Originally posted by attack11 i don't mean to nit pick this topic, but the first few replies are basically misinformation. dpi matters. these are raster images, not vector. period.
The dpi or ppi at which your image is displayed matters, yes. The dpi value in the file, however, is just a hint for how the file should be displayed. It doesn't change the actual pixel dimensions of the image in any way. Although as mentioned, some applications do follow the hint for default view, that isn't relevant at all to the amount or quality of data in the image.
Quote: defaultly windows is running at 96dpi for viewing distance compensation. macs used to be 72dpi, dunno what they are set to today.
This is even worse. The DPI value in your OS is
supposed to match the
actual ppi of your monitor. Since Apple had control of the hardware, it in fact did. Before modern monitor connections where the info can actually be probed, Windows had to guess. Since the guess was often wrong, it alloweds you to change the value. Then people got in the horribly habit of using this as a way to change the relative scale of their fonts, and a big mess ensued. I assume this is the "viewing distance compensation" you mention. Don't do that. Set your operating environment's setting for the monitor's dpi/ppi correctly and leave it.