CIE Scope

kdenlive-show-video CIE Scope

Status :

Maintained

Keyframes :

Source library :

avfilter

Source filter :

ciescope

Available :

linux appimage windows apple

On Master only :

Known bugs :

Color depth :

10bit color-management

Tutorial :

Description

This effect/filter displays a CIE color diagram with overlaid input pixels.

Tip The effect uses the pixel format of the clip it is applied on in compositing. By default, CIE Scope just displays the scope, so if you want to overlay it on the clip itself, you need to put the clip in the track below. If that clip does not have an alpha channel, the scope will not overlay but obscure the clip below. You can add an Alpha Shapes effect to the clip, set the operations mode to Min, and adjust the size of the rectangle to the scope dimensions and thus get the CIE Scope to overlay the clip.

Parameters

Parameter	Value	Description
Color System	Selection	Set color system to use
CIE System	Selection	Set CIE system to use
Gamuts to Draw	Selection	Set what gamuts to draw
Size	Integer	Set CIE Scope size, by default set to 512.
Intensity	Float	Set intensity used to map input pixel values to CIE diagram
Contrast	Float	Set contrast used to draw tongue colors that are out of active color system gamut
Display Correct Gamma	Switch	Correct gamma displayed on scope, by default enabled
Show White Point	Switch	Show white point on CIE diagram, by default disabled
Input Gamma	Float	Set input gamma. Used only with xyY input color space.
Fill with CIE Colors	Switch	Fill with CIE colors, by default enabled.

The following selection items are available:

Color System[[1]], Gamuts to Draw

NTSC	American standard for color TV. For the color space relevance, refer to this page in Wikipedia.
BT.470M	Same as NTSC
EBU	Color space used by the European Broadcasting Union (basically BT.601)
BT.470BG
SMPTE	Color space used by the Society of Motion Picture and Television Engineers (SMPTE)
BT.240M

Wide RGB | Wide Gamut RGB[[2]] as defined by Adobe

HD TV | Using the YCbCr color model (Rec. 709)
Rec. 709 | Same as HD TV
UHD TV | Using the YCbCr color model (Rec. 2020)
Rec. 2020 | Same as UHD TV

xyY	Using the CIE xyY[[5]] color space (derived from CIE XYZ).
UCS	CIE 1960 UCS[[6]] color space
LUV	CIELUV[[7]] (abbreviation for CIE 1976 L, u, v)

Examples

This shows the CIE Scope effect with the default settings. Depending on your source material the pixel distribution will look differently.

This shows the CIE Scope effect with the following settings:

Color System: CIE 1931

CIE System: UCS

Gamuts to Draw: SMPTE

This shows the CIE Scope effect with the following settings:

Color System: BT.470M

CIE System: LUV

Gamuts to Draw: Apple

[1] ([1],[2],[3])

For more information about the color space models, refer to the RGB Color Space Models page on Wikipedia

[[2]]

https://en.wikipedia.org/wiki/Wide-gamut_RGB_color_space

[[3]]

https://en.wikipedia.org/wiki/CIE_1931_color_space

[[4]]

https://en.wikipedia.org/wiki/DCI-P3

[[5]]

https://en.wikipedia.org/wiki/CIE_1931_color_space#CIE_xyY_color_space

[[6]]

https://en.wikipedia.org/wiki/CIE_1960_color_space

[[7]]

https://en.wikipedia.org/wiki/CIELUV *[RGB]: Red, Green, Blue *[VFX]: Visual Effects *[feathering]: Smoothing or blurring the edges of a feature *[LFO]: Low-Frequency Oscillation *[dB]: decibel *[LUFS]: Loudness Units Full Scale *[AI]: Artificial Intelligence *[LLM]: Large Language Model *[HSV]: Hue, Saturation, Value *[SOP/Sat]: S(lope), O(ffset), P(ower) / SATuration *[CDL]: Color Decision List *[HSL]: Hue, Saturation, Lightness - Using HSL color space is useful for subtle color changes *[px]: pixel *[hh:mm:ss:ff]: hours:minutes:seconds:frames *[Hz]: Hertz *[CIE]: Commission internationale de l'éclairage, French for International Commission on Illumination *[DCI]: Digital Cinema Initiative