Image Resampling: white background - silverstripe

I took over a Silverstripe project, so im quite new.
The end comsumer mention that the white background is not renderd white. He is right.
After the resampling the white background contains some #fefefe-pixels.
Is there a way to fix that?
The images on the demo page contains the same effect: https://demo.silverstripe.org/assets/Uploads/_resampled/ResizedImage600278-community.png
The project uses Silverstripe 3.7

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