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as you have not mentioned you need this graphic design for web or printing I assume you asked for website so here what you can do:
The goal of an image on a website is to get it to load fast. It’s useless to have massive images on your website and it takes forever to load—especially on mobile devices using a slower connection. There is no notion of DPI on a computer screen, it’s done in pixels, not dots and inches like a printer. Without going into massive detail here, check out the Say No to 72 dpi article linked before if you’re really interested. Equally there is a good article on the Myth of DPI at the Web Designer Depot website. But to keep it simple, if you need an image to be 100 pixels by 200 pixels, make it that size, the DPI or PPI doesn’t matter if it’s just for viewing on a screen.
For more visit: http://dotmonster.co/blog/image-resolution-for-website-design-and-graphic-design
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