2.6.1.12 imgInvert
Contents
Menu Information
Image: Adjustments: Invert
Brief Information
Invert image color
Command Line Usage
1. imgInvert oimg:=<new>;
2. imgInvert img:=mat(1) oimg:=mat(2);
X-Function Execution Options
Please refer to the page for additional option switches when accessing the x-function from script
Variables
| Display Name |
Variable Name |
I/O and Type |
Default Value |
Description |
|---|---|---|---|---|
| Input Matrix | img |
Input Image |
|
Specifies the source image to be manipulated. The default input is the active image. |
| Output Image | oimg |
Output Image |
|
Specifies the output image. By default, the output image is the same as the input image. See the syntax here. |
Description
The imgInvert function inverts the colors in the specified bitmap, making it like a photographic negative. This function can also be used to invert the color of a 1-bit image, making the black white and the white black.
Examples
In this example, we use the imgInvert function to invert the color of the input image:
- When the input image is active, select Image: Adjustments: Invert. This opens the dialog of the X-Function.
- In the X-Function dialog, change the settings as the screenshot below and click OK to close the dialog.
A new image is created. We can see that the color is inverted.
The original image The output image
Algorithm
For gray scale image,
O(x, y) = 
- I (x, y);
For color Image,
where O(x, y) is the output pixel value, I(x, y) is the input pixel value, and Bits is Bits Per Pixel.
The computation uses L_InvertBitmap() function from LEADTOOLS Main API. Please refer to the LEADTOOLS Main API Help file, Version 14 and read the L_InvertBitmap topic.
References
LEADTOOLS Main API Help file, Version 14