HTableL property (Main Control)

Visual Basic example
Visual C++ 4.0 example

Syntax short HTable (long lIndex);

Overview:  Refer to Changing Brightness and Contrast.

Remarks

(Document/Medical only) Hue lookup table. This is one of the four tables that the RemapHue method uses to change the bitmap's hue, saturation and value. This property is used only if the bUseHTable parameter is set to TRUE when the RemapHue method is called and the RemapHueTablesSize property is set to 65536. Hue, Saturation, and Value levels range from 0 to 255. The current hue, saturation and value of a pixel correspond to the table indexes. If the bUseMaskTable parameter is set to TRUE when the RemapHue method is called and the MaskTableL(i) entry for a particular hue is not zero, then the hue is changed to the hue in HTableL(i). If MaskTableL(i) is 0 then HTableL(i) is ignored. For example, if RemapHue is called with both bUseMaskTable and bUseHTable set to TRUE, then if a pixel has a hue of 85 and the MaskTableL(85) is not 0, the hue of the pixel is changed to HTable(85).

Traditionally, hue ranges from 0 to 359. For the lookup table, the range of 0 to 359 is remapped to a range of 0..255. For example,

This property provides support for 16-bit grayscale and 48-bit color images. Support for 16-bit grayscale and 48-bit color images is provided only in Document/Medical toolkits.

See Also

Elements:  RemapHueTablesSize property, RemapHue method, MaskTableL property, STableL property, VTableL property, MaskTable property, STable property, VTable property, HSV_HfromRGB method, HSV_SfromRGB method, HSV_VfromRGB method, RGBfromHSV method

Topics:  Raster Images: Modifying Intensity Values