Have you tried altering the brightness contrast on your Laptop? Most laptops are set to low, for power saving. Should be a function key to press and hold, then press one of the f keys, should be a logo on the function keys F1 through to F12 For brightness / Contrast.
it may also be a combination of Fn and the left/right or up/down arrow keys .
have you been able to try putting the pics onto a different computer to see if they remain the same .
also anthonys idea of uploading a pic here for us to check is a very good one.
to upload, click the paperclip in the reply box and browse to an image from the window that opens, click upload and make your post,
we can download it and see how it looks in our photo gallery and other viewers for you.