Question

How the color depth and resolution of an image is related to the video memory requirement?

Answer 1

Explanation:

Video is nothing but sequence of images encoded in different technique compared to only image.

In general the memory required to store a raw image data = (width x height x bytes_per_pixel). Now this will let encoded to lesser number of bytes by a given encoder and it's parameters.

With encoder and it's encoding parameters remaining same, the encoded size is directly proportional to resolution and bytes_per_pixel (which is also color depth).

So if you increase the resolution or color depth your memory size required to store that video will increase.

This is related to normal video storage requirement.

But if you are referring to video accelerator (/GPU) related memory requirements:

video accelerator (/GPU) need to store multiple images in it's internal memory for encoding. Then as indicated earlier the memory required to store one frame of data will also increase depending on resolution and color depth.

Answer 2

Answer:

The uncompressed image size decreases as the resolution and bit depth decrease (in bits, bytes etc.). Of course, if either increases, it becomes larger. Size is calculated by multiplying resolution by colour depth (also called bit-depth)

Explanation:

Resolution is the image's HEIGHT multiplied by its WIDTH (in pixels).

The number of bits per pixel is known as colour depth, or bit-depth. If you have a 1-bit image, each pixel has $2^{1} =2$ colour options. If the image is 24-bit, you have $2^{24} = 16,777,216$ colour options per pixel.

For a 100 X 100 pixel image, with a color depth of 3-bits… the size in bits is:

(100 x 100) x 3-bits/pixel = 30,000-bits

Convert to bytes (divide by 8 since there’s 8-bits per byte)

30,000-bits / 8 = 3,750-bytes

Convert to kilobytes (divide by 1,024 since there’s 1,024-bytes per kilobyte)

3,750-bytes / 1,024 = 3.66-kilobytes

Since the human eye detects a wide range of colours while viewing a video or image, having a photo with the most colour depth or a video with the highest bit level is extremely desirable. While these factors are important in producing the most bright and eye-catching visual media, there are many others. Our articles on bit rate, video resolution, and frame rate will provide you the extra knowledge you need to evaluate video and image quality in a deeper and more nuanced way.

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