I am going back to Gallery3 to host my own picture gallery online. Now with Facebook integration, I think it is the way to go again. And I have better control over the picture size etc.
But after installing and adjusting the settings, I notice the pictures turned out to be quite noisy on Gallery3. So I dig around and found a way to fix it by adjusting GD.php to reduce the amount of sharpen GD does to the resized images. Now the pictures look similar to Flickr.
Main part is to change this file:
gallery3/system/libraries/drivers/Image/GD.php
// Amount should be in the range of 26-10
$amount = round(abs(-26 + ($amount * 0.16)), 2);
attached a screenshot of the original article.
