LCARdS

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Base SVG Filters Reference ​

Visual filters for base SVG layer Apply opacity, blur, brightness, and other effects to make overlays more prominent

Overview ​

Apply visual filters to the base SVG layer to make overlays more prominent while keeping overlays crisp and clear.

Quick Start ​

Apply a preset:

yaml
base_svg:
  source: builtin:ncc-1701-a-blue
  filter_preset: dimmed

Custom filters:

yaml
base_svg:
  source: builtin:ncc-1701-a-blue
  filters:
    opacity: 0.5
    blur: "3px"

Combine preset with overrides:

yaml
base_svg:
  source: builtin:ncc-1701-a-blue
  filter_preset: dimmed
  filters:
    opacity: 0.3  # Override preset's 0.5

Filter Types ​

Opacity ​

Controls transparency of base SVG (0.0 = invisible, 1.0 = fully opaque).

yaml
filters:
  opacity: 0.5  # 50% transparent

Use cases: Dim background artwork to emphasize overlays.

Blur ​

Applies Gaussian blur (softens focus).

yaml
filters:
  blur: "3px"  # Moderate blur

Use cases: Create depth, de-emphasize background detail.

Brightness ​

Adjusts brightness level (1.0 = normal, <1.0 = darker, >1.0 = brighter).

yaml
filters:
  brightness: 0.7  # 30% darker

Use cases: Darken background, adjust visibility.

Contrast ​

Adjusts contrast (1.0 = normal, <1.0 = lower contrast, >1.0 = higher contrast).

yaml
filters:
  contrast: 0.8  # Reduce contrast

Use cases: Soften harsh edges, mute colors.

Grayscale ​

Converts to grayscale (0.0 = full color, 1.0 = completely gray).

yaml
filters:
  grayscale: 0.5  # 50% desaturated

Use cases: Monochrome displays, reduced visual weight.

Sepia ​

Applies sepia tone (warm brown tint).

yaml
filters:
  sepia: 0.3  # Slight warmth

Use cases: Vintage aesthetic, warm backgrounds.

Hue Rotate ​

Rotates colors around the color wheel (in degrees).

yaml
filters:
  hue_rotate: 45  # Shift hues by 45 degrees

Use cases: Color theme adjustments, alert states.

Saturate ​

Adjusts color saturation (1.0 = normal, <1.0 = less saturated, >1.0 = more saturated).

yaml
filters:
  saturate: 0.6  # Reduce saturation

Use cases: Mute vibrant colors, adjust visual intensity.

Invert ​

Inverts colors (0.0 = normal, 1.0 = fully inverted).

yaml
filters:
  invert: 0.2  # Slight inversion

Use cases: High-contrast themes, special effects.

Built-in Presets ​

none ​

Clear all filters (remove filtering).

yaml
# No filters applied
filter_preset: none

Best for: Removing filters, returning to unfiltered state.

dimmed ​

Reduces opacity and brightness for subtle background.

yaml
# Equivalent to:
filters:
  opacity: 0.5
  brightness: 0.8

Best for: General use, balanced visibility.

subtle ​

Light dimming with slight blur and desaturation.

yaml
# Equivalent to:
filters:
  opacity: 0.6
  blur: "1px"
  grayscale: 0.2

Best for: Maintaining detail while reducing emphasis.

backdrop ​

Heavy dimming with blur for strong overlay emphasis.

yaml
# Equivalent to:
filters:
  opacity: 0.3
  blur: "3px"
  brightness: 0.6

Best for: Data-heavy displays, prominent overlays.

faded ​

Desaturated and dimmed for muted background.

yaml
# Equivalent to:
filters:
  opacity: 0.4
  grayscale: 0.5
  contrast: 0.7

Best for: Minimal aesthetic, reduced visual clutter.

red-alert ​

Full opacity with slight warm hue rotation for alert state.

yaml
# Equivalent to:
filters:
  opacity: 1.0
  brightness: 1.2
  hue_rotate: 10

Best for: Alert states, emergency displays.

monochrome ​

Full grayscale with reduced contrast.

yaml
# Equivalent to:
filters:
  opacity: 0.6
  grayscale: 1.0
  contrast: 0.8

Best for: Professional displays, reduced color distraction.

Overlay-Only Mode ​

Create cards without any base SVG (pure overlay displays).

yaml
base_svg:
  source: "none"
view_box: [0, 0, 1920, 1200]  # REQUIRED when source is "none"

overlays:
  - type: control
    id: main_display
    # ... overlay config

Requirements:

  • view_box must be explicitly defined (4-element array)
  • No anchor extraction (all overlays need explicit coordinates)

Use cases:

  • Pure data displays
  • Custom overlay compositions
  • Testing/prototyping

Theme Overrides ​

Themes can define custom filter presets.

Theme YAML:

yaml
lcars-custom:
  name: "LCARS Custom"
  msd:
    filter_presets:
      dimmed:
        opacity: 0.3  # Override built-in 0.5
        blur: "2px"   # Add blur

      custom-preset:
        opacity: 0.4
        grayscale: 0.8
        contrast: 1.1

Card Config:

yaml
theme: lcars-custom
base_svg:
  source: builtin:ncc-1701-a-blue
  filter_preset: dimmed  # Uses theme override

Priority: Theme presets override built-in presets, explicit filters override everything.

See Also ​