ColorAlgebra | Graphics32

Declaration

pascal

function ColorAdd(F, B: TColor32): TColor32;
function ColorSub(F, B: TColor32): TColor32;
function ColorDiv(F, B: TColor32): TColor32;
function ColorModulate(F, B: TColor32): TColor32;
function ColorMax(F, B: TColor32): TColor32;
function ColorMin(F, B: TColor32): TColor32;
function ColorDifference(F, B: TColor32): TColor32;
function ColorAverage(F, B: TColor32): TColor32;
function ColorExclusion(F, B: TColor32): TColor32;
function ColorScale(F, B: TColor32): TColor32;
function ColorScreen(F, B: TColor32): TColor32;
function ColorDodge(F, B: TColor32): TColor32;
function ColorBurn(F, B: TColor32): TColor32;
function BlendColorAdd(F, B: TColor32): TColor32;
function BlendColorModulate(F, B: TColor32): TColor32;

Parameters

Parameter	Type	Description
`F`	`TColor32`	Foreground pixel color.
`B`	`TColor32`	Background pixel color.

Returns

Type	Description
`TColor32`	The blended 32-bit ARGB result color.

Description

This group of functions implements color channel arithmetic and Photoshop-style compositing blend modes between foreground color $F$ and background color $B$ .

Available Blend Modes

Name	Formula / Operation	Description
`ColorAdd`	$min (255, F_{c} + B_{c})$	Additive blending with channel saturation.
`ColorSub`	$max (0, B_{c} - F_{c})$	Subtractive blending with zero clamping.
`ColorDiv`	$min (255, (B_{c} \cdot 255) / F_{c})$	Division of background by foreground.
`ColorModulate`	$(F_{c} \cdot B_{c}) / 255$	Multiplicative modulation (darkening).
`ColorMax`	$max (F_{c}, B_{c})$	Component-wise maximum color selection.
`ColorMin`	$min (F_{c}, B_{c})$	Component-wise minimum color selection.
`ColorDifference`	$\| F_{c} - B_{c} \|$	Absolute channel difference.
`ColorAverage`	$(F_{c} + B_{c}) / 2$	Component-wise average.
`ColorExclusion`	$F_{c} + B_{c} - \frac{2 \cdot F_{c} \cdot B_{c}}{255}$	Exclusion blend mode (soft contrast inversion).
`ColorScale`	$(F_{c} \cdot B_{c}) / 255$	Scaled multiplication.
`ColorScreen`	$255 - \frac{(255 - F_{c}) (255 - B_{c})}{255}$	Screen blend mode (lightening blend).
`ColorDodge`	$min (255, \frac{B_{c} \cdot 255}{255 - F_{c}})$	Color dodge blend mode (brightening).
`ColorBurn`	$255 - min (255, \frac{(255 - B_{c}) \cdot 255}{F_{c}})$	Color burn blend mode (darkening).
`BlendColorAdd`	`ColorAdd` modulated by $F_{a}$	Additive blending modulated by foreground alpha.
`BlendColorModulate`	`ColorModulate` modulated by $F_{a}$	Multiplicative modulation modulated by foreground alpha.

INFO

All these functions are actually delegates; At startup, Graphics32 binds them to the optimal implementation (Pure Pascal, x86/x64 assembly, or SSE2 vector instructions) supported by the host CPU.

Declaration ​

Parameters ​

Returns ​

Description ​

Available Blend Modes ​

See also ​

Declaration

Parameters

Returns

Description

Available Blend Modes

See also