Contrast effect
Increases or decreases the contrast of an image.
The CLSID for this effect is CLSID_D2D1Contrast.
The contrast function modifies each color channel value using two, piecewise quadratic polynomials that meet with slope continuity at the point (0.5, 0.5).
Example images
This example shows the output of the effect with maximum contrast applied (Contrast = 1.0).
Before
After
Sample code
ComPtr<ID2D1Effect> contrastEffect;
m_d2dContext->CreateEffect(CLSID_D2D1Contrast, &contrastEffect);
contrastEffect->SetInput(0, bitmap);
contrastEffect->SetValue(D2D1_CONTRAST_PROP_CONTRAST, 0.5f);
contrastEffect->SetValue(D2D1_CONTRAST_PROP_CLAMP_INPUT, TRUE);
m_d2dContext->BeginDraw();
m_d2dContext->DrawImage(contrastEffect.Get());
m_d2dContext->EndDraw();
Effect properties
The properties for the contrast effect are defined by the D2D1_CONTRAST_PROP enumeration.
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows 10 [desktop apps | Windows Store apps] |
Minimum supported server | Windows 10 [desktop apps | Windows Store apps] |
Header | d2d1effects_2.h |
Library | d2d1.lib, dxguid.lib |
Related topics
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