![]() The image hasn't changed, just the area it covers. If I change my mind and draw it in a square 4 inches by 4 inches, then the effective resolution is 250 dpi. So if I have an image which is 1000x1000 pixels, and I draw it in a 1 inch square, then the effective resolution of the image is 1000 dpi. ![]() The effective resolution is given by dividing the dimension by the number of pixels in the image in that dimension. At this point there is no resolution, the pixels are laid down in a specific media size. These are then drawn onto the underlying media. ![]() In PDF the image is simply a bitmap, a sequence of coloured pixels. The reason is that the images have a different effective resolution. In one case the image is ~48 MB and in the other its around 200 MB. However in your case both the files consist of nothing but an image. As fmw42 says PDF files themselves have no resolution.
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