67 to 520, but stored as a 16-bit image (with potential values ranging from 0 to 65535), the default display range is also 0=black, 65535=white, and values in between scaled linearly. If your image has intensity values ranging from e.g. In other words, it is unlikely that your image is actually all 0 values, but rather the display range is probably not set to align with the data range.
You can verify whether the actual data is there by moving the mouse over the image, and looking at the pixel probe output in the status bar area of the main ImageJ window. You can fix this by clicking on Image ▶ Adjust ▶ Brightness/Contrast. For example, on a 12-bit camera, the largest possible intensity value is 4095-but with 0 mapped to black and 65535 mapped to white, 4095 ends up (linearly) mapped to a very very dark gray, nearly invisible to the human eye. In that case, the display is scaled to the full 16-bit range (0 - 65535 intensity values), even though the actual data values typically span a much smaller range. This problem can arise when 12-bit, 14-bit or 16-bit images are loaded into ImageJ without autoscaling. From the ImageJ wiki's Troubleshooting page:
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