Instructions:

1. View the picture you wish in the resolution that matches your monitor display.
2. Right+Click the image and select "Set as Desktop Background" from the dropdown menu.
3. From the "Position" dropdown select "center".
4. Color: choose a color that best suits the desired image (I use Black).
5. Then Click "Set Desktop Background".

1. View the picture you wish in the resolution that matches your monitor display.
2. Control+Click and select "Save this Image as" to your Mac.
3. Go to Apple Menu > Control Panel and select "Appearance".
4. Select "Place Picture" and locate the appropriate picture.
5. Click "Set Desktop".

1. View the picture you wish in the resolution that matches your monitor display.
2. Control+Click and select "Download image to Disk".
3. Save image to desktop.
4. Got to Apple menu > System Preferences > Personal section and select "Desktop".
5. On the "Collection" pulldown menu, go to "Choose Folder" and locate the appropriate picture.