Applying image filters

After we load the external images as input, we can start to apply effects to the images. The first few effects are image filters similar to what you can find in software such as Photoshop. We will explore a few of them.

The first one is the invert filter. It inverts the color for each pixel in the image. For testing, you can use image, video, or live stream. In the example, we use a pix_image object. The object to perform the invert filter is pix_invert. The invert filter will compute the new color for each pixel and for each RGB value by using 1 to subtract the original color value. The dark area becomes light. And the light area becomes dark.

For example, if the original pixel color is red, (1, 0, 0) in RGB, the inverted color will be (1-1, 1-0, 1-0) or (0, 1, 1). It is the color cyan.

Here is what you would expect with the use of the pix_invert object. It is the same as the invert filter when you work with Photoshop.

The next object is pix_2grey that converts the original...