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#include "ltwrappr.h"
virtual L_INT LBitmap::RemapIntensity(pLUT, uLUTLen, uFlags)
L_INT * pLUT; |
table of uLUTLen integers containing lookup values |
L_UINT uLUTLen; |
length of the lookup table |
L_UINT uFlags; |
flag that indicates the color channel to be affected |
Uses a lookup table to change the class object's bitmap intensity values. You can apply the change to red, green, blue, or all color channels.
| Parameter | Description | |
| pLUT | Table of uLUTLen integers containing lookup values. | |
| uLUTLen | Length of the lookup table. Possible values are: | |
| If the REMAP_NORMAL flag is used in the uFlags parameter | ||
| 2^(HighBit - LowBit + 1) | ||
| If the REMAP_NORMAL flag is not used in the uFlags parameter | ||
| Value | Meaning | |
| 65536 | 16-bit / sample image | |
| 4096 | 12-bit / sample image | |
| 256 | 8-bit / sample image | |
| uFlags | Flags that indicate: | |
| - The color plane to update. | ||
| - Whether to change the high bit or not. | ||
| - Whether the pLUT contains normal or stretched data. | ||
| You can combine values of each group when appropriate by using a bitwise OR ( | ). The following are valid values: | ||
| Flags indicate the color plane to update: | ||
| Value | Meaning | |
| CHANNEL_MASTER | [0] All channels *. | |
| CHANNEL_RED | [1] Red channel only. | |
| CHANNEL_GREEN | [2] Green channel only. | |
| CHANNEL_BLUE | [3] Blue channel only. | |
| Flag indicates whether to change the high bit or not: | ||
| REMAP_CHANGEHIGHBIT | [0x0010] Change the high bit of the bitmap (pBitmap->HighBit) according to the used data in the pLUT. | |
| Flag indicates whether pLUT contains normal data: | ||
| REMAP_NORMAL | [0x0100] The data in the pLUT is normal data, in this case the uLUTLen should be equal to 2^(HighBit - LowBit + 1). | |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
The current intensity values correspond to the table indexes. The values of the entries are the new values to be applied.
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.
The bitmap intensity level range depends on the resolution of the image:
Be sure that pLUT contains the number of the bitmap intensity levels. For example if the bitmap is 16-bit (the maximum bitmap intensity level is (2^16)-1).
This function can be used to implement end user features such as Photoshop Curves.
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
This function supports signed data images.
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))
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
L_INT LBitmap__RemapIntensityExample(LBitmap & Bitmap, L_TCHAR * pszFile){L_INT nRet;L_UINT LookupTable[256];nRet =Bitmap.Load(pszFile);if(nRet !=SUCCESS)return nRet;LookupTable[0] = 255;LookupTable[255] = 0;nRet =Bitmap.GetFunctionalLookupTable((L_INT*)LookupTable, 256, 0, 255, 0,FLT_LINEAR);if(nRet !=SUCCESS)return nRet;nRet =Bitmap.RemapIntensity((L_INT*)LookupTable, 256, CHANNEL_MASTER);if(nRet !=SUCCESS)return nRet;return SUCCESS;}L_INT LBitmap__RemapIntensity_Signed_Example(LBitmap & Bitmap){L_INT nRet;L_INT * pLookupTable = NULL; /* Array to hold lookup table*/L_INT nMaxValue, nMinValue;L_INT nLutLen;nLutLen = 1 << (Bitmap.GetHandle()->HighBit - Bitmap.GetHandle()->LowBit + 1);//Get the real LUT lengthif(!Bitmap.GetHandle()->Flags.Signed)return FAILURE; //The image should be signednMinValue = -1 * nLutLen/2; //This is the lowest expected value.nMaxValue = nLutLen/2 - 1; //This is the highest expected value.pLookupTable = (L_INT *) malloc(nLutLen * sizeof(L_INT));if(pLookupTable == NULL)return ERROR_NO_MEMORY;memset(pLookupTable, 0, nLutLen * sizeof(L_INT));/*Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - nLutLen*/if(nMinValue < 0)pLookupTable[nMinValue + nLutLen] = nLutLen/2 - 1;elsepLookupTable[nMinValue] = nLutLen/2 - 1;if(nMaxValue < 0)pLookupTable[nMaxValue + nLutLen] = -1 * nLutLen/2;elsepLookupTable[nMaxValue] = -1 * nLutLen/2;//Generate a negative LUT.nRet = Bitmap.GetFunctionalLookupTable(pLookupTable, nLutLen, -1 * nLutLen/2, nLutLen/2 - 1, 1, FLT_LINEAR|FLT_SIGNED);if(nRet !=SUCCESS)return nRet;//Invert the Image.nRet = Bitmap.RemapIntensity(pLookupTable, (L_UINT)nLutLen, CHANNEL_MASTER|REMAP_NORMAL);if(nRet !=SUCCESS)return nRet;return SUCCESS;}
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