Iphone 4 front camera bad picture resolution on snap chat?

When i take pictures on my normal camera for my phone on the front side, the picture comes out fine. But when i take a picture with it on SnapChat (www.snapchat.com), the pictures loses saturation, it looks more grey rather than vibrant.
i have a screen protector on my screen, but the pictures have came out clear before, even when i had the screen protector on… How can i fix the pictures' resolution?

You can't it's just how the app is

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