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CinePrint16 User Guide

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CinePrint 16
User Guide
Created by Tom Bolles
tombolles.net
Introduction
CinePrint 16 is a PowerGrade for Davinci Resolve that mimics the aesthetic qualities of analog
film.
The PowerGrade format makes CinePrint 16 a versatile, customizable, and camera agnostic
tool for cinematic look creation.
It is important to note that CinePrint 16 is not a technical transform or a one-to-one recreation
of any existing film stock. Rather, it is a look creation tool that was developed to taste with the
goal of being both filmic and customizable so that users have the ability to create their own
unique film emulations.
In summary, the CinePrint 16 node tree is a great resource for colorists looking to design and
explore custom celluloid film looks.
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Installation
The download is a compressed .zip file containing the User Guide .pdf, the .drx PowerGrade,
and the .dpx thumbnail.
1.
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Open the .zip file
Move the files to wherever you want them stored.
Open Davinci Resolve and go to the Color page
In the Gallery tab select the sidebar icon below to show the Still Albums sidebar.
Select the PowerGrade 1 stills album.
Right click in the gallery window background and select Import.
Navigate to where you stored the .dpx and .drx files and import them.
a.
If the files are greyed out, click the options button at the bottom of the import
window, select .dpx or .drx from the list, and try again.
Once imported, the PowerGrade can be applied to the selected shot by middle mouse
button clicking on the thumbnail, or right click -> Apply Grade.
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Node Tree Overview
The CinePrint 16 node tree can be conceptually divided into three sections:
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The top section is for footage preparation and correction. Spatial adjustments (denoise,
grain, halation, dust) are done here.
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The middle section is empty space allocated for the user to do most of their creative
grading, such as primary and secondary adjustments.
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The bottom section is where the footage is finally brought into a celluloid film look.
Color adjustments (hue, saturation, tonal response) are done here.
The order of operations within the pipeline is certainly important, as it has an effect on the final
look. While this guide contains suggestions for working with this pipeline, it is useful to
remember that there are no hard rules. Ultimately, you can do whatever you want with the
powergrade and the only thing that matters is that you’re happy with the final look!
Customization:
Visual characteristics are organized into compound nodes and can be enabled and disabled
with Command + D (Mac) or Control + D (Windows). The contents inside the compound node
can be accessed with Right-Click -> Show Compound Node.
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Node info
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Denoise
Denoising is applied first so that all downstream adjustments are working with clean footage.
Different cameras have different noise patterns, so settings may differ and denoising should
ultimately be set by eye.
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Spatial Threshold
Unlink Luma and Chroma
Leave Luma at 0
Set Chroma in the 8-12 range. Be aware that very high values begin to
overcompensate and can create chroma artifacting when Mode is set to Faster
Spatial chroma denoising is enough for most footage. However, for some low light scenes you
may need temporal noise reduction:
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Temporal NR
Set to 5 frames so the denoising has the most temporal data to work with.
Temporal Threshold
Unlink Luma and Chroma
Leave Luma at 0 unless Luma denoising is deemed necessary
Set Chroma in the 8 - 12 range.
NOTE: Denoising (especially temporal denoising) is the most processing intensive node in the
node tree. If you need smoother playback, temporarily setting temporal NR back to 0, or
disabling the entire denoise node will help.
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Res+Grain
The resolution of the footage is adjusted using a Gaussian blur, then grain is added.
Adding grain directly to the log footage accurately mimics a log film scan and allows the grain
to be affected by all further adjustments in the pipeline (Color, contrast, halation, etc). Grain
being dynamically affected by downstream adjustments makes it feel more realistic and
embedded as opposed to overlayed.
Blur and grain should be adjusted depending on both the footage resolution and the desired
output format look (e.g. 8mm, 16mm, 35mm, 70mm).
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Gaussian Blur
Blur value usually somewhere between 0.100 and 0.200
Border type set to replicate to avoid black borders
Grain
Composite type: Overlay
Opacity: 0.600
Increase or decrease depending on how grainy of a look you want
Texture: 0.704
This can be adjusted slightly, but be aware that much higher and lower
numbers tend to create noticeable patterns.
Grain Size: 0, unless you’re going for a small format look like 8mm.
Grain Aspect Ratio: 1
Grain Strength: 0.3
Behaves similar to opacity, so can be used in addition to opacity
Offset: 0.482
Symmetry: 0.5
Softness: 0.234
Saturation: 0.2
Gives grain some slight color variance. In color film, grain is not
monochromatic. It is present in all three dyed layers.
Tip: To further customize grain color response, apply it individually to each color channel. Split
the image into the RGB channels by adding a splitter node (Option + Y). Copy and paste the
original grain node to each channel node, then delete the original grain node. Change grain
saturation in each channel to change the mix of colors in the grain. Be aware that this
technique will significantly affect playback speed and render time.
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Cam Prep
The footage is transformed from its original gamma and color space to Arri LogC and Alexa
Wide Gamut. An alternative transform that compresses exposure levels in linear space before
converting to LogC is also available for custom lower contrast looks.
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Main CST (top option)
Set the appropriate input color space and gamma for your footage.
Output Color Space and Gamma should be ARRI
Tone Mapping Method: Luminance Mapping
Custom max input and output disabled
Adaptation: 9
Gamut Mapping Method: Saturation Mapping
Saturation Knee: 0.9 (decrease to 0.5 if experiencing out of gamut
artifacts in high saturation or neon looking areas.
Saturation Max: 1.0
Note: If working with RAW footage, specular highlights may be clipping even after tone
mapping, in which case you can bring them down with the highlight slider in the RAW tab.
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Cam Prep (cont.)
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HDR composite CST (bottom option)
This branch of the node tree converts the footage to linear space, and then splits
it into a darkened image and a highlight key. The highlight key contains only
specular highlights. The darkened image has the gain brought way down and the
gamma lifted. The exposures are then combined with a Layer Mixer node set to
Add, then the image is converted from linear space to Arri LogC.
To use this node:
Connect the To LogC node to the G Lim node, overriding the connection
of the main CST.
In the To Linear node, set the appropriate input gamma and gamut for
your footage
In the Low+Mid node, adjust the balance of Gain and Gamma until your
desired exposure is achieved.
G Lim (Gamut Limiter)
- If you’re creating a look where halation is disabled, but are encountering
out-of-gamut artifacts in high saturation and neon colors, enabling this gamut
limiting node may help.
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Halation
Halation is added in linear space so it accurately responds according to the original light levels
of the scene. It is implemented as the bottom input in a Layer Mixer node set to Add. There
are two premade options, a High Pass Key, where the curve only affects highlights, and a
Gradual Key where the curve is across the whole range of the image. After the halation is
added to the base image (the top node), the output is converted back to LogC, and then
gamut limited to to avoid out-of-gamut artifacts from channel clipping.
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High Pass and Gradual Key nodes
Adjust halation color and threshold using the RGB curves.
The white luma curve affects the saturation of the halation. The RGB
curves affect hue.
Adjust halation size under the Blur tab.
Make sure the chain icon is enabled so the RGB channels are ganged
together. Keeping the channels ganged and only doing color with the
curves avoids color artifacts in the halation and allows for more nuanced
colors.
Adjust opacity by changing Gain in the Keying tab.
Note: If your footage aspect ratio is different from your timeline aspect ratio, halation will bleed
over onto the black bars. For those recreating film gates with mattes, this may be a desirable
effect, but for those looking for a cleaner look, you can avoid this by drawing a rectangular
mask around your footage.
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NS Matrix
The neon suppression matrix is an optional matrix adjustment that can help fix out-of-gamut
issues in highly saturated colors. This is typically used to remap the extra wide gamuts of
some cameras, but it can also be used as a creative look adjustment. It pulls back saturated
greens and shifts skin tones away from yellow to slightly more red.
Neon Suppression is an ACES LMT (Look Modification Transform). Resolve displays the LUT
icon on the node, but the referenced file is a actually a .xml not a .cube. The .xml script
performs a matrix adjustment to ACES AP0 primaries, so it does not clip or clamp data in any
way despite the LUT icon.
The NS matrix works well in combination with the Vintage node (page 18), as it brings out
more earthy tones.
Dust
The dust node adds dust to the image using Resolve’s Film Damage OFX. The included
customized settings keep the dust minimal and realistic, but can be adjusted to taste.
The dust algorithm tends to generate slightly more dust around the borders which can feel
unbalanced, so a rectangular mask is added so dust is not applied to the edges of the frame.
This mask needs to be readjusted depending on the aspect ratio of your footage.
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Add Dirt
Changing Dirt: enabled
Dirt Density: 1.000
Dirt Blur: 0.245
Dirt Seed: 5
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Lab adj
The Lab adjustment node is a compound node containing two matrix adjustments in CIELAB
color space.
Lab is a very useful color space as it isolates luminance to its own channel, allowing color
contrast to be manipulated without affecting luminance.
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The L channel contains luminance
The A channel contains the Blue vs Yellow Axis
The B channel contains the Green vs Red Axis.
Matrix adjustments are implemented using Resolve’s RGB Mixer. When set to Lab color, the
Red, Green, and Blue channels of the RGB Mixer behave as the Luminance, A, and B
channels of Lab.
LABmixH
Reduces CIELAB saturation on the Blue VS Yellow axis. It is useful for correcting and
desaturating excessive blue tones, even after white balance, especially in the shadows. It can
also be used to help create less busy, more complimentary color palettes.
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RGB Mixer, node set to Lab (CIE) color space
Blue Output
G value: 0.34
B value: 0.66
For a reasonably balanced image, these two values should add to
approximately 1
Setting the G value to 1 and the B value to 0 results in a two-tone image.
LABmixL
Adjusts the CIELAB luminance channel in response to changes in the a and b channels.
Luminance is affected without significantly affecting hue angle or saturation.
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RGB Mixer, node set to Lab (CIE) color space
Red Output
G value: -0.39
B value: 0.39
For a reasonably balanced image, these two values should add to
approximately 0
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Saturation, White Balance, Exposure
SatPrep
Saturation is increased to an appropriate level before grading.
WB
White balance using the offset wheel is done here.
Expo
Exposure adjustments are made here. Lift, Gamma, Gain, Offset, Contrast.
Sat
Saturation adjustments are made here.
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Grading Space
This empty space is for the user to add nodes. Most primary (wheels/curves) and secondary
(qualifiers/masks) creative grading occurs at this point in the node tree.
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Lab Sat
The Lab saturation node is a compound node that performs channel-specific color separation
and saturation in CIELAB color space.
First a gamut limiter helps prevent out-of-gamut artifacts. The footage is then split into L, A,
and B channels. Contrast is increased on the A channel to increase Green vs Red separation,
and on the B channel to increase Blue vs Yellow separation. Adjusting pivot changes the
balance of colors and works well for emphasizing complementary palettes. The channels are
then combined and converted back to Arri LogC.
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A channel (G-R) node
Contrast: 1.200
Pivot: 0.5
B channel (B-Y) node
Contrast: 1.200
Pivot: 0.5
Adjust contrast to change the amount of color separation on that color axis.
Adjust pivot to change the point of color separation on that color axis
Note: Adjusting pivot in the Lab Sat node while under a print film output LUT is a great way to
quickly achieve dramatic “warm vs cool” or “teal and orange” looks, and it does so in a very
pleasing way.
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Den+Sub
The Density + Subtractive node is a compound node that implements film-like density,
saturation, and color using RGB matrix adjustments and curves. The option to emulate
subtractive color mixing is also available here.
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Crv1+SUB compound node
SAT curves
Lowers saturation in highlights
Compresses saturation range by desaturating high saturation colors
SUB
Emulates subtractive color mixing. Highly saturated colors become lower
in luminance, giving them a deeper, richer appearance.
Intensity can be adjusted with Key Output Gain in the Node Key panel.
Sub HSL node is set to HSL color space. In HSL color space, the Red,
Green, and Blue channels of the RGB Mixer behave as the Hue,
Saturation, and Luminance channels.
In the RGB Mixer:
Preserve Luminance disabled
Blue Output
G Value: -0.65
This lowers luminance in relation to saturation
Gain node: Gain set to 1.05 to compensate for slight decrease in overall
image luminance. Disable this node if you want lower luminance.
RGB tone
Contrast, roll-off, and tints added with RGB curves
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Den+Sub (cont.)
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RGB mix
The RGB Mixer is used to enhance saturation in a more nuanced way, bringing
out richer greens and more color variance in skin tones.
Crv2 compound node
Contains Hue vs Hue and Hue vs Sat adjustments
Skin
Qualifier for correcting skin tones
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Vintage
The Vintage compound node imitates 1960’s era film stock through secondary adjustments to
the greens, and RGB matrix adjustments to the red and green channels.
Enabling the neon suppression and subtractive color nodes can further add to the look.
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GreenSat
Qualifies green hues and desaturates them
Matrix RG
RGB Mixer
Preserve Luminance disabled
Red Output:
G Value: -0.44
B Value: 0.47
Magenta and blue are added to colors that use the Red channel
(red, yellow, magenta)
Green Output:
R Value: -0.08
G Value: 1.06
Cyan and green are added to colors that use the Green channel
(yellow, green, cyan)
Offset
Slight correction to remove magenta cast from image
Desat
Overall saturation is decreased
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Highlights
The Highlights compound node adds a shoulder to the tone curve for more nuanced highlight
roll-off and adds a green tint to highlights.
The alternate node branch on the bottom does not have a roll-off shoulder, but works well for
emulating certain film scan looks with harsher highlights.
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Cineon
The Cineon node is one of two output options, the other being the PrintFilm node.
Using a Color Space Transform, the footage is converted from Cineon log to Rec. 709. The
final look mimics a direct scan of negative film, no print film involved, just an inverted negative.
Various adjustments are available after the cineon log conversion:
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Black Lvl
Lowers the black point of the luma curve
Warmer
Lowers blue and green curve endpoints for a warmer white point
PostSat
For adjusting final Rec. 709 image saturation
PostCon
For adjusting final Rec. 709 image contrast
LabCon
Adjusting contrast in CIELAB color space also affects saturation and
temperature in pleasing ways.
PostGain
For adjusting the white point level
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PrintFilm
The PrintFilm node is an output option that converts to Rec. 709 using print film emulation
LUTs. These recreate the color and density response of positive print film. The node tree
contains the Kodak 2383 and Fujifilm 3513 LUTs at different white points.
Additional adjustments include:
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Black Lvl
Lowers the black point of the luma curve
Warmer
Lowers blue and green curve endpoints for a warmer white point
PostSat
For adjusting final Rec. 709 image saturation
LabCon
Adjusting contrast in CIELAB color space also affects saturation and
temperature in pleasing ways.
Ceiling and Ceiling 2
Disabling both nodes results in the slightly lower highlight ceiling of the 2383
LUT. Enabling them allows for a higher white point.
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Sharp
Subtle post sharpening is added to enhance grain. Radius is lowered to 0.47 in the blur tab
Gate W
Gate weave is implemented using Resolve’s Camera Shake OFX. The scale is set to a
miniscule value so that the image has the slightest shudder on the pixel level, mimicking the
movement of the negative through the film gate.
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Motion Scale: 0.020
Speed Scale: 2.000
Motion Blur: 0.000
Shake Levels
Pan Amplitude: 0.050
Tilt Amplitude: 0.200
Rotation Amplitude: 0.100
PTR Speed: 2.000
Zoom Amplitude: 0.000
Zoom Speed:0.000
Blanking Handling
Zoom to Crop: 0.050
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General Workflow
After applying the PowerGrade:
1.
Set correct input gamma and gamut
2.
Set white balance
3.
Set exposure
4.
Adjust resolution + grain
5.
Select Output Look (Cineon or print film)
6.
Adjust halation
7.
Customize & grade!
Working with Groups
When using CinePrint 16 with Resolve’s Group functionality, the PowerGrade should be
applied as follows:
1.
Apply the grade to the Group Pre-Clip window. Then delete the bottom section of the
grade, leaving only the top section.
2.
Next, apply the grade to the Group Post-Clip window. Then delete the top section of the
grade, leaving only the bottom section.
3.
Now, any grading adjustments intended for the entire Group can be made at the end of
the Pre-Clip node tree, and adjustments intended for a single clip can be made in the
Clip window.
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Working with Groups (cont.)
Group Pre-Clip
Group Post-Clip
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Additional Tips and Tricks
White Balance and Exposure
If your end look is going through the Cineon node, it’s a good idea to check what your grade
looks like in the Kodak 2383 print film node. 2383 has more exaggerated color and luma
contrast, so “mistakes” in your exposure and white balance will be more apparent under 2383.
White balancing under 2383 and then going back to Cineon is a useful technique. The image
will tend to have a slight green cast, which is accurate to how an uncorrected negative film
scan would look without print film. If the slight green is not desired then white balance can be
further adjusted.
Diffusion
The same technique used in the Halation node can be used to mimic diffusion filters. As
opposed to a red tinted blur, gang the curves together so that all channels receive blur equally.
Adjust blur size in the Blur tab, and adjust opacity with the gain control in the Node Key tab.
Dust
Negative film scan dust is white because the negative is inverted, so dust blocking light in the
scanner and creating dark pixels becomes white after inversion. In addition, you can have dust
on the positive print, which would block light during projection and appear dark. To emulate
this simply duplicate the Dust node and in the new node change the dust color to a dark grey.
Make sure to change the seed value as well so the dark dust is not the same pattern applied
directly on the bright dust.
Push and Pull Processing
Adjusting the balancing of pre and post contrast can achieve a similar effect to push and pull
film processing. Increasing contrast in the main exposure node, and then decreasing it in the
output PostCon node mimics the results of push processing, and the opposite mimics pull
processing.
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Video Overview
Link: https://www.youtube.com/watch?v=4BufREoC8xE
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Happy Grading!
Tom Bolles
tombolles.net
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