Python OpenCV: Image Basics
What are Images?
- 2-dimensional representation of the visible light spectrum
How do OpenCV store images?
- OpenCV used RGB color space by default. However, it actually stores color in the BGR format.
- Each pixel coordinate (x, y) contains 3 values ranging from 0 to 255 (8-bit)
- Mixing those primary colors produces different color spectrum.
Pixel
- Each image consists of a set of pixels.
- Pixels are the raw building block of an image.
- Each pixel in the image represent intensity of the light that appears in the given place in our image.
- Image resolution of 300 x 200 means there are 300 rows and 200 columns. Overall, there are 300 x 200 = 6000 pixels in the image.
- Pixels are represent in two ways: grayscale and color
- Color pixels are normally represented in the RGB color space – one value for the Red component, one for Green, and one for Blue
Grayscale
- In grayscale, each pixel value has a value between 0 (black) and 255 (white).
- The values in between 0 and 255 are varying shades of gray, where values closer to 0 are darker and values closer to 255 are lighter.
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