How can I transfer a pic from iMac to iPhone?

Question

How can I transfer a pic from iMac to iPhone?

Answer 1

See this page:   Ways to import photos
If you have an iCloud account, turn on My Photo Stream to make new photos appear automatically in iPhoto on your device; or turn on iCloud Photo Sharing to have your shared photo streams automatically appear in iPhoto.
Sync photos from your Mac o to the Photos app on your device using iTunes. If you don’t have iTunes on your computer, you can download it for free.
Import full-resolution photos from your Mac directly into iPhoto using iTunes file sharing. Your photos appear in the iTunes album in iPhoto.
Mail you photo and save it to the camera roll from Mail.
Sync photos and video clips using iTunes
Connect your iOS device to your computer.Note:  If Wi-Fi syncing is on in iTunes, you don’t need to connect the device to your computer, but they both need to be on the same Wi-Fi network, and the computer needs to be on. For more information on Wi-Fi syncing with iTunes, see your device’s user guide.
In iTunes, select your device and click Photos at the top of the window.
Select “Sync Photos from” and select the photos you want to sync to your device.On a Mac with photos in an iPhoto or Aperture library, selecting an album or event organizes the photos as an album or event in iPhoto. You can sync your entire library or select specific albums and events.On a Windows computer, selecting a folder organizes the photos as an album in iPhoto.
If you want to sync video clips, select the “Include videos” checkbox.
Click Apply.
When the sync is complete, click next to your device, and disconnect your device.
Import photos using iTunes file sharing  (you need iPhoto on your iPhone to do this)
In iTunes, select your device and click Apps at the top of the window.
Below File Sharing, select iPhoto, and click Add.
In the window that appears, select the photos you want to import, and click Add.The photos are transferred to your device and appear in your iPhoto library the next time you open iPhoto. Photos transferred to iPhoto using file sharing appear only in the iPhoto library, not in the Photos app.