HSV_HfromRGB method (Main Control)
|
Builder Syntax |
|
|
Delphi Syntax |
|
|
Overview |
Refer to Changing Brightness and Contrast. |
Remarks
Returns the corresponding Hue of a standard Windows COLORREF (cr).
Traditionally, hue ranges from 0 to 359. For HSV_HfromRGB, the range of 0 to 359 is remapped to a range of 0..255. For example,
|
Color |
Hue (0..359) |
Hue (0..255) |
|
Red |
0 |
0 |
|
Green |
120 |
85 |
|
Blue |
240 |
170 |
The standard Windows values for COLORREF (cr) represent either red, green, and blue color values, or an index into the bitmap's palette. A COLORREF value with the format $00BBGGRR represents the blue, green, and red color values for the specified pixel, where $BB is the blue value, $GG is the green value and $RR is the red value. If $01000000 is set in the COLORREF value ($010000ZZ), the lower 8 bits ($ZZ) represent an index into the bitmap's palette, which holds the color value. You can specify a COLORREF value (the return value of the RGB function), or you can specify a palette index as explained in Using Palette Indexes as Color Values. Please note that just because an image has a palette, does not mean the value returned by this property is a palette index.
See Also
|
Elements: |
|
|
Topics: |
|
|
|
|
|
|