Announcement

**vlado** · 07-01-2015, 10:28 AM

Very nice and thanks for sharing! Two notes though:

*) V-Ray squares the burn value before using it
*) The "Corona" and Reinhard mappings are exactly the same formulas eventually, with burn==1/(compression^2) - or compression==(1/b)^0.5 (or in the case of V-Ray itself, burn=1/compression). In the way the script is written, the two modes behave in the same way with respect to highlights.

Best regards,
Vlado

**cheerioboy** · 07-01-2015, 10:47 AM

Originally posted by vlado View Post

Very nice and thanks for sharing! Two notes though:

*) V-Ray squares the burn value before using it
*) The "Corona" and Reinhard mappings are exactly the same formulas eventually, with burn==1/(compression^2) - or compression==(1/b)^0.5 (or in the case of V-Ray itself, burn=1/compression). In the way the script is written, the two modes behave in the same way with respect to highlights.

Best regards,
Vlado

Is it possible to tweak the code to have the Corona option to be more in line with V-Ray's method of Reinhard mapping? What would the expression have to change to?

thanks

**vlado** · 07-01-2015, 10:59 AM

The exact expression that V-Ray uses is this:

Code:

red  =r*(1+r*(burn**2))/(1+r)
green=g*(1+g*(burn**2))/(1+g)
blue =b*(1+b*(burn**2))/(1+b)

As you can see, the only difference is that the burn is multiplied instead of divided by.

Best regards,
Vlado

**cheerioboy** · 07-01-2015, 11:24 AM

I attempted to update the gizmo to have a V-Ray option instead of Corona. You said the Reinhard and Corona options performed a similar tone mapping, so I just adjusted the tool tips to mention that the Reinhard option is similar to Corona, and now Vray has it's own option in the drop down. And it looks like it matches exactly in my tests between an image mapped within Vray vs Nuke.

Thanks Vlado!

Code:

version 9.0 v1
push $cut_paste_input
Group {
 name Tonemap
 selected true
 xpos -21
 ypos -156
 addUserKnob {20 tonemap l Tonemap t "Adjusts blend between linear colors and full tonemap"}
 addUserKnob {41 operator l Operator t "Available operators:\nReinhard (Corona; desaturates highlights)\nExponential luma (modo, Maxwell; saturates highlights)\nFilmic (punchier look, darker shadows; more control over look)\nVray (similar to Reinhard)" T Switch1.operator}
 addUserKnob {41 mix l "Tonemap Mix" t "Blends between input and tonemapped image" T Merge1.mix}
 addUserKnob {20 exposure l "Exposure Adjustment" n 1}
 exposure 0
 addUserKnob {41 mode l "Adjust in" T EXPTool1.mode}
 addUserKnob {41 gang T EXPTool1.gang}
 addUserKnob {41 red T EXPTool1.red}
 addUserKnob {41 green T EXPTool1.green}
 addUserKnob {41 blue T EXPTool1.blue}
 addUserKnob {20 endGroup n -1}
 addUserKnob {20 exponentialStrength l "Reinhard and Exponential Luma Controls" n 1}
 exponentialStrength 0
 addUserKnob {41 mix_1 l Burn T Reinhard_Merge.mix}
 addUserKnob {20 endGroup_3 l endGroup n -1}
 addUserKnob {20 filmic_1 l "Filmic Controls" n 1}
 filmic_1 0
 addUserKnob {19 Grade1_black l lift t "Lifts blacks" R 0 0.1}
 Grade1_black 0.005
 addUserKnob {6 Grade1_black_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
 addUserKnob {41 shoulderStr l "Shoulder Str." t "Higher values produces brighter highlights" T Expression_Filmic.shoulderStr}
 addUserKnob {41 linStr l "Linear Str." T Expression_Filmic.linStr}
 addUserKnob {41 linAngle l "Linear Angle" T Expression_Filmic.linAngle}
 addUserKnob {41 toeStr l "Toe Str." T Expression_Filmic.toeStr}
 addUserKnob {41 toeNum l "Toe Num." T Expression_Filmic.toeNum}
 addUserKnob {41 toeDen l "Toe Denom." T Expression_Filmic.toeDen}
 addUserKnob {41 whitepoint l INVISIBLE +INVISIBLE T Expression_Filmic.whitepoint}
 addUserKnob {20 endGroup_1 l endGroup n -1}
 addUserKnob {20 Vray l "Vray Controls" n 1}
 Vray 0
 addUserKnob {41 burn l Burn T Expression_Vray.burn}
 addUserKnob {20 endGroup_2 l endGroup n -1}
}
 BackdropNode {
  inputs 0
  name Film_Simulation
  label "NOT IMPLEMENTED"
  xpos -663
  ypos -224
  bdwidth 141
  bdheight 196
 }
 BackdropNode {
  inputs 0
  name Filmic
  xpos -340
  ypos -221
  bdwidth 144
  bdheight 193
 }
 BackdropNode {
  inputs 0
  name Luma_modo
  xpos -171
  ypos -212
  bdwidth 274
  bdheight 190
 }
 BackdropNode {
  inputs 0
  name Notes
  label "Filmic tonemap operator is based\non John Hable's work for Unchartered 2:\nhttp://filmicgames.com/archives/75\n\nExponential luma operator is used by \nmodo and Maxwell.\n\nReinhard operator is Reinhard global.\n\nCorona is from the 3ds Max plugin render\nengine Corona.\n\n\nCopyright 2013 Simon Lundberg\nFeel free to re-use, adapt, distribute\nand change tool to suit your needs,\nbut please don't sell it."
  note_font_size 25
  xpos 582
  ypos -307
  bdwidth 616
  bdheight 512
 }
 BackdropNode {
  inputs 0
  name Reinhard
  xpos 116
  ypos -215
  bdwidth 243
  bdheight 191
 }
 BackdropNode {
  inputs 0
  name VRay
  xpos -498
  ypos -222
  bdwidth 151
  bdheight 194
 }
 Input {
  inputs 0
  name mask
  xpos -462
  ypos -344
  number 1
 }
 Dot {
  name Dot11
  xpos 499
  ypos -341
 }
 Dot {
  name Dot10
  xpos 499
  ypos 218
 }
 Input {
  inputs 0
  name img
  xpos -581
  ypos -344
 }
 Dot {
  name Dot14
  xpos -547
  ypos -295
 }
set N4f338800 [stack 0]
 EXPTool {
  mode Stops
  name EXPTool1
  xpos -462
  ypos -298
 }
 Dot {
  name Dot19
  xpos -216
  ypos -295
 }
 Dot {
  name Dot33
  xpos -216
  ypos -241
 }
set N4f339c00 [stack 0]
 Dot {
  name Dot24
  xpos -275
  ypos -241
 }
set N4f35bc00 [stack 0]
 Dot {
  name Dot25
  xpos -431
  ypos -241
 }
set N4f35b800 [stack 0]
 Dot {
  name Dot28
  xpos -612
  ypos -241
 }
 Dot {
  name Dot29
  xpos -612
  ypos -185
 }
 Dot {
  name Dot30
  xpos -612
  ypos -62
 }
 Dot {
  name Dot31
  xpos -612
  ypos 80
 }
 Dot {
  name Dot32
  xpos 19
  ypos 80
 }
push $N4f35b800
 Expression {
  expr0 r*(1+r*(burn**2))/(1+r)
  expr1 g*(1+g*(burn**2))/(1+g)
  expr2 b*(1+b*(burn**2))/(1+b)
  name Expression_Vray
  selected true
  xpos -465
  ypos -147
  addUserKnob {20 User}
  addUserKnob {7 burn l Burn}
  burn 0.25
 }
set N4f35a000 [stack 0]
 Dot {
  name Dot26
  xpos -431
  ypos -47
 }
 Dot {
  name Dot5
  xpos -431
  ypos 59
 }
 Dot {
  name Dot17
  xpos 29
  ypos 59
 }
push $N4f35bc00
 EXPTool {
  mode Stops
  red 1.8
  green 1.8
  blue 1.8
  name EXPTool2
  xpos -306
  ypos -173
 }
 Grade {
  black {{parent.Grade1_black.r} {parent.Grade1_black.g} {parent.Grade1_black.b} {parent.Grade1_black.a}}
  name Grade1
  xpos -306
  ypos -138
  addUserKnob {20 User}
 }
 Expression {
  temp_name0 tNtD
  temp_expr0 toeNum/toeDen
  temp_name1 tStD
  temp_expr1 toeStr*toeDen
  temp_name2 tStN
  temp_expr2 toeStr*toeNum
  temp_name3 lAlS
  temp_expr3 linAngle*linStr
  expr0 ((r*(shoulderStr*r+lAlS)+tStN)/(r*(shoulderStr*r+linStr)+tStD))-tNtD
  expr1 ((g*(shoulderStr*g+lAlS)+tStN)/(g*(shoulderStr*g+linStr)+tStD))-tNtD
  expr2 ((b*(shoulderStr*b+lAlS)+tStN)/(b*(shoulderStr*b+linStr)+tStD))-tNtD
  name Expression_Filmic
  xpos -306
  ypos -95
  addUserKnob {20 User}
  addUserKnob {7 shoulderStr l "Shoulder Str."}
  shoulderStr 0.5
  addUserKnob {7 linStr l "Linear Str."}
  linStr 0.8
  addUserKnob {7 linAngle l "Linear Angle"}
  linAngle 0.2
  addUserKnob {7 toeStr l "Toe Str."}
  toeStr 0.9
  addUserKnob {7 toeNum l "Toe Num." R 0 0.1}
  toeNum 0.065
  addUserKnob {7 toeDen l "Toe Denum."}
  toeDen 0.9
  addUserKnob {7 whitepoint l "White point" R 0 50}
  addUserKnob {7 whitepointExp}
  whitepointExp {{((whitepoint*(shoulderStr*whitepoint+linAngle*linStr)+toeStr*toeNum)/(whitepoint*(shoulderStr*whitepoint+linStr)+toeStr*toeDen))-(toeNum/toeDen)}}
 }
 Dot {
  name Dot22
  xpos -275
  ypos -52
 }
 Dot {
  name Dot15
  xpos -275
  ypos 42
 }
 Dot {
  name Dot9
  xpos 47
  ypos 42
 }
push $N4f339c00
 Dot {
  name Dot21
  xpos -151
  ypos -241
 }
set N502b3000 [stack 0]
 Dot {
  name Dot2
  xpos -151
  ypos -176
 }
set N502b2c00 [stack 0]
 Dot {
  name Dot3
  xpos -151
  ypos -134
 }
set N502b2800 [stack 0]
 Dot {
  name Dot20
  xpos -151
  ypos -105
 }
push $N502b2800
push $N502b2c00
 Saturation {
  saturation 0
  name Saturation1
  xpos -103
  ypos -179
 }
 Add {
  value 1
  name modo_add
  xpos -4
  ypos -185
 }
 Merge2 {
  inputs 2
  operation divide
  Bchannels rgb
  name modo_Divide
  xpos -4
  ypos -137
 }
 Merge2 {
  inputs 2
  operation copy
  mix 0.25
  name Reinhard_Merge
  xpos -4
  ypos -108
 }
 set C502d3400 [stack 0]
 Dot {
  name Dot8
  xpos 69
  ypos -53
 }
 Dot {
  name Dot4
  xpos 69
  ypos 34
 }
push $N502b3000
 Dot {
  name Dot1
  xpos 122
  ypos -241
 }
 Dot {
  name Dot12
  xpos 122
  ypos -174
 }
set N502d2400 [stack 0]
 Dot {
  name Dot13
  xpos 122
  ypos -128
 }
set N502d2000 [stack 0]
 Dot {
  name Dot18
  xpos 122
  ypos -85
 }
push $N502d2000
push $N502d2400
 Add {
  value 1
  name Reinhard_Add
  xpos 222
  ypos -183
 }
 Merge2 {
  inputs 2
  operation divide
  Bchannels rgb
  name Reinhard_Divide
  xpos 222
  ypos -131
 }
clone $C502d3400 {
  inputs 2
  xpos 222
  ypos -88
  selected false
 }
 Dot {
  name Dot23
  xpos 256
  ypos -47
 }
 Dot {
  name Dot16
  xpos 256
  ypos 42
 }
 Dot {
  name Dot7
  xpos 90
  ypos 42
 }
 Switch {
  inputs 5
  which {{operator}}
  name Switch1
  xpos 38
  ypos 112
  addUserKnob {20 User}
  addUserKnob {4 operator l Operator M {Reinhard "Exponential luma" Filmic V-Ray ""}}
  operator V-Ray
 }
 Clamp {
  maximum_enable false
  name Clamp1
  xpos 38
  ypos 153
 }
push $N4f338800
 Dot {
  name Dot27
  xpos -777
  ypos -295
 }
 Dot {
  name Dot6
  xpos -777
  ypos 218
 }
 Merge2 {
  inputs 2+1
  operation copy
  name Merge1
  xpos 38
  ypos 215
 }
 Output {
  name Output1
  xpos 38
  ypos 386
 }
push $N4f35a000
 Viewer {
  frame_range 1-100
  name Viewer1
  xpos -1002
  ypos 29
 }
end_group

**vlado** · 07-01-2015, 11:32 AM

Looks good. In fact, the "Corona" formula is exactly the one described by Reinhard in his original paper "Photographic Tone Reproduction for Digital Images". For V-Ray, I modified it a bit as it seemed easier to work with values from 0 to 1 rather than from 0 to infinity.

Best regards,
Vlado

**Crush** · 08-01-2015, 02:56 AM

Vlado, could you please clarify: Is there any downside to applying burn via VFB or comp compared to setting it up in the VRay render settings? Or is it basically the same? I'm thinking about sampling/AA issues...

**vlado** · 08-01-2015, 03:14 AM

Originally posted by Crush View Post

Vlado, could you please clarify: Is there any downside to applying burn via VFB or comp compared to setting it up in the VRay render settings? Or is it basically the same? I'm thinking about sampling/AA issues...

If you set it in the renderer, it will affect the sampling, yes. This can be very useful when sampling images with bright areas like car headlights, lots of glass that reflects light sources etc. However, you can always set the color mapping mode to "Don't apply anything" - then the burn will only be used for sampling, but the final output will still be linear. Then you can play with the final burn value in the VFB or in post.

Best regards,
Vlado

**Morne** · 22-10-2015, 11:41 AM

Originally posted by vlado View Post

If you set it in the renderer, it will affect the sampling, yes. This can be very useful when sampling images with bright areas like car headlights, lots of glass that reflects light sources etc. However, you can always set the color mapping mode to "Don't apply anything" - then the burn will only be used for sampling, but the final output will still be linear. Then you can play with the final burn value in the VFB or in post.

Best regards,
Vlado

In the case of "Don't apply anything", will that one render longer with bright values than if I set it to "color mapping only, (no gamma)"?

However the longer render times can still be good, because you will have more range in post?

**Oleg_Budeanu** · 06-12-2016, 01:34 AM

Originally posted by Morne View Post

In the case of "Don't apply anything", will that one render longer with bright values than if I set it to "color mapping only, (no gamma)"?

However the longer render times can still be good, because you will have more range in post?

I don't think so, as it affects only final image - sampler is not affected as i understand.

Announcement

tone mapping in Nuke

tone mapping in Nuke

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