How and why does downsampling reduces resolution in time

By downsampling we are reducing sample points per second (basically lowering the sampling rate). The time gap between adjacent samples increases as a result, hence degrading the resolution in time.

1. What happens when you downsample an image?
2. What happens when downsample?
3. Does downsampling improve image quality?
4. How does downsampling affect the spectrum?

What happens when you downsample an image?

In the down-sampling technique, the number of pixels in the given image is reduced depending on the sampling frequency. Due to this, the resolution and size of the image decrease.

What happens when downsample?

Downsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. Contrast with upsample. See sampling. (2) To decrease the color depth of a digital image; for example, from 24 bits to 16 bits per pixel.

Does downsampling improve image quality?

Downsampling an image works the opposite way. According to Adobe, when you decrease the number of pixels (downsampling), the application removes data. When data is removed the image also degrades to some extent, although not nearly as much as when you upsample.

How does downsampling affect the spectrum?

The spectrum of the downsampled signal is a stretched and scaled version of the original spectrum, but the shape is preserved because the spectral copies do not overlap. There is no aliasing.