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resolution
Resolution for images should be set at 300 ppi for print and 72 ppi for screen based working. Although 72 pixels per inch is now not the standard for monitors, it remains the web standard.
300 ppi would relate to 300 dpi in print, 驶d始 replacing pixels for dots, which this image represents in both senses. Set up as 300 ppi in Photoshop which printed in 300 dpi.
This image is 72 ppi which is used for screen based images. Setting the resolution so low has negative effects on the image as shown here.