Messages

31

[Max] General Discussion / Re: corona vfb v image in photoshop

« on: 2019-09-26, 19:46:24 »

much appreciated Juraj, i think i am actually getting somewhere now.

So I have used the OSD To set it to CAL1, monitor is about 5 yrs old :-( these were well priced monitors  for what they offered.

it just bypasses what OS is doing and cut offs colors outside of calibrated color space.

There is also a Dell Display Manager that allows profiles and screen layout to be set, I have set that to CAL1 also (this was set to auto, which would probably explain that when i ran windows media player the screen would get darker as it was an unmanaged app) image attached,
setting this to CAL1 in manual mode seems to apply this LUT to everything e.g. browsers etc. which is ok - it just looks a tad yellow,
If that is all i need to do with the monitor,  in Photoshop should i set to use the sRGB profile or the dell's profile as shown in image?

You can then set Photoshop to either ignore color profiles

   i.e. set 'Colour Management profiles> RGB to 'Off' ?
cheers

32

[Max] General Discussion / Re: corona vfb v image in photoshop

« on: 2019-09-26, 18:25:50 »

It doesn't matter what you save from 3dsMax (8/16/32bit, any file format), because the software isn't color managed as a whole and neither is the image exporting process (regardless of renderer).

Unless you "clamp" your color-space of monitor to low-gamut sRGB by 3DLUT in monitor's OSD (Hardware calibration), what you will see in 3dsMax will always be incorrect (oversaturated because it spreads to the whole gamut).

dell u2713H OSD gives 4 options , Adobe RGB, sRGB, CAL1, CAL2, sRGB is checked, how can i do that ? is it via the OSD?

Photoshop by default is color managed so what you see is correct, unless you attach incorrect color-profile (monitor one or general wide-gamut).

So should i set PS Colour settings to dell's monitor specific profile,  srgb or AbobeSRGB

Here are two only current possible solutions if your monitor doesn't feature hardware color management and you like to keep wide-gamut:

1) CORRECT colors: You import your file in PS and simply live with the fact you can do final color evaluation in post-production. The saturation in 3dsMax will be wrong and you have to think about it.
2) WRONG colors, but identical image transfer: If you want the SAME (WRONG) colors like you see in 3dsMax on wide-gamut monitor, you have to attach the same color-profile your monitor is using. This will give you wrong colors (you aren't converting between color-spaces but simply transfering the same values). You can then convert to sRGB when sending it to clients or uploading to website.

if i opt for second option here, does this mean i set Photoshops Colour setting>working spaces  to "Dell's u2713H profile" ?

sorry for dragging this on but its a complete head wreck

33

[Max] General Discussion / corona vfb v image in photoshop

« on: 2019-09-26, 14:58:45 »

apologies as I know this has cropped up before but I just cant seem to get this fixed,
attached image is difference in Coroana's FB and the image opened in PS (when Ps is set to SRGB profile)
I was probably incorrectly using Monitor RBG in PS as the proof setup so switching that to Internet Std srgb causes a massive difference in Corona FB and PS

reading Juraj's replies here https://forum.corona-renderer.com/index.php?topic=13592.0
am i right in saying that framebuffer is wrong as it is oversaturated due to FB is non-colormanaged

What i have tried as a fix
save image from corona VB as a CXR, OPEN cxr in Corona image editor and save out as PNG,
Have photoshop's colour settings set to  monitors i.e. the Dell U2713
So when i open image (saved out of Corona'S FB as an ) in PS i will get a noticeable difference, To get the image looking similar in Photoshop I set the if i save that out for say a web image (convert to srgb is ticked)

appreciate any info,


max 2018 , gamma set to 2.2
monitor Dell U2713H - set to auto,

34

[Max] I need help! / looking for general info on CFB when doing animation

« on: 2019-04-01, 19:32:18 »

Hi, I have swapped form Vray to Corona and love the lightmixer, I have a couple of basic questions on Corona workflow.

please advise if my understanding is correct using the following example:
e.g. I have a studio scene with a few lights in it and when rendering I tweak the lightmixer to get the desired look, so within the CFB the only image I am interested in is "filename_Lightmix" as the beauty pass looks nothing like what I want so I wont spend any time on it in post.
I save out the lightmix file as a cxr or png and do some post work on it. job done??

If I am rendering out an animation using 'camera_1' I need to save all the lightmixer light passes (via render elements), 3DMax will save out the beauty pass from the 'render output>common>filename' but again its the Lightmix images i am interested in and not the beauty pass so I ignore these beauty passes.
If I want to render a different camera angle (using "camera 2") of the animation i need to make sure i change name to "filename_Lightmix_'camera_2"  so it doesnt overwrite the original  "filename_Lightmix_camera_1"

hope this makes sense
Thanks
T

35

[Max] I need help! / Re: Seems noise level is higher in region of room (internal render)

« on: 2019-01-29, 16:11:44 »

aghhh, basic error,
I had a bump on the wood panels but turned it off, but had two mat slots with same mats in them one with bump unchecked the other bump enabled, this happened as i imported objects from the kitchen scene
 looks much better now :-)
cheers

36

[Max] I need help! / [solved] Seems noise level is higher in region of room (internal render)

« on: 2019-01-28, 18:33:42 »

sorry i know noise is a constant bane of our lives and usually the denoiser does its job, but for some reason i have an area of the room that the denoiser seems to be less effective, i have checked and the material is the same on the panelling,
The region circled red left of the fireplace is fine, but the right side is pretty noisey
any ideals ?
I'm using R2.0.
cheers

37

[Max] I need help! / using Neatscatter droplets on bottle- memory probs

« on: 2018-10-29, 14:27:39 »

Hi Folks
I am using Neatscatter to place droplets on a bottle,
it renders in Vray and makes the droplets instances, Droplets do not render in Corona unless i convert to mesh or instances, I am familiar with Vray proxy and its great memory saving - i know Corona has a proxy tool but read that it doesn't save memory at rendering, what is the best way to manage a thousands of droplets on a bottle in Corona from a rendering/memory point of view?
thanks
T

38

[Max] I need help! / Re: object with alpha, equivalent to Vray's alpha contribution??

« on: 2018-10-02, 18:17:38 »

saw this earlier but its for C4D, I'm a Max head,

I'm pretty sure this is easily done in Corona -
****EDIT update **** - just figured it out- set alpha mode in materials options, even easier than VRay method ;-)

39

[Max] I need help! / [solved] object with alpha, equivalent to Vray's alpha contribution??

« on: 2018-10-02, 17:06:57 »

Hi, I want to render out a studio shot but want background drape to to black in the alpha channel, I can do this easily in Vray, >vray properties of object and set alpha contr. to -1.
how can this be done in Corona please ?

40

[Max] I need help! / Re: Weird pattern - opacity map on simple planes when viewed behind eachother

« on: 2018-05-22, 01:04:15 »

this is where I show my newbieness with Corona (swapped over from VRay)
I am using PT+PT
Increased Render size from 1600*1068 to 3000*2002
Upped Pass Limit from 100 to 300
samples: GI vs. AA balance = 16, light samples multip = 4
does the above look OK?
I think i am coming around to the idea that it is correct due to Moire
thanks,

41

[Max] I need help! / Weird pattern - opacity map on simple planes when viewed behind eachother

« on: 2018-05-21, 23:28:48 »

Hi
My scene is simple planes with texture map and opacity map applied to give effect of a powder coated steel mesh paneling (footbridge over a railway line) looks fine in material editor but when rendered from a view where one  panel is behind the other I am getting a weird pattern - actually it looks like the texture/opacity map only a lot bigger. only happens when viewing one panel behind another. The attached image will illustrate this.
any ideas as to what is causing this?
thanks
Tom

42

[Max] I need help! / Re: New to Corona, vfb and Photoshop difference when opening

« on: 2017-09-25, 16:52:05 »

Thanks, I should have mentioned, I'm using Max2015 and from a previous vray vfb I had changed the OutputGamma=2.2 in the currentdefaults config file, (Input is also 2.2) is there anything within the Corona settings that I should enable/disable?

Not sure if it was a conversion issue but reset max and set to system gamma and now works as it should

43

[Max] I need help! / [solved] New to Corona, vfb and Photoshop difference when opening

« on: 2017-09-25, 15:08:14 »

Hi,
Just tried Corona for first time on a commercial job, rendering out 3D floorplans,
looks great in the Corona VFB with with LUT & tone mapping applied,
what is best way to save out so when opening in PS it looks like it did in VFB, max gamma is 2.2, currently when i open image (png) in PS it is dark and nothing like the Corona VFB

I have saved out as exr (half float) and then added exposure/sat/contrast filters in PS and it is close to the Corona VFB image but not same,
appreciate any help,
thanks,