The following flags indicate the channel that will be used:
Value | Meaning |
---|---|
CHANNEL_MASTER * | [0x00000000] All channels. |
CHANNEL_RED | [0x00000001] Red channel only. |
CHANNEL_GREEN | [0x00000002] Green channel only. |
CHANNEL_BLUE | [0x00000003] Blue channel only. |
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))
The following flags indicate how to treat the color value:
Value | Meaning |
---|---|
AML_VALUE_NOP | [0x00000000] No change. |
AML_VALUE_NOT | [0x00000010] Invert the color, resulting in its complement. |
AML_VALUE_0 | [0x00000020] Change all bits to 0. |
AML_VALUE_1 | [0x00000030] Change all bits to 1. |
The following flags indicate the mathematical operation to use. The operations are performed between each component (R, G and B) and nFactor:
Value | Meaning |
---|---|
AML_OP_AND | [0x00000000] Combine each pixel component value and nFactor using a bitwise AND (&). |
(pixel = pixel & nFactor) | |
AML_OP_OR | [0x00000100] Combine each pixel component value and nFactor using a bitwise OR (|). |
(pixel = pixel | nFactor) | |
AML_OP_XOR | [0x00000200] Combine each pixel component value and nFactor using a bitwise XOR (^). |
(pixel = pixel ^ nFactor) | |
AML_OP_ADD | [0x00000300] Add pixel component value to the nFactor clamping the result to the maximum allowed pixel value. |
(pixel = min(pixel + nFactor, MAX_PIXEL_VALUE) ) | |
AML_OP_SUBFACT | [0x00000400] Subtract each pixel component value from the nFactor, clamping the result to the allowed pixel range. |
(pixel = min(max(nFactor - pixel, MIN_PIXEL_VALUE), MAX_PIXEL_VALUE) ) | |
AML_OP_SUBVALUE | [0x00000500] Subtract nFactor from each pixel component value, clamping the result to the allowed pixel range |
(pixel = min(max(pixel - nFactor), MIN_PIXEL_VALUE, MAX_PIXEL_VALUE) ) | |
AML_OP_ABSDIF | [0x00000600] Calculate the absolute difference between nFactor and each pixel component value. |
(pixel = abs(pixel - nFactor)) | |
AML_OP_MUL | [0x00000700] Multiply each pixel component value by nFactor/100. |
(pixel = pixel * nFactor / 100) | |
AML_OP_DIVFACT | [0x00000800] Divide each pixel component value by nFactor/100. An error will be returned if nFactor = 0. |
(pixel = pixel * 100 / nFactor) | |
AML_OP_DIVVALUE | [0x00000900] Divide nFactor by each pixel values. If the pixel values are 0, the result set to maximum allowed pixel value. (pixel = pixel ? min(nFactor / pixel, MAX_PIXEL_VALUE) : MAX_PIXEL_VALUE) |
AML_OP_AVG | [0x00000A00] Use the average of the each pixel component value and nFactor. (pixel = (pixel+nFactor) / 2). |
AML_OP_MIN | [0x00000B00] Use the lesser of the pixel component values and nFactor: |
(pixel = min(pixel, nFactor) ) | |
AML_OP_MAX | [0x00000C00] Use the greater of the pixel component values and nFactor: |
(pixel = max(pixel, nFactor) ) |
The way MIN_PIXEL_VALUE and MAX_PIXEL_VALUE are calculated depends on the bits per pixel and whether the bitmap is signed or unsigned:
if bitmap is unsigned (most common):
if the bitmap is signed (rare case):
The following flags indicate how to treat the output value:
Value | Meaning |
---|---|
AML_RES_NOP | [0x00000000] No change. |
AML_RES_NOT | [0x00001000] Invert the color, resulting in its complement. |
AML_RES_0 | [0x00002000] Change all bits to 0. |
AML_RES_1 | [0x00003000] Change all bits to 1. |
If the uFlags is AML_OP_AND, AML_OP_OR, AML_OP_XOR, AML_OP_ADD, AML_OP_MIN, AML_OP_MUL, AML_OP_MAX, AML_OP_DIVVALUE , or AML_OP_SUBVALUE, the valid range of nFactor is:
For uFlags equal to AML_OP_SUBFACT, AML_OP_DIF, AML_OP_AVG, the valid range of nFactor is:
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