How to avoid having grainy, blurry, or pixelated images
PREFERABLY DO NOT CHOOSE A ZOOMED PHOTO
Digital zoom doesn't really “zoom in” - the device or app just cropped the photo and artificially enlarged it, reducing image quality.
1. Avoid having a high ISO setting on your device
When taking photos, make sure your ISO settings are not too high.
By keeping them as low as light allows, you will reduce the risk of grainy images.
There are no magic settings, and each device handles ISO a little differently, but as a general rule, the higher the ISO sensitivity, the more digital noise and graininess you will have in your images.
2. Avoid using low resolution images
While low resolution images may look good on screen, they may not look good when printed depending on the stretch you gave them.
If a message warning of low resolution appears, reduce the image size on the page until the warning disappears. (Remember that the low resolution warning only checks the image size. It cannot detect images that are blurry, grainy, pixelated, or too dark.).
One of the main reasons for blurry images is camera shake.
You can avoid this problem by stabilizing your camera with a tripod.
Also, using a self-timer or shutter remote control can help you eliminate the shake.
If you take a photo with a phone, you become the tripod! Lean against an object if possible.
Rather than twice when taking pictures, be sure to focus on a subject.
Defocused images will not look good on paper.
If you would be doing a portrait, you should generally focus on the eyes.