linear workflow 'reloaded' now online

[Gijs]

question....I work totaly in print and my monitor is calibrated for this so I really dont want to change anything there.

What I have done though is change the gamma in 3DSmax (prefs/gamma 2.2), now when i render the image is much brighter but also washed out. So iv applyed colour correction plug to a few mats (made them 2.2) and now there realy over the top colour wize.

Also, when I save the image and open it in photoshop its very dark.

I realize im missing somthing but what ?(it also doesnt help that I just read the other thread about it and am really confused now)

feeling a bit thick

If your colors look over the top, I want to know what color mapping you used before. If it is exponential, it could well be that you have been correcting your colors to look good in that color mapping mode.

as for the image looking too dark in photoshop, that's because you need to assign the right color profile first. From the AIM-dtp website you can download AIM-RGB G1.0 profile. Assign this to your image. This way your image looks good in Photoshop and you can correct your image in linear space. When you are done, you can either convert a copy to your working space or to a CMYK space for printing etc.

[Gijs]

dont feel think mdi - im having the same issue.
I have found that in photochop cs2 by adjusting the gamma to .5 you get the same result as the max/vray vfb

Don't do this! Assign it a linear profile instead!

[Gijs]

nice work Gijs
What do you recommend using for color mapping if you are using this linear workflow?

nope. this linear workflow would be pretty seriously negated by color mapping. it will transform the data in a way that's not good for linear float image processing.
not good = not accurate.
however...it may look good...if it looks good then it's done

I agree with Rob that in principle you should not use color mapping other than gamma correct to preview. On the other hand you can use color mapping, but only after you make sure that your linear data looks correct.

To give an example (posted in earlier thread as well)
If this is your linear data:


intensity color mapping can help to capture a larger dynamic range (though a bit at the cost of specularity of highlights:

[Gijs]

In order not to confuse, I want to add that in the latter case, you have to see color mapping as a post processing thing. I imagine that if Photoshop would have some sort of color mapping to map a HDRI to a LDRI, it would be better to do this in post.

@Rob, how do you map HDRI linear data to lower dynamic range? Does Nuke have these kind of options?

[throb]

In order not to confuse, I want to add that in the latter case, you have to see color mapping as a post processing thing. I imagine that if Photoshop would have some sort of color mapping to map a HDRI to a LDRI, it would be better to do this in post.

@Rob, how do you map HDRI linear data to lower dynamic range? Does Nuke have these kind of options?

any good compositing tool will have ways to control these types of things.
there are ways to remap your highs and lows and we have a little tool that puts a film curve on the data so that with hdr data the highlights look like they would thru a camera.

[Gijs]

we have a little tool that puts a film curve on the data so that with hdr data the highlights look like they would thru a camera

I'd love to see some examples of that, the linear data (corrected for online viewing) next to the mapped version. Is that little tool available somewhere?

[panthon]

When adapting to use the linear workflow, I´ve noticed worse antialiasing in the bright areas that before was basically correct. Now it´s not, and I would like to know if it´s directly related to the change in the workflow or is a side effect or if it has no relation at all... You can see the difference in antialiasing in the two images posted in this thread too...
I remember that Clamp output had something to do with that, but if u clamp it (and therefore antialiasing returns to the correct way), aren´t u losing data which would be valuable in postproduction?

[rpc212]

so what about post processing in Combustion? Do I change to a Linear workflow in Combustion via a LUT?

[throb]

so what about post processing in Combustion? Do I change to a Linear workflow in Combustion via a LUT?

turn on view lut and put a 2.2 gamma on it

[mdi]

From the AIM-dtp website you can download AIM-RGB G1.0 profile. .

sorry Gijs, could you post a link to that, I did look but i couldnt find it

[Gijs]

When adapting to use the linear workflow, I´ve noticed worse antialiasing in the bright areas that before was basically correct. Now it´s not, and I would like to know if it´s directly related to the change in the workflow or is a side effect or if it has no relation at all... You can see the difference in antialiasing in the two images posted in this thread too...
I remember that Clamp output had something to do with that, but if u clamp it (and therefore antialiasing returns to the correct way), aren´t u losing data which would be valuable in postproduction?

It is not related to linear workflow. Even if you decide to use a clamped output, linear workflow is more physically correct. As you say, clamping means you loose information, namely all values above 100% rgb. The most important is that on image calculation level, things remain linear.

[panthon]

so what about post processing in Combustion? Do I change to a Linear workflow in Combustion via a LUT?

turn on view lut and put a 2.2 gamma on it

When using LUT correction on combustion and, at the same time, ticking the premultiply with color, weird things happen. It looks like it losts all the unclampled values of the image. I´ve premultiplied with white, maybe this could be the problem...I´m going to look into it...

[ipraiseg]

thanks for sharing useful info

[Gijs]

From the AIM-dtp website you can download AIM-RGB G1.0 profile. .

sorry Gijs, could you post a link to that, I did look but i couldnt find it

In the article I link to a page for the native PC profile. When you download this, it also contains the linear profile

[ipraiseg]

intensty mapping is that a sort of linear mapping?
if yes, then is there method control like linear workflow using Photoshop tool.
it would be help if there any article.

thanks

EDIT.
sorry i misunderstood. intensity exponential

i adjusted at flipside' scene from Vlado tutorial.