I have very little experience with images so please bare with me. I need to create 3 different levels of image resolutions for an experiment (i.e low (kind of fuzzy looking), medium, high (original looking photo), conditions). The experiment will be taking place online, so I need the image size to be 700 X 400 to fit onto the web-program that I am using. Where would you suggest I edit my photos (and what would I be editing really) in order to create 3 resolution variations of the same image?
As a professional I have access to Photoshop, so in this answer I use that, but you could use the same approach in a free alternative like GIMP.
Here we have an image in 700 × 400 px:
Then we first scale the image down to half size, 350 × 200 px using Automatic interpolation:
With this result:
And then we scale it up to the original size using Nearest Neighbor interpolation:
The result is this image which has the same size, but 1/4 of the information:
If we instead scale it down to 25% size and then scale it up to 400% we get this:
Is this what you were looking for?