Dark Power BI theme · passed colour-vision check

Signal High Contrast Power BI theme

High-contrast dark Power BI theme: cyan, yellow and white on true black, bold Segoe headings, for wall displays and low-vision viewing.

By Nawaf Sharaf · Founder & Reliability Engineer · Updated November 9, 2026

Free for commercial use

Signal High Contrast theme applied to the Call Centre Operations template

Shown on the Call Centre Operations template.

Power BI Desktop: Design ribbon → Import theme. Power BI service: View → Theme pane.

Design with this theme →

About the palette

Signal High Contrast is for screens viewed from across a room or by people with low vision: true black page #050505, white text at 19.4:1, Segoe UI Bold headings, and saturated cyan #33E1FF, yellow #FFE14D and white as the first three series.

Its first six colours passed the colour-vision simulation. Status colours are bright too (good #66FF99, neutral #FFE14D, bad #FF6680), so KPI cards remain readable at distance. Use it for call-centre and warehouse wallboards.

Palette profile

Computed from the colours on this page, not written by hand: hue spread, lightness range, contrast and a colour-vision simulation of the first six chart colours.

Best for

Stacked and clustered charts with up to six series: 7 hue families, and the first six colours stay apart in the colour-vision simulation.
Greyscale printing and PDF board packs: the chart colours span 60–100 % lightness, so bars stay apart without colour.
Wall displays and dark-mode screens: text at 19.4:1 and every chart colour at 6.4:1 or more on the cards.
Variance charts, waterfalls and KPI deltas: good #66FF99 and bad #FF6680 are 150° apart in hue.

Colour-vision simulation

The first six chart colours stay apart for protanopia, deuteranopia and tritanopia (OKLab distance 0.06 or more after simulation).

Chart colours: 8, in 7 hue families
Lightness range: 60–100 %
Text contrast: 19.4:1
Muted text: 13.3:1
Weakest chart colour: 6.4:1 on cards
Near-grey series: 1
Closest catalog palettes: Midnight Analytics (0.082)Winter Pine (0.085)Ward Wallboard (0.085)

Colours and contrast

Contrast ratios are measured against the card (surface) colour, where visuals sit. Text needs 4.5:1; graphics need 3:1.

Theme colours and contrast against the card colour
Role	Colour	Contrast on card	Check
Page background	#050505	—	base
Card / surface	#0D0D0D	—	base
Text	#FFFFFF	19.44:1	AA text
Muted text	#D6D6D6	13.37:1	AA text
Accent	#33E1FF	12.36:1	≥ 3:1
Good	#66FF99	15.11:1	≥ 3:1
Neutral	#FFE14D	14.93:1	≥ 3:1
Bad	#FF6680	6.91:1	≥ 3:1
Data colour 1	#33E1FF	12.36:1	≥ 3:1
Data colour 2	#FFE14D	14.93:1	≥ 3:1
Data colour 3	#FFFFFF	19.44:1	≥ 3:1
Data colour 4	#FF5C5C	6.42:1	≥ 3:1
Data colour 5	#FFA54D	9.94:1	≥ 3:1
Data colour 6	#B38CFF	7.51:1	≥ 3:1
Data colour 7	#FF7AD9	8.36:1	≥ 3:1
Data colour 8	#7AB8FF	9.37:1	≥ 3:1

Theme JSON excerpt

The downloaded file also includes text classes, visual styles and slicer, table and card defaults.

signal-high-contrast-theme.json

{
  "name": "Signal High Contrast",
  "dataColors": [
    "#33E1FF",
    "#FFE14D",
    "#FFFFFF",
    "#FF5C5C",
    "#FFA54D",
    "#B38CFF",
    "#FF7AD9",
    "#7AB8FF"
  ],
  "background": "#050505",
  "foreground": "#FFFFFF",
  "tableAccent": "#33E1FF",
  "good": "#66FF99",
  "neutral": "#FFE14D",
  "bad": "#FF6680"
}

Import this theme in Power BI Desktop

1
Download the theme
Use the Download theme JSON button above. The file is a few kilobytes and contains no images.
2
Import the theme
In Power BI Desktop open the Design ribbon → Import theme and select the file. In the Power BI service use View → Theme pane. Older Desktop builds: View → Themes → Browse for themes.
3
Check visual overrides
Visuals with manually set colours keep them. Use Format → Reset to default on those visuals to pick up the theme.
4
Add a matching background
Open the design studio with Signal High Contrast selected to build a page background in the same colours.

VizForge AI · custom visuals

Generate a custom visual for this slot

Need a chart Power BI doesn't have? Pick a slot from the sample report above and VizForge AI writes a custom visual (.pbiviz, with TypeScript source) sized to it and drawn in the Signal High Contrast colours.

Slot to replace

Line chart · 616×256 px

1, 2 or 5 credits depending on the brief · 5 free on signup. Sign in or create a free account on the next screen; the brief is saved for 30 minutes.

Brief sent to the generator (you can edit it there)

A Power BI line visual titled "Calls offered vs answered". Purpose: 15-minute intervals, two series. It sits in a 616×256 px slot on a designed report page. Match the report's brand: data colours #33E1FF, #FFE14D, #FFFFFF, #FF5C5C, #FFA54D, #B38CFF; background #0D0D0D; text #FFFFFF; font Segoe UI. Transparent visual background so the page design shows through; no visual border. The report uses the Signal High Contrast Power BI theme.

Templates in this theme

Pick the right page for Power BI themes

Download · start hereFree Power BI themes80 contrast-checked theme JSON files, light and dark.
GenerateTheme LabBuild a theme JSON from your own brand colours.
Step by stepHow to import a themeDesign ribbon → Import theme, and what to do when colours don't change.
ReferenceTheme JSON guideWhat each field in the theme file controls.
2026 changesFluent 2, Classic 2026 and style presetsHow base themes layer under your JSON, 1920×1080 pages, the Update theme banner.
Compare toolsPower BI design tools, comparedTheme generators, page designers and kits, with sourced, dated facts.
Starter kitStarter Report KitYour brand as theme JSON, backgrounds, a PBIP with sample data and AI rules, in one zip.
AIAI theme generatorDescribe the look in words; get a contrast-checked theme JSON previewed on a real template.

Backgrounds to pair with Signal High Contrast

Dark page backgrounds that sit well under this palette. Each background page has its own theme download, or keep Signal High Contrast and set the background image on top.

Need a chart Power BI doesn’t ship?

Theme colours apply to custom visuals too. Describe the chart in plain English and VizForge generates it as a .pbiviz with its TypeScript source; in the design studio, the brief for a visual slot carries this palette. See the visual catalog.

Generate a custom visual with AI · starts free →

Questions about this theme

Is the Signal High Contrast theme accessible?

Yes. Text and muted text meet WCAG AA (4.5:1) on both the page and card colours, and every data and status colour reaches at least 3:1 against the cards. Its first six chart colours also stay distinguishable in a protanopia, deuteranopia and tritanopia simulation. The full contrast table is on this page.

Which fonts does the Signal High Contrast theme use?

It uses Segoe UI Bold for headings and Segoe UI for body text. All of them are in Power BI's own font list, so the report renders the same in Power BI Desktop and in the Power BI service.

How do I import a theme JSON into Power BI?

In Power BI Desktop go to the Design ribbon → Import theme and select the downloaded .json file; in the Power BI service use View → Theme pane (older Desktop builds: View → Themes → Browse for themes). The data colours, text classes and visual defaults apply to every page of the report.

Which theme JSON schema do these themes use?

They are compiled against the current report theme schema (reportThemeSchema-2.159) and include name, dataColors, background, foreground, tableAccent, good/neutral/bad, textClasses and visualStyles.

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Background images

Page backgrounds at 1280×720 and 1920×1080 with visual positions.

Design a page in Signal High Contrast

Start the design studio with this palette, lay out your page and export a background, the theme JSON and a PBIP project that all match.

Open in the design studio →Browse templates

The design studio for Power BI. Free, in your browser, no sign-up.