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Merge branch 'feat-exposure-bands'
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‎README.md

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_this table might not be always up-to-date_
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| tool | description | type | tag |
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|--------------------------------------------------|----------------------------------------------------------------------------|---------------|-------------------------------------------------------------|
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| [nodeToText](src/nodeToText) | Convert the selected nodes knobs:values to a .json. | script | ![i-o](https://img.shields.io/badge/i--o-9a52dd) |
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| [metadataToCamera](src/metadataToCamera) | A custom Nuke node to convert OpenEXR metadata to a Nuke Camera node. | nodes | ![i-o](https://img.shields.io/badge/i--o-9a52dd) |
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| [imageCropDivide](src/imageCropDivide) | From given maximum dimensions, divide an input image into multiples crops. | nodes, script | ![transform](https://img.shields.io/badge/transform-4c78a6) |
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| [primaries_inset](src/primaries_inset) | colorspace remapping to ensure smooth hue reproduction (AgX like) | nodes, blink | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-contrast-linear](src/ocio-contrast-linear) | contrast on linear encoded imagery based on the OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-contrast-log](src/ocio-contrast-log) | contrast on log encoded imagery based on the OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-saturation](src/ocio-saturation) | saturation with variable weights also based on OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [hsv](src/hsv) | color correction with HSV model | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [whitebalance](src/whitebalance) | creative white balance with temperature/tint | nodes, blink | ![grading](https://img.shields.io/badge/grading-43896b) |
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| tool | description | type | tag |
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|--------------------------------------------------|----------------------------------------------------------------------------|----------------|-------------------------------------------------------------|
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| [nodeToText](src/nodeToText) | Convert the selected nodes knobs:values to a .json. | script | ![i-o](https://img.shields.io/badge/i--o-9a52dd) |
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| [metadataToCamera](src/metadataToCamera) | A custom Nuke node to convert OpenEXR metadata to a Nuke Camera node. | nodes | ![i-o](https://img.shields.io/badge/i--o-9a52dd) |
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| [imageCropDivide](src/imageCropDivide) | From given maximum dimensions, divide an input image into multiples crops. | nodes, script | ![transform](https://img.shields.io/badge/transform-4c78a6) |
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| [primaries_inset](src/primaries_inset) | colorspace remapping to ensure smooth hue reproduction (AgX like) | nodes, blink | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-contrast-linear](src/ocio-contrast-linear) | contrast on linear encoded imagery based on the OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-contrast-log](src/ocio-contrast-log) | contrast on log encoded imagery based on the OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [ocio-saturation](src/ocio-saturation) | saturation with variable weights also based on OCIO implementation | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [hsv](src/hsv) | color correction with HSV model | nodes | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [whitebalance](src/whitebalance) | creative white balance with temperature/tint | nodes, blink | ![grading](https://img.shields.io/badge/grading-43896b) |
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| [exposure-bands](src/exposure-bands) | generate successive bands of gradually increasing exposure | nodes | ![generate](https://img.shields.io/badge/generate-3A3B9F) |
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# Utilisation
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‎pyproject.toml

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[tool.poetry]
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name = "foundry-nuke"
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version = "0.6.0"
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version = "0.7.0"
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description = "Collection of script & resources for Foundry's Nuke software."
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authors = ["Liam Collod <monsieurlixm@gmail.com>"]
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readme = "README.md"

‎src/exposure-bands/README.md

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# exposure-bands
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generate successive bands of gradually increasing exposure.
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This is useful when testing and prototyping image-rendering transform and
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you need to evaluate its render against different exposure of a same source.
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![nuke screenshot as example](example.png)
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# design
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Be aware that to be dynamic as possible the node generate the exposure bands
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on different frames. This implies also having tcl expression using the `frame`
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variable which can sometimes lead to unstabilities.
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# adding dynamic text on each band
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It's possible to add text indicating the exposure value of each band without
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manually creating a text node for each band, however it's a bit tricky:
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- Go inside the node
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- Between the 2 internal nodes add a `ModifyMetadata` node
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- add a single `_bands_exposure` key
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- as value of that key put the tcl expression `[value parent._exposure]`
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- Add a `Text` node after the `ModifyMetadata`
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- in the message put the tcl expression `[metadata _bands_exposure]`
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- configure the Text node as you wish
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> Why using a ModifyMetadata node ?
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This is the only hack I found so Nuke properly pickup the band exposure for
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its correct frame (remember the tool use the frame-range to work).
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> [!TIP]
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> If you are using the tool for evaluating image rendering you probably don't
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> want the text to be affected by it, so you will have to put an OCIODisplay
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> node or whatver you use for your image rendering before the text node but after
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> the first internal exposure node.

‎src/exposure-bands/example.png

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‎src/exposure-bands/exposure-bands.nk

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Group {
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name ExposureBandsTest
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xpos 0
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ypos 0
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tile_color 0x64899900
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note_font_color 0xffffff00
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addUserKnob {20 User l ExposureBandsTest}
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addUserKnob {26 txt_exposure l "" +STARTLINE T "<h1> Exposure</h1>"}
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addUserKnob {26 txt_exposure_2 l "" +STARTLINE T "All values in Stops."}
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addUserKnob {26 spacing1 l "" +STARTLINE T " "}
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addUserKnob {3 exposure_start l "start" -STARTLINE}
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exposure_start -6
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addUserKnob {3 exposure_end l " end" -STARTLINE}
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exposure_end 6
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addUserKnob {3 exposure_step l " step" -STARTLINE}
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exposure_step 2
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addUserKnob {26 "" +STARTLINE}
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addUserKnob {3 _frames_number l "bands number"}
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_frames_number {{"(exposure_end - exposure_start) / exposure_step + 1"}}
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addUserKnob {7 _exposure l "current exposure"}
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_exposure {{"frame >= 0 & frame <= _frames_number?exposure_start+exposure_step*frame:0"}}
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addUserKnob {20 About}
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addUserKnob {26 toolName l name T ExposureBandsTest}
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addUserKnob {26 toolVersion l version T 0.1.1}
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addUserKnob {26 toolAuthor l author T "<a style=\"color: rgb(200,200,200);\" href=\"https://mrlixm.github.io/\">Liam Collod</a>"}
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addUserKnob {26 toolDescription l description T "Test image rendering with sucessive bands of gradually increasing exposure."}
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addUserKnob {26 toolUrl l url T "<a style=\"color: rgb(200,200,200);\" href=\"https://github.com/MrLixm/Foundry_Nuke\">https://github.com/MrLixm/Foundry_Nuke</a>"}
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}
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Input {
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inputs 0
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name image
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xpos 0
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ypos 0
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}
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EXPTool {
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name BandExposure
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xpos 0
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ypos 50
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mode Stops
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gang false
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red {{parent._exposure}}
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green {{parent._exposure}}
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blue {{parent._exposure}}
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}
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ContactSheet {
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name BandsContactSheet
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xpos 0
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ypos 200
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width {{width*columns}}
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height {{height}}
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rows 1
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columns {{parent._frames_number}}
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splitinputs true
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startframe 0
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endframe {{parent._frames_number}}
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}
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Output {
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name Output1
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xpos 0
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ypos 350
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}
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end_group

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