L_INT LBitmap::GammaCorrectExt(uGamma, uFlags)
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.
Any value greater than 0 that represents the gamma value. This value is divided internally by 100.
Flag that indicates which color space to use. Possible values are:
|RGB_SPACE||[0x0001] Adjust the intensity of the pixel colors across the RGB color space.|
|YUV_SPACE||[0x0002] Adjust the intensity of the pixel colors across the YUV color space.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
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.
nRet =LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), 0,ORDER_BGR);
nRet =LeadBitmap.GammaCorrectExt (250, YUV_SPACE);
Medical Web Viewer .NET
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