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Take out red eye. Size the photo appropriately. Print the photo. Submit it before 6 months is up.
If you ended up with red eyes in your photo, you can remove them digitally with a photo editing tool. However, that is the only digital alteration you are allowed to make. Generally, all you need to do to take out red eye is to select the red eye removal tool in the photo editor of your choice and then click on each eye. Some editors even remove it automatically. Your passport photo needs to be sized according to your country's regulations. Google "[Your Country Name] passport photo size" to learn more. For instance, for the US, the photo needs to be 2 by 2 inches (5.1 by 5.1 cm), and your face needs to be 1 by 1.375 inches (2.54 by 3.49 cm) in length from top to bottom. You can use the State Department's tool to adjust your photo at https://travel.state.gov/content/dam/passports/content-page-resources/FIG_cropper.swf. You upload a photo and then adjust your photo to fit in the given outline. You can print the photo at home, as long as you have photo paper and your printer prints cleanly. Make sure the photo is clear and not pixelated. You can also print it off at a drugstore for less than $1 USD. Some apps, such as the Passport Photo Booth, will help you take the photo, and then they will send you a printed photo by mail for about $6 USD. The photo for your passport photo needs to be recent, specifically taken with the last 6 months. Therefore, make sure you get your application submitted before that time is up. Make sure you submit the appropriate number of photos -- you'll often need to submit more than 1 copy!