To make a negative of a photo in iPhoto, you can follow these steps:
1. Open iPhoto on your Mac and select the photo you want to invert the colors of.
2. Right-click on the photo and select “Show Original File.” This will open the original photo file in Finder.
3. Right-click the file and select “Open With” and then choose “Preview” from the drop-down menu. This will open the photo in the Preview application.
4. In the Preview application, click on the “Tools” menu at the top and select “Adjust Colors” from the options.
5. A new window will appear with various sliders for adjusting the colors of the photo. Look for the “Exposure” section and find the “Black Level” slider.
6. Move the black slider all the way to the right. This will effectively invert the colors of the photo, creating a negative effect.
7. Take a moment to adjust any other color settings if desired. You can experiment with the other sliders to achieve the desired effect.
8. Once you are satisfied with the inverted colors, press “Command” and “S” on your keyboard to save the changes.
9. Choose a location on your computer to save the inverted photo and give it a new name if desired.
10. close Preview and go back to iPhoto to view the inverted version of your photo.
By following these steps, you should be able to successfully create a negative of your photo using iPhoto. Remember to save a copy of the original photo before making any changes, just in case you want to revert back to the original version later on.