Why do animes have this "milky"-like texture? So I've always noticed this for years watching anime, I always look at anime characters and they seem to have to kind of milky/blurry texture on their skin/clothes. It's not to noticeable to some people, but hopefully you can see what I mean with these pictures. 

(Click the pictures and zoom in for a better idea of what I mean.)





I copy and pasted the pics in Photoshop and used the eye drop tool on different areas of the skin and clothes. The color codes jump around everywhere so they can't be solid.

Could it be that these frames were scanned in at a certain DPI? Maybe something as a result of an editing software like After Effects? Or maybe it's the texture of the paper?
This happens if you encode a video with a lossy codec. In each frame the solid colors are actually drawn solid. But at the moment where they get converted into a video, a lossy compression is used. Lossy data compression discards some data from each frame so it becomes small (within the meaning of computer memory) enough to be stored on for example a DVD or so it is possible to stream them over the internet.


  Compression artifacts occur in many common media such as DVDs, common
  computer file formats such as JPEG, MP3, or MPEG files, and some
  alternatives to the compact disc, such as Sony's MiniDisc format.
  Uncompressed media (such as on Laserdiscs, Audio CDs, and WAV files)
  or losslessly compressed media (such as FLAC or PNG) do not suffer
  from compression artifacts.


If you look close to the image you can see some kind of a square pattern (two are highlighted with circles), also called artifacts, that appears if you use lossy compression.



A other effect that occurs is that the color is changing. Here is a example where the left image is a lossless png file and the right image a very high compressed jpg image:



The image to the left needs 168 KByte on the disc while the right only needs 2 KByte. If you want to know the reason why these artifacts are appearing, read the articles I provide below.

Information and image from Wikipedia and more information from Wikipedia.