That's awful. What program are you using? It has horrible jpeg compression settings.
You're giving us few details, which makes it very hard to diagnose. The fact that it's your dad's computer means nothing, since we don't know what operating system, version, or programs either of you use. Simplest answer may be that his colors are on a low setting, but that would make ALL images look like that.
What browser is he using? How old is the computer?
It sounds like your dad's computer is old and/or using old settings/software. But that's all I can speculate about.
Also, please only post one time. We will get to your question.
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