Certified Professional Photographer (CPP) Practice Exam

In an 8-bit image, what value represents pure black?

1. 0

2. 128

3. 255

4. 64

The correct answer is: 0

An 8-bit image can represent a total of 256 different color values, ranging from 0 to 255. In this context, the value '0' specifically represents pure black. This is standard in digital imaging where colors are often represented in RGB format, where the absence of light is indicated by a value of zero. Conversely, the maximum value of '255' represents pure white, while all other values signify varying shades of gray or colors, depending on the specific color model being used. Therefore, when identifying pure black within the confines of an 8-bit image, the value '0' is essential as it denotes the lowest intensity of brightness.