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Maxunderground news unavailable

huge render gradations problem
show user profile  joelr
hello all,

im rendering huge renders for printing 120x150 cm prints.
im getting some problems of gradation in the shadows of my render.
has anyone seen these kind of problems before?
is it because im prerenderin the irrediance and light cache maps on half the size of the finished render?

any help will be great,

thanks,
Joel



read 783 times
6/3/2010 11:22:12 PM (last edit: 6/3/2010 11:22:12 PM)
show user profile  gogodr
save in png-24 or TGA and see if you have the same result ?

Hello there

beautiful ;3


read 767 times
6/3/2010 11:46:37 PM (last edit: 6/3/2010 11:46:37 PM)
show user profile  joelr
It was originaly rendered to tif.
Only saved to jpg for the forum



read 755 times
6/4/2010 12:09:02 AM (last edit: 6/4/2010 12:09:02 AM)
show user profile  killerbee2
if you cant rerender, add some noise,
if you can render, render it to a floating point format




read 740 times
6/4/2010 3:39:41 AM (last edit: 6/4/2010 3:39:41 AM)
show user profile  Dub.
render to 16bit/c TIF and add a little bit of noise in photoshop.

8 bit/c (24bit) is not enough in this case to prevent banding.


read 721 times
6/4/2010 8:35:32 AM (last edit: 6/4/2010 8:35:32 AM)
show user profile  joelr
thanks dub,

that helped out. although i tried adding noise in photoshop and didn't see any difference, but saving as 16bit, then lowering to 8bit did the trick.
its not perfect, but much better then before.


joel



read 704 times
6/4/2010 1:16:51 PM (last edit: 6/4/2010 1:16:51 PM)
show user profile  STRAT
i wouldnt add noise, i'd add blur





SJLEWORTHY.COM











read 702 times
6/4/2010 1:17:43 PM (last edit: 6/4/2010 1:17:43 PM)
show user profile  BishBashRoss
In photoshop switch to 16bit add noise then blur and switch back to 8 bit sometimes helps.





read 699 times
6/4/2010 1:29:18 PM (last edit: 6/4/2010 1:29:18 PM)
show user profile  joelr
thanks guys,


il give it a try after i render the image again.
these are huge renders, and in 16bit it comes out as a 1gb files...



read 692 times
6/4/2010 1:46:05 PM (last edit: 6/4/2010 1:46:05 PM)
show user profile  HateTank
It's called banding, and the only way to properly get rid of it (without loosing detail by blurring) is, as suggested, save as 16/24/32 bit (.exr) and convert it back.

You may be able to:
1. convert your final comp to 16 bit,
2. copy merged and paste that to a new layer,
3. then convert back to 8 bit.
This usually also does the trick.

*edit* I should probably elaborate. Sometimes when you color correct and level adjust and whatever it is you do in post, you'll get this as well - maybe you cranked the contrast up high, compared to the information stored in the original render?
In any way the process described above ahould be applied as the absolute last step of the post process. I've probably done it on about 100 renders over the last 2 years - give or take ;)


CHeers


Nick Jensen
Polygon wrestler - Rockstar

Fusskalt


read 687 times
6/4/2010 1:55:43 PM (last edit: 6/4/2010 6:03:36 PM)
show user profile  joelr
my problem is much worst as you described tank, because im taking the white background with shading on it, and applying hue and saturation in photoshop until it gets colored to a full color, like orange, but still with shadows.
i haven't changed the color of the floor in max because im rendering in vray and i didn't want the gi to return color to my objects on top of the floor.
if i had known before hand of these problems i might have taken different steps, but i did small test renders and of course had no problems, and only after doing these huge renders all night, with a lot of time constraints, i found these problems.
anyway, ill try and fix it as much as possible.
thanks guys for all your help and info.

joel



read 657 times
6/4/2010 9:14:56 PM (last edit: 6/4/2010 9:14:56 PM)
show user profile  parkerfamily
if your only rendering greyscales, you should definitely take a look into quicksilver, it renders 16k x 16k clays in 30 seconds tops for me. long as your not doing anything tricky with the floor you know.
read 628 times
6/5/2010 6:22:19 PM (last edit: 6/5/2010 6:22:50 PM)
show user profile  joelr
well, only my floor is grayscale. the rest of the render is full colors.
anyway, i used the noise and blur methods as suggested before, and im getting some weird results...

here is the original render:
here it is after applying very little noise:
and here it is after adding some blur:

the images look better originally, but i reduced them to jpg lower quality

it seems as if after adding blur the banding comes back to life
very weird...

anyway, i just used some noise to eliminate the banding and it worked out just fine.

Joel



read 622 times
6/5/2010 9:04:49 PM (last edit: 6/5/2010 9:05:52 PM)
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