To run a calibration, connect the photometer via the serial port and, immediately after turning it on press the Get Photometer button in the Monitor Center. Alternatively this can be added manually into the grid to the right of the Monitor Center. ![]() If you have a Spectrascan PR650, PR655/PR670, Minolta LS100/LS110 or a CRS ColorCAL you can perform an automated calibration in which PsychoPy ® will measure the necessary gamma value to be applied to your monitor. PsychoPy ® can also store and use information about the gamma correction required for your monitor. Screen width (pixels), screen width (cm) and distance (cm) ![]() Screen width in pixels and screen width in cm Your choice of units determines the information you need to provide: In order for this to be possible you need to inform PsychoPy ® of some characteristics of your monitor. One of the particular features of PsychoPy ® is that you can specify the size and location of stimuli in units that are independent of your particular setup, such as degrees of visual angle (see Units for the window and stimuli). ![]() Of course, the name of the monitor in the script needs to match perfectly the name given in the Monitor Center. From psychopy import visual win = visual.
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