This function converts a 16-bit grayscale image to an 8-bit grayscale image using the same function as MED_display_contrast_auto_double() except that this function permanently alters the pixel values.
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AT_ERRCOUNT ACCUAPI MED_IP_contrast_auto_double(
const HIGEAR hIGear,
const LPAT_RECT lpRect,
const DOUBLE rescale_slope,
const DOUBLE rescale_intercept,
const DOUBLE gamma,
const LONG lReserved_option,
LPDOUBLE lpWindow_center,
LPDOUBLE lpWindow_width
);
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| Name | Type | Description |
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| hIGear | const HIGEAR | The HIGEAR handle to the image to convert. |
| lpRect | const AT_RECT | Use this AT_RECT structure to specify the rectangular portion of the image for which to optimize the contrast on; set to NULL for the whole image. Please see the ImageGear User's Manual if you are unfamiliar with this structure. |
| rescale_slope | const DOUBLE | Set to the value of the Data Element, Rescale Slope (0028,1053). You can use MED_DCM_DS_Rescale_get() to obtain this value. If this Data Element is not present in the Data Set, please set this value to 1.0. |
| rescale_intercept | const DOUBLE | Set to the value of the Data Element, Rescale Intercept (0028,1054). You can use MED_DCM_DS_Rescale_get() to obtain this value. If this Data Element is not present in the Data Set, please set this value to 0.0. |
| gamma | const DOUBLE | Non-linear method to adjust the contrast of DICOM image. In this method, the amount a pixel's intensity changes depends on its original intensity. Usual range is 0.75 to 3.0. |
| lReserved_option | const LONG | Reserved for future use; please set to 0 for now. |
| lpWindow_center | LPDOUBLE | A far pointer that returns a LONG for the Window Center; set to NULL if you don't need this information. |
| lpWindow_width | LPDOUBLE | A far pointer that returns a LONG for the Window Width; set to NULL if you don't need this information. |
Grayscale – 9…16 bpp.
Returns the number of ImageGear errors that occurred during the function call.
MED_display_contrast_auto_double()
MED_IP_reduce_depth_with_downshift()