Returns statistical information about the bitmap.
L_LTIMGEFX_API L_INT L_GetBitmapStatisticsInfo (pBitmap, pStatisticsInfo, uChannel, nStart, nEnd, uFlags)
Pointer to the bitmap handle that references the bitmap on which to apply the effect.
Address of the STATISTICSINFO structure variable to be updated with the image information.
Flag that indicates the channel for which to get the information. This value is ignored if the bitmap is 12 or 16-bit grayscale. Possible values are:
|CHANNEL_MASTER *|| All channels.|
|CHANNEL_RED|| Red channel only.|
|CHANNEL_GREEN|| Green channel only.|
|CHANNEL_BLUE|| Blue channel only.|
Indicates the beginning color value of the range for the evaluation.
Indicates the ending color value of the range for the evaluation.
Reserved for future use. Must be 0.
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
This function calculates statistical information about the bitmap.
nEnd parameters designate the range of colors that will be taken in consideration for producing the results. Only the values between nStart and nEnd are used for the calculation of the results. The range of each one depends on the bits per pixel of the bitmap: in the case of 8 bits per component (RGB), the range is between 0 and 255; for 16 bits, the range is 0 through 65535 for unsigned images and from -32768 to 32767 for signed images; and for 12 bits, the range is 0 through 4095.
This function supports signed data images. 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 in the Document and Medical Imaging 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.
In order to speed up widely used image processing filters in LEADTOOLS, the grayscale value (master channel) of a colored image is calculated using the following formulas:
#define CalcGrayValue(r, g, b) ((L_UCHAR)(((L_UCHAR) (((2 * (L_UINT) (r)) + (5 * (L_UINT) (g)) + (L_UINT) (b) + 4) / 8))))
#define CalcGrayValue16(r, g, b) ((L_UINT16) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8))
#define CalcGrayValue32(r, g, b) ((L_UINT32) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8))
Win32, x64, Linux.
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
/* Load a bitmap at 24 bits per pixel */
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);
/*Get statistical image information */
nRet = L_GetBitmapStatisticsInfo (&LeadBitmap, &StatisticsInfo,CHANNEL_MASTER, 0, 255, 0);
Medical Web Viewer .NET
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