02 explain 8-bit gray level image

 02 explain 8-bit gray level image

An 8-bit grayscale image is a type of digital image where each pixel's intensity is represented by 8 bits, allowing for 256 possible shades of gray, ranging from black to white.

### Key Characteristics:
- **Bit Depth**: The bit depth is 8, meaning each pixel can have one of 256 different values.
- **Gray Levels**:
  - The pixel value `0` represents pure black.
  - The pixel value `255` represents pure white.
  - Values between 0 and 255 represent varying shades of gray, with lower values being darker and higher values being lighter.
- **File Size**: The file size of an 8-bit grayscale image is larger than a 1-bit image but smaller than a color image with a higher bit depth because each pixel is stored using 8 bits.
- **Applications**: Commonly used in medical imaging, photography, and any application where color is not necessary, but the details and contrast are important.

### Example:
If you have an 8-bit grayscale image of a landscape, the sky might be represented by lighter shades of gray (higher pixel values), while shadows or dark areas might be represented by darker shades of gray (lower pixel values).

### How It Works:
- In an 8-bit grayscale image, each pixel's value directly corresponds to its brightness level. For instance, a pixel value of 128 would be a medium gray, halfway between black and white.
 
This level of detail allows for smooth transitions between light and dark areas, making 8-bit grayscale images ideal for displaying complex images with subtle variations in shading.