LBitmap::GammaCorrectExt (original) (raw)

Summary

Adjusts the intensity of colors in a bitmap by changing the gamma constant that is used to map the intensity values. Either of two different color spaces can be specified.

Syntax

#include "ltwrappr.h"

L_INT LBitmap::GammaCorrectExt(uGamma, uFlags)

Parameters

L_UINT uGamma

Any value greater than 0 that represents the gamma value. This value is divided internally by 100.

L_UINT uFlags

Flag that indicates which color space to use. Possible values are:

Returns

Comments

This function is like the LBitmap::GammaCorrect function, but has been extended to allow the specification of the color space to be used.

Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is equal. For example, we would see a change from 0.1 to 0.2 as being equal to a change from 0.2 to 0.4.

Gamma is a standard constant that is used to calculate the progression. For most CRTs the gamma constant is in the range of 2.2 to 2.5.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

• LTIMGCLR
• For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions

• LBitmap::GammaCorrect
• LBitmap::ChangeIntensity
• LBitmap::ChangeContrast
• LBitmap::HistoContrast
• LBitmap::StretchIntensity
• LBitmap::RemapIntensity
• LBitmap::Invert
• LBitmap::ChangeHue
• LBitmap::ChangeSaturation
• LBitmap::HistoEqualize
• LBitmapBase::Fill
• LBitmapBase::GetPixelColor
• LBitmapBase::PutPixelColor
• LBitmap::GetHistogram
• LDialogColor::DoModalGammaAdjustment
• LBitmap::WindowLevel
• LBitmap::WindowLevelExt
• LBitmap::ChannelMix
• LBitmap::Deinterlace
• LBitmap::Desaturate
• LBitmap::EdgeDetectStatistical
• LBitmap::LightControl
• LBitmap::SmoothEdges
• LBitmap::LocalHistoEqualize
• LBitmap::AddWeighted
• LBitmap::ColorMerge
• LBitmap::ColorSeparate
• LBuffer::ConvertColorSpace
• LBitmap::Multiply
• LBitmap::AutoColorLevel
• LBitmap::ColorLevel
• LBitmap::Correlation
• LBitmap::GrayScaleToDuotone
• LBitmap::GrayScaleToMultitone
• LBitmapRgn::HolesRemovalRgn
• LBitmap::SelectiveColor
• LBitmap::Skeleton
• LBitmap::ChangeHueSatInt
• LBitmap::ColorReplace
• LBitmap::ColorThreshold
• LBitmap::MathFunction
• LBitmap::Segment
• LBitmap::AdaptiveContrast
• LBitmap::ApplyMathLogic
• LBitmap::ColorIntensityBalance
• LBitmap::ColorizeGray
• LBitmap::ContBrightInt
• LBitmap::DigitalSubtract
• LBitmap::DynamicBinary
• LBitmap::EdgeDetectEffect
• LBitmap::FunctionalLight
• LBitmap::MultiScaleEnhancement
• LBitmap::SelectData
• LBitmap::ShiftData
• LBitmap::Skeleton2
• LBitmap::EdgeDetectStatistical2

Topics

• Raster Image Functions: Modifying Intensity Values
• Changing Brightness and Contrast
• Raster Image Functions: Doing Color Space Conversions
• Raster Image Functions: Changing Brightness and Contrast

Example

L_INT LBitmap__GammaCorrectExtExample() { L_INT nRet; LBitmap LeadBitmap; nRet =LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), 0,ORDER_BGR); if(nRet !=SUCCESS) return nRet; nRet =LeadBitmap.GammaCorrectExt (250, YUV_SPACE); if(nRet !=SUCCESS) return nRet; return SUCCESS; }

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