that bug people have come into, it looks like that to me. A normal render would not be this unfinished unless you turned down the convergence or something.
Try turning the quality up to 3, and if that does not help, increase the max number of samples to 10 or 15 thousand.
It is odd as most of the picture, apart from the white dots, looks like the render finished, however I have seen that happen before.
i save as tif and then convert to jpg to upload.
BUT EUREKA ..i think/... wow..i changed light to a brighter one, and it reveals the problem..I'm pretty sure. serious high gloss on the model which i could not realy tell with the other renders
you can see the result here..the second image I turned the gloss of on the torso. You can see the pixels arew gone .. and what is happening to the head. This is only about a 6% render, but from rendering a few, the pixels are already apparent at this point.
Check the metal flakes setting. This is normally 0, but if set to high, it can cause issues. Also ensure there is no geoshell covering the character, the high gloss parts look like he is covered in a thin sheet of glass.
Disable the Noise Filter under Filtering in the Render Setting Tab. This will speed up your render and reduce noise. Not sure if it will solve your issue as there are many factors that could contribute to it, but it wont hurt to do this too.
its amazing how much you can learn just from one render. Now I'm playing with shutter speeds, vignettes, noise filters, and a ton of other stuff.
SOmetimes its hard to do this, as the render time to see results is pretty long, but for whatever, this character renders pretty fast, so its perfect to test things. less than 10 minutes for pretty good render complared to most I do that are pushing a couple hours.
this was 6.5 minutes ..about 85% ... pretty clean other than the tears at the eye bottom.