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Can someone please help me help Ernie here. I have not been able to explain things so that he’s getting what I say. Here’s my last email from him:
Resampling is BAD — the reason it is bad is that pixels are lost and quality goes down. You NEVER want to do this with a photo file version you are going to print, as you have pointed out. But pixels are data points, and to get the file size down for e-mailing some pixels have to go. This is resampling as I understand resampling. Some algorithm must choose which pixels are saved, and which pixels are lost, or new points must be created that is some sort of average in the matrix. This is smoothing, I think. The algorithms can differ, from one program to another for this smoothing.
Does this make sense? Everything I have read leads me to this conclusion. I have seen this discussed by the "all knowing" F Shippey (or is it "know it all"?). When you raise the resolution, and do no resampling, the image size is reduced to more printable size, but no pixels are lost — in other words the grid is more densely populated by data points). If you, on the other hand, were to change the dimension from say 27 inches by 36 inches (as seen on many digital cameras) to 8 inches by 10.667 inches (same proportions) and allowed resampling to take place, then pixels (and quality) would be lost.
Thanks
Resampling is BAD — the reason it is bad is that pixels are lost and quality goes down. You NEVER want to do this with a photo file version you are going to print, as you have pointed out. But pixels are data points, and to get the file size down for e-mailing some pixels have to go. This is resampling as I understand resampling. Some algorithm must choose which pixels are saved, and which pixels are lost, or new points must be created that is some sort of average in the matrix. This is smoothing, I think. The algorithms can differ, from one program to another for this smoothing.
Does this make sense? Everything I have read leads me to this conclusion. I have seen this discussed by the "all knowing" F Shippey (or is it "know it all"?). When you raise the resolution, and do no resampling, the image size is reduced to more printable size, but no pixels are lost — in other words the grid is more densely populated by data points). If you, on the other hand, were to change the dimension from say 27 inches by 36 inches (as seen on many digital cameras) to 8 inches by 10.667 inches (same proportions) and allowed resampling to take place, then pixels (and quality) would be lost.
Thanks
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