ImageGear for C and C++ on Windows v19.10 - Updated
MED_IP_reduce_depth_with_LUT
This function takes a 16-bit grayscale image and reduces it to a 8-bit grayscale one using provided (filled) LUT or current 16x8 display LUT.
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AT_ERRCOUNT ACCUAPI MED_IP_reduce_depth_with_LUT(
HIGEAR hIGear,
const LPBYTE lpLUT,
const DWORD dwEntries
);
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| Name | Type | Description |
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| hIGear | HIGEAR | The HIGEAR handle to the image to convert. |
| lpLUT | const LPBYTE | A far pointer to the look-up table to use for reduction. Set to NULL if you want to use the display LUT. |
| dwEntries | const DWORD | A variable of type DWORD that specifies the number of entries in the LUT. This value is ignored if the display LUT is used. |
Returns the number of ImageGear errors that occurred during the function call.
Grayscale – 9…16 bpp.
The 16-bit image is discarded and replaced with the new 8-bit grayscale image.
To reduce memory requirements the LUT does not have to have a 16-bit input. dwEntries should hold the number of entries in the LUT. If there is a pixel found that can overflow the LUT it is ignored and replaced with a 0.
This function does not reduce 8-bit images. To reduce an 8-bit image, use the appropriate IG_IP_color_reduce_...() function from the baseline ImageGear API.
Once this function is called, the display LUT will be thrown away, since it is now an 8-bit image.
See also MED_IP_reduce_depth_with_downshift().