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LBitmap::ApplyLinearVOILUT

#include "ltwrappr.h"

virtual L_INT LBitmap::ApplyLinearVOILUT(fCenter, fWidth, uFlags)

L_DOUBLE fCenter;	/* window center*/
L_DOUBLE fWidth;	/* window width*/
L_UINT uFlags;	/* flags*/

Sets up the paint or paint & image processing functions' window leveling options for a specific bitmap through a linear transformation described by window center and width.

Parameter	Description
fCenter	Window Center for display.
fWidth	Window Width for display.
uFlags	Flags which determine the behavior of this function. Use one value or use a bitwise OR ( | ) to combine values.Possible values are:
	Value	Meaning
	VOI_LUT_UPDATE_MIN_MAX	[0x0001] Recalculate pBitmap->MinVal based on the minimum intensity inside the bitmap and recalculate pBitmap->MaxVal based on the maximum intensity inside the bitmap.
	VOI_LUT_REVERSE_ORDER	[0x0002] Fill the bitmap display LUT in reverse order (light to dark instead of dark to light).

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function sets up the paint or paint & image processing functions window leveling options for a specific bitmap through a linear transformation described by window center and width. In the DICOM world, this is referred to as "applying a linear VOI LUT".

This function will remap the LUT used to display and process a bitmap by applying the linear transformation described by window center and window width. In the DICOM world this is referred to as applying a "linear VOI LUT". The DICOM standard states:

"Window Center and Window Width specify a linear conversion from stored pixel values (after any Modality LUT or Rescale Slope and Intercept specified in the IOD have been applied) to values to be displayed. Window Center contains the input value that is the center of the window. Window Width contains the width of the window." Please see "VOI LUT Module Attributes" in the DICOM standard for more details.

This function does not change the image data: it only updates the entries inside the bitmap LUT.

Its recommended to always set the VOI_LUT_UPDATE_MIN_MAX flag.

In the DICOM world you will need to set VOI_LUT_REVERSE_ORDER flag if the photometric interpretation of the image is "MONOCHROME1", where the minimum grayscale value is intended to be displayed as white after any VOI gray scale transformations have been performed.

This function supports 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.

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.

Required DLLs and Libraries

LTIMGCOR For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:	LBitmap::AdjustTint, LBitmap::GammaCorrectExt, LBitmap::RemapIntensity, LBitmap::ApplyLinearModalityLUT, LBitmap::ApplyVOILUT, LBitmap::ApplyModalityLUT, Class Members
Topics:	Raster Image Functions: Modifying Intensity Values
	Processing an Image
	Changing Brightness and Contrast
	Raster Image Functions: Changing Brightness and Contrast

Example

For an example, refer to LBitmap::ApplyVOILUT.