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If you added pre made images, logos, or pictures to the postcard. Increasing the resolution will expand the images and make the look less fine, or sharp. Keep that in mind as you follow the next steps. If you complete these steps and t he images or art looks blocky or low quality. Then you will need to import the images at a higher resolution ( DPI ) to begin with.
But generally speaking, the steps below will allow you to save / export the postcard at a higher resolution.
If you get stuck or run into any issues, let me know.
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