Images in the overview has low contrast and saturation

The images in the first view of the gallery are shown with lower contrast and saturation.
In the last gallery the was no problem like this.
I deleted the old gallery and created a new gallery with the same photos with an other filename.

How can i solve the problem.

Solution:
deleted the gallery block an insert it again.
After third retry it works fine, now.

• This topic was modified 8 minutes ago by ing0f.
• This topic was modified 7 minutes ago by ing0f.
• This topic was modified 6 minutes ago by ing0f.

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