1. Interrelated aspects

Potential improvement of resolution by signal amplification: Gain refers to the ratio of the image intensifier output signal (light or electronic signal) to the input signal, which reflects the ability to amplify weak light. Appropriate gain can enhance the image signal, making it easier to observe details that were originally difficult to distinguish due to weak light, thereby helping to improve the effective use of resolution to a certain extent. For example, in a low-light environment, after increasing the image brightness through gain, some small details that were originally close to the resolution limit may be distinguished.

High resolution provides the basis for effective gain: high-resolution image intensifiers can more accurately distinguish target details, and during the amplification process, these detail information can be transmitted and amplified more accurately. If the resolution is too low, the image itself is blurred in detail. Even with high gain, the amplified image is just a blurry light, and the details cannot be clearly displayed.

2. Mutual constraints

High gain may lead to reduced resolution: When the gain is too high, the noise signal in the image will be amplified, and it may cause problems such as electron scattering. In the process of electronic image amplification, excessive gain may cause the electrons to deviate from the original focusing path, resulting in image blur, thereby reducing resolution. For example, as the gain continues to increase, the image may appear "snowflake" noise, which will cover the details of the image and reduce the resolution.

Improving resolution may limit the room for gain improvement: In order to obtain high resolution, image intensifiers may need to adopt more sophisticated optical and electronic structures, such as more precise electronic lenses and smaller pixel sizes. These designs may limit the increase in gain, because finer structures may have certain limitations on signal amplification and may cause increased signal loss. For example, in order to ensure the accuracy of pixels, some high-resolution image intensifiers will adopt more conservative designs in the photoelectric conversion and electronic amplification process, so that excessive gain cannot be achieved.