5. RTI-Capture

The following information describes the acquisition of raw data for the creation of RTI visualizations with the Helios S53. Further information about generating RTI visualizations with the Authentica Creator software from Truvis can be found in the Authentica Creator manual.

5.1 Placing the object

Place the object on a non-reflecting surface centrally under the lighting dome. The highest point of the object should be flush with the lower edge of the lighting dome. If necessary, use a suitable support or adjust the height of the lighting dome.

5.2 Camera settings

Make sure that the UV/VIS button is lit green. If not, press it once. Set the intensity control [x] to 1 and press the MOD/SEQ button [z] to turn on the modeling light. The color of the MOD/SEQ button changes to blue and all LED’s in the illumination dome light up continuously. The illumination dome is now in VIS-MOD mode section 4.1.2

Now you can make the settings on the camera:

• If your camera has an orientation sensor, turn it off. If it is not turned off, some images may be rotated.
• White balance: If your camera allows you to adjust the color temperature, select a color temperature of 5700K. If this option is not available, select normal daylight settings. For maximum accuracy in color reproduction, place a color checker next to the object. This allows you to apply individual white point corrections for each image when converting RAW files later.
• Image quality: RAW or TIFF with sRGB color space.
• Exposure: In general, we recommend ISO sensitivities of maximum 800 at a shutter speed of 1/60 to 1/80 and an aperture of 11 to 14.
• Interval shooting: If your camera offers this option, set the number of intervals to 48, the length of the interval to 1 second, and select one shot per interval. If you are using capture software, you may need to select longer intervals to ensure that images are transferred to your computer quickly enough.

5.3 Capture

Press the MOD/SEQ button to switch the lighting dome to VIS-SEQ mode section 4.1.1. The MOD/SEQ button now flashes green and the LED’s in the lighting dome switch off. Make sure that no other light sources illuminate the object by checking the live view of your camera. Weak ambient light is well tolerated and does not affect the result too much. If necessary, increase the light intensity by turning the intensity control. You can now start the recording process by using the interval recording function of your camera or a capture software of your choice. (In principle, you can trigger the camera manually 48 times, but this is not recommended as it may cause blurred images and slight changes in camera position).