Declarations

procedure Set_sRGB; overload;
procedure Set_sRGB(var GammaTable: TGammaTable8Bit); overload;

Overload Details

Overload 1

procedure Set_sRGB; overload;

Populates global encoding and decoding tables with sRGB transfer functions, sets GAMMA_IS_SRGB to True, and notifies change listeners.

Overload 2

procedure Set_sRGB(var GammaTable: TGammaTable8Bit); overload;

Populates a custom 256-byte lookup table with standard forward sRGB transfer function values (linear light to sRGB space).

Parameter	Type	Description
GammaTable	TGammaTable8Bit	Target 256-byte table array to receive sRGB values.

Description

Set_sRGB populates gamma lookup tables according to the standard sRGB (IEC 61966-2-1) piecewise transfer function.

The parameterless overload populates GAMMA_ENCODING_TABLE with the forward sRGB curve (linear $\to$ sRGB) and GAMMA_DECODING_TABLE with the inverse sRGB curve (sRGB $\to$ linear), sets GAMMA_IS_SRGB to True, and invokes delegates registered with RegisterGammaChangeNotification.

Formula

For a normalized channel input $V=i/255$:

$$\text{GammaTable}[i]=\{\begin{array}{ll}\text{Round}(255\cdot 12.92\cdot V)& \text{if }V<0.0031308\\ \text{Round}(255\cdot (1.055\cdot V^{1/2.4}-0.055))& \text{if }V\ge 0.0031308\end{array}$$

Example

// Configure global gamma tables to use standard sRGB transfer functions
Set_sRGB;

See also

• SetInv_sRGB
• SetGamma
• GAMMA_IS_SRGB