Why are the images without contrast?

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We would like to serve data as they are, without uncontrolled changes, because it is almost impossible to set color balance to one fitting all places in the world and all groups of users. You can still tweak contrast in several ways.

You can choose different “Style” configuration.

Figure 1: Raw picture.

Configure atmospheric correction setting either to DOS-1 or to “Full”.
Figure 2: Atmospheric correction set to DOS-1.

You can tweak "Gain" (brightness), "Offset", and "Gamma" (contrast), or use "Enhanced" to automatically equalize the image.
Figure 3: Gain, Offset, and Gamma adjusted to desired values.

If you choose RGB advance style, you can even tweak each color band separately.
Figure 4: Tweaking B03 band.