I'm new to PBase and notice that the quality of my 5.6 MP photos in one gallery in which the photos are sized down to 900x600 is not as good as the quality of my 5.6 MP photos in another gallery in which the photos are sized down to 800x537. The 900x600 photos appear pixelated, yet looking at the file size, are almost twice the size (~220 kb) as the 800x537 photos (~120 kb).
Could it be that I downsized the 900x600 photos using Irfanview and downsized the 800x537 photos using WebGems? I plan on running a test by downsizing a sample from each slideshow to the other size and also using the other batch resizing application. This should give me some answers. But it still puzzles me that a 5.6 MP photo downsized to 900x600 ends up as lower quality than a 5.6 MP photo downsized to 800x537, when the 900x600 image ends up nearly twice the file size as the 800x537 image.