How to create a border around an image for projection
If the edges of your photo are very dark, you may want to create a thin line around the photo to separate it from the black background that appears during screening.
Adding a border in Photoshop
Note: With this method, a border is added around your existing photo, so you don’t have to worry about any of the photo edge being covered by the border.
In Photoshop
1. In the taskbar at the top of the screen, click on Image and then Canvas Size in the dropdown menu. Click the Relative box.
2. Make sure the anchor point (the round dot in the graphic) is in the center, and then enter a number in the Width and Length boxes (3-5 pixels is about right).
3. Select White from the Canvas extension color. Or, if you’d like a different color, click on the arrows to get a dropdown menu. Click on Other to bring up the Color Picker. You can now select a light color of your choice. Suggestion: Choose a color that complements one of the colors in your photo.
4. Click OK and proceed to the resizing steps above.
In Photoshop Elements
1. On the taskbar, go to Edit workspace and then to Image > Resize > Canvas Size.
2. Follow the steps above.
Adding a border in Apple Photo:
Go to Apple Support at: https://support.apple.com/guide/preview/resize-rotate-or-flip-an-image-prvw2015/mac
Adding a border in Lightroom:
Lightroom doesn’t have a good system for adding a border to a photo, so if you have access to Photoshop, you should use it.
If you must use Lightroom, go to https://laurashoe.com/2013/10/11/how-to-create-photo-borders-in-lightroom for the best instructions. You should note, however, that Lightroom will create a border that covers pixels at the edge of your photo. That’s something to keep in mind if you choose to add a border wider than a few pixels. This method also produces a border with rounded corners, which you may not like.
After you’ve added a border in the Develop module, go back to the Library module and click on Export. In the dialog box that appears, size the image as described above.