In this project, you are asked to re-sample a 2D digital image. The specific req

Question

In this project, you are asked to re-sample a 2D digital image. The specific requirements are: Down-sampling: Given an image, you are asked to down-sample the image by three times in both x-axis and y-axis. Please consider both center value and average value as the intensity of each new pixel. Up-sampling: Given an image, you are asked to up-sample the image by three times hi both x-axis and y-axis. Please consider both constant value and bi-linear (BL) interpolation in each pixel-block (k = 1,2, ... 8). For bi-linear interpolation, you will need to consider three neighboring pixels (B, C, D) from the original image.

Explanation / Answer

Resizing in steps can certainly be used as a method to get better results, especially if doing a single step reduction introduces Moiré patterns, but other than that, I have found it makes little real difference. They will both be the same quality, (as they will have exactly the same number of pixels) although you might prefer one as opposed to the other - the results will be very slightly different, but not significantly so. But hey don't listen to me, give it a go, experimentation is fine. If you must alter the DPI then make sure you turn off resampling (or 'resize image').. this way the image won't be resized. Basically you don't want the image to be resized, as this could slightly deteriorate the quality of the print. But you don't need to resize the image or change the DPI. Just print it at the size you want and everything will be handled automatically. Most editing software has easy to use Print Preview dialogs for doing this. Similarly, if you are taking the digital images to a photo lab.. you just tell them what size to print them at. You shouldn't need to make any changes to the digital images. If you have any doubts about this.. or you are getting conflicting advice.. then check out this article. It explains it a lot better than I can:

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