I am taking dig photos of products that will go on the internet. Most come out beautiful with a little help from my image editor. But, when I have to take a photo of something with a lot of fine details and slanted lines, it looks terrible on the internet. It looks like stair steps the smaller the photo is, not smooth looking like the actual item. And there is often a kind of rainbow speckling of different colors where the most detail in the photo is. How do you get rid of this?