Loads a dark frame. The software will display a file dialog so you can choose the file you want to load. A dark frame calibration is automatically applied to all CCD Images that are loaded thereafter.
载入一个暗场图片。该软件将显示一个对话框，你可以选择你想要载入的暗场图片。此后载入的所有CCD图片将针对此暗场图片做校正。
Note that the integration time and CCD temperature of the dark frame must be identical to the integration and CCD temperature of the image that will be calibrated.
注意：暗场图片的CCD积分时间和温度必须与今后要校对的图片一致。
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