<blockquote><font class="small">In reply to:</font><hr /><p>As for too dark? I admit, my images are sometimes darker than the mainstream pictures. But, that is how i perceive Mars to look ( it is a personal choice of mine i guess, i could make them brighter with very little effort. ). many people forget how far away it is from the Sun. We have been used to unnaturally light Mars images in the past in my view.<p><hr /></p></p></blockquote><br /><br />That's quite an interesting problem, because brightness, like visual perception in general, is subjective. The eye has an enormous dynamic range (we can see in blazing equatorial sunlight, and still make out details in a room lit by a single small LED) and adjusts itself. So I think it must be quite difficult for anyone to decide how bright an image "should" be. Mars is at about 1.5AU, so the solar irradiance should be about 1/2.25(?).<br /><br />Lowell once calculated that the Mars surface temperature should be "as balmy as Southern England", gawd bless 'im. While that's rather wide of the mark, I'd think the brightness of the Sun might be equivalent at the very least to a dull day in this sceptred isle <img src="/images/icons/smile.gif" />