在手持相机拍摄的情况下，也可以增加感光元件的感光度。 但要注意感光值增加之后图片的噪点也会增加，你要知道你的相机在感光值增加到什么程度时产生的噪点就不可接受了。
Alternatively, increase the sensitivity of the sensor to hand-hold the camera, but be aware at what setting, noise (unattractive speckled patterns) will become a problem with your sensor.
碘离子掺入到亚表层可增加乳剂的光吸收，提高感光度，增加反差。
The adding of the iodide ions into the subsurface layer of the silver halide crystal could increase the light absorption, sensitivity and contrast of the emulsion.
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