The phone's screen has an annoying yellow tint. Is there any app that can fix gamma correction ? Or shall I return the phone and get another one ? Anyone else has this ?
This picture is from XDA-Developers and explains my problem :
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This sounds reminiscent of a "feature" that's present on the S III. Try going into the Settings. In the Device section, click Display, then in the Screen section, click Screen mode. You probably want to change it from Dynamic to Standard.
(Some of these things might be named differently on the S4, in which case please edit the new names into this answer.)
Is this similar to the yellow tint issue with the S2 before? Then, it's probably a hardware issue.
Related post: What to check when buying a used device
In the link you gave, I would think that Light_Addict's issue is hardware-related. See if your shop will replace it. Try to compare it with other existing phones of the same model, using the same setting; you might want to do a factory reset so they'll believe you there's a difference in color.