Custom images must be in PNG format. Transparency is recommended for best appearance. Images will automatically be reduced in size to fit whatever button or location is used. Images will also take advantage of Retina display resolution.
As of Simple Control 5, your custom images can now simply be added to your photo library and you will see them as options when choosing images.
You may also add custom images as part of your iCloud Restore. Once you have the images you need in the proper format and size, first Backup to iCloud via Settings. Locate the Simple Control folder created from your iCloud backup in your iCloud directory and then simply create a folder named ‘images’ inside the Simple Control folder. Place any images you’d like to use in that folder and then Restore from iCloud . You are now able to select any images you placed there from the Choose Image panel throughout the product. All Activity graphics are able to select custom images.