Does changing the PPI really increase or decrease the image quality? How is DPI different from PPI? What actually is Resolution? In this lesson, we will answ A standard 10 mil barcode means the narrowest bar measures 0.10 inches. For that, you would need 600dpi to make sure the resolution was high enough. See the table below for a helpful reference. Printer. 203 dpi. 300 dpi. 406 dpi. 600 dpi. Dots -1. Dots per inches (dpi) determines how many pixels the figure comprises. The default dpi in matplotlib is 100. A figure of figsize= (w,h) will have. px, py = w*dpi, h*dpi # pixels # e.g. # 6.4 inches * 100 dpi = 640 pixels. So in order to obtain a figure with a pixel size of e.g. (1200,600) you may chose several combinations of figure size and \$\begingroup\$ REF: No and no. In your second reference, it clearly shows on the webpage 3 identical kitty photos. The PPI info embedded on a jpg file is just a SMALL recommendation to the user's printer, that can be overrun, overwrite, forgotten into oblivion if the user turn on the fit to page checkbox for example. .

200 dpi vs 300 dpi