TImageEnProc.Intensity
Declaration
procedure Intensity(LoLimit, HiLimit, Change: Integer; UseAverageRGB: Boolean; DoRed, DoGreen, DoBlue: Boolean);Description
Change the value of a pixel by an amount determined by the input Red, Green and Blue channel RGB values individually, or as an averaged value. The change is graduated starting from LoLimit, with a maximum change applied to the midpoint between LoLimit and HiLimit, then reduced again to HiLimit.Typically this method can be used to effectively progressively brighten or darken any range of colors as requested without affecting colors outside the range. RGB values in the range of 0 to 127 are considered as darker, and 128 to 255 as lighter.
| Parameter | Description |
|---|---|
| LoLimit | The start point of the range (value between 0 and 255) |
| HiLimit | The end point of the range (value between 0 and 255) |
| Change | The maximum or minimum value to be applied to the midpoint, and used to determine the slope of the increment/decrement used over the range (value between -255 and 255) |
| UseAverageRGB | If True, uses the average value of the input Red, Green and Blue channels to determine the amount to change all RGB channels of the pixel |
| DoRed, DoGreen, DoBlue | If True, changes are applied to that RGB channel |
Note: If the image PixelFormat is not ie24RGB, it will be converted
Demo
 | Demos\ImageEditing\EveryMethod\EveryMethod.dpr |
Examples
// Apply an Intensity gradient dropping to -24, to the Red RGB channel only, when Red values are between 20 and 127ImageEnView1.Proc.Intensity( 20, 127, -24, False, True, False, False );
// Load test image
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );
// Apply an Intensity gradient peaking at +40 to all RGB values between 80 and 255
ImageEnView1.Proc.Intensity( 80, 255, 40, False, True, True, True );
