I've used the parameter in the image resize tab to set the interpolation method.
And in the preferences you can set your default interpolation method:
I've made an original 300 px wide picture with the previously shown grid and a few dots. This is my original image:
And this is how it looks like when I resize it in the three different basic methods: Nearest Neighbor, Bilinear and Bicubic
[[ Note: there are much more methods. Even more then Adobe uses. ]]
Click to see its original size. (otherwise you are distracted by the image-resize-interpolation that your browser uses. That is for IE and FireFox also the Nearest Neighbor technique)
As you can see, there are (many) lines missing in the NN method.
Q: Concerning the NN method, why is the number of horizontal dropped lines not equal to the number of vertical dropped lines?
A: Because the origin is not the left upper corner, but (I guess) the center of the image. Therefore, the origin could be shifted towards the horizontal lines in another way then it shifted towards the vertical lines.
Now watch how blurry an image gets when you resize it BL or BC. There aren't many differences between them, so I made you a difference map to show them:
[[Note: Difference maps are created by setting the blending mode of the top layer to Difference. Underneath it should be the layer you want to compare it to. ]]
I could explain all what it means (Bicubic and Bilinear etc.), but that isn't the Issue here.. So I'll save you from reading a too long theoretical piece of crap...
(( Afcourse I can Imagine some people are already skipping these post ^^ ))
Anyway, I like helping you out with my knowledge. So feel free to question me...
IMP...
