Say I create an image of 100x100 pixels in an area of 1x1 inch in my article. Lets say, when viewing the pdf at 100% magnification on my monitor, this 1x1 inch area covers 50x50 screen pixels.
If I were to digitally zoom so that the image would cover 100x100 pixels on my monitor, would it equal the original image? Or are the new pixels being interpolated by the pdf software?
I guess I'm wondering how the image is saved in the pdf, as a scaled down version or the full version? This page implies that graphics just get higher dpi mapping: Can pdflatex (or any tex package) automatically rescale included images which have been reduced in size? It seems all data is saved...so zooming could work?
would using \pdfimageresolution overwrite the dpi values? If it does overwrite, are the images scaled to retain their size in the document?