a:srgbClr (RGB Color)

Description

\:srgbClr\ defines a color using the sRGB (standard RGB) color model, a universally recognized color space. It is defined in ECMA-376 Part 1 §20.1.2.3.32.

The color value is a 6-digit hexadecimal string in format \RRGGBB:

• RR = Red component (00–FF, 0–255 in decimal)
• GG = Green component (00–FF)
• BB = Blue component (00–FF)

Common colors:

• \00000\ = Black
• \FFFFFF\ = White
• \FF0000\ = Pure Red
• \0FF00\ = Pure Green
• \000FF\ = Pure Blue
• \FFFF00\ = Yellow (Red + Green)
• \FF00FF\ = Magenta (Red + Blue)
• \0FFFF\ = Cyan (Green + Blue)

Child elements enable color modifications (transparency, tint, shade, luminance) applied to the base RGB value.

Attributes

Content Model

\:srgbClr\ can contain color modifiers:

• \:alpha\ or \:alphaOff\ or \:alphaMod: Transparency control
• \:tint\ or \:shade: Brightness adjustment
• \:lumMod\ or \:lumOff: Luminance modification
• \:comp: Complement color

Modifiers are optional and applied in sequence.

Child Elements Table

Examples

Pure Red Color

<a:srgbClr val=\"FF0000\"/>

using DocumentFormat.OpenXml.Drawing;

var redColor = new RgbColorModelHex { Val = \"FF0000\" };

RGB with Transparency (50% opacity)

<a:srgbClr val=\"0070C0\">
  <a:alpha val=\"50000\"/>
</a:srgbClr>

var blueColor = new RgbColorModelHex { Val = \"0070C0\" };
blueColor.Append(new Alpha { Val = 50000 });  // 50% opacity

RGB with Tint (20% lighter)

<a:srgbClr val=\"4472C4\">
  <a:tint val=\"20000\"/>
</a:srgbClr>

var tintedColor = new RgbColorModelHex { Val = \"4472C4\" };
tintedColor.Append(new Tint { Val = 20000 });  // 20% lighter

RGB with Shade (30% darker)

<a:srgbClr val=\"4472C4\">
  <a:shade val=\"30000\"/>
</a:srgbClr>

var shadedColor = new RgbColorModelHex { Val = \"4472C4\" };
shadedColor.Append(new Shade { Val = 30000 });  // 30% darker

RGB with Alpha Modification

<a:srgbClr val=\"FF0000\">
  <a:alpha val=\"80000\"/>
  <a:lumMod val=\"50000\"/>
</a:srgbClr>

var modifiedColor = new RgbColorModelHex { Val = \"FF0000\" };
modifiedColor.Append(new Alpha { Val = 80000 });  // 80% opacity
modifiedColor.Append(new LuminanceModulation { Val = 50000 });  // 50% luminance

Reference Tables

RGB Color Values (Common Colors)

Color Modifier Values

Notes

Element Relationships

• Parents: Used in solid fills, lines, effects, shadows, reference fills
• Color Hierarchy: sRGB is most specific color type; other types (scheme, system, HSL) are alternatives
• Children: All color modifiers are optional; applied in order specified
• Modification Order: Typically applied as: alpha → tint/shade → lumMod/lumOff

Implementation Details

• Hex Format: Always 6 digits; use leading zeros (e.g., 0070C0, not 70C0)
• Case Sensitivity: Hex digits typically uppercase but lowercase also valid
• Alpha Units: Value 0–100000 represents 0–100%; 50000 = 50% opacity
• Tint/Shade: Mutually exclusive within same color element
• Modifier Stacking: Multiple modifiers stack; order matters for rendering
• Transparency Composition: Alpha values can compound with parent container transparency
• Scheme Color Alternative: For theme support, prefer \:schemeClr\ for accent colors
• Compatibility: sRGB colors render identically across all Office applications and web browsers
• Performance: RGB colors slightly faster than scheme colors (no theme lookup)
• Print Fidelity: CMYK printers may show slight color shifts; RGB-to-CMYK conversion applied