Which channels determine transparency and look like RGB color channels, except their value represents transparency?

Which channels determine transparency and look like RGB color channels, except their value represents transparency?

• A. RGB Color Channels
• B. Luma Channels
• C. Chrominance
• D. ALPHA Channels

Answer: (D)

Transparency is stored in a separate channel that mirrors the image’s color channels but represents opacity instead of color. This extra channel, called the alpha channel, holds per-pixel values where typically 0 means fully transparent and 1 (or 255) means fully opaque. Because it’s laid out like the RGB channels—same dimensions and bit depth—it looks like another grayscale image alongside R, G, and B, but its meaning is transparency rather than color. When you composite images, the alpha value determines how much of the foreground and background mix at each pixel, often using an equation like final color = foreground color blended with the background based on the alpha. That’s why the alpha channel is used to control transparency. The other options aren’t about transparency: RGB color channels carry color information, luma channels carry brightness, and chrominance channels carry color difference information.

Transparency is stored in a separate channel that mirrors the image’s color channels but represents opacity instead of color. This extra channel, called the alpha channel, holds per-pixel values where typically 0 means fully transparent and 1 (or 255) means fully opaque. Because it’s laid out like the RGB channels—same dimensions and bit depth—it looks like another grayscale image alongside R, G, and B, but its meaning is transparency rather than color.

When you composite images, the alpha value determines how much of the foreground and background mix at each pixel, often using an equation like final color = foreground color blended with the background based on the alpha. That’s why the alpha channel is used to control transparency.

The other options aren’t about transparency: RGB color channels carry color information, luma channels carry brightness, and chrominance channels carry color difference information.