Nearest Neighbor Interpolation
Nearest neighbor interpolation is the simplest method and basically makes the pixels bigger. The color of a pixel in the new image is the color of the nearest pixel of the original image.
Nearest Neighbor - This method of interpolation is often employed in the resampling process.
Neutral Density Filter - This light is bright enough to enable the user to employ a shutter speed that would otherwise be to slow.
Nearest Neighbor
Test Image
*default interpolation algorithm for Adobe Photoshop CS and CS2 ...
Nearest Neighbor Replication simply copies an adjacent pixel of the correct color component. It is unsuitable for any application where quality matters, but can be useful for continuous previews given limited computational resources.
Nearest Neighbor: The Nearest Neighbor interpolation is the fastest option. However, it is also the least sophisticated. It simply takes the color of a pixel and assigns it to the new pixels that are created from that pixel.
Nearest neighbor
Fastest and least accurate algorithm. Provides high scrolling speed but coarse picture.
Bicubic ...
If you click on the Resampling dropdown list at the bottom of the Image Size dialog, the top entry on the list is called "Nearest Neighbor.
There are several algorithms (nearest neighbor, bicubic, bicubic sharper, etc.) that can be employed depending on the type of image data and whether the goal is to increase or reduce file/image size.
Nearest Neighbor is fast but doesn't give the best results, Bilinear is faster and gives better results, and Bicubic, the default, is slowest but best.
Many algorithms involve looking at the pixel's nearest neighbors and coming up with some sort of an average; other algorithms are more sophisticated and take several different factors into account.
None (sometimes called 'Nearest Neighbor'): The color of each pixel is copied from its closest neighboring pixel in the original image. This often results in aliasing (the 'stair-step' effect) and a coarse image, but it is the fastest method.
I don't show the smaller image because it makes no sense. I scaled it back up to 320 x 240 to fit in the window and remain deliberately pixely (nearest neighbor resampling) as it would look if you printed from this tiny image without any resampling.
 See also: Pixel, Camera, Image, Color, Interpolation
  
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