5.1.6   Custom volume icon

Normally when a disk image is mounted, it shows up on the desktop with a plain white icon that looks like a hard drive. With this option checked, DropDMG will customize the icon in one of two modes:

Automatic

If the top level of the image contains an application, DropDMG will badge the application’s icon onto the white drive icon. Or, if the disk image contains a single file, DropDMG will badge that file’s icon onto the drive. DropDMG renders an optimized version of the badged icon for each size up to 512×512.

Manual

Click the Set Icon… button. You can then choose any graphic file. DropDMG will then save it as an invisible .VolumeIcon.icns in your source folder. Whenever you create a disk image from that source folder, provided that Custom volume icon is checked, DropDMG will use the .icns file to set the volume icon.

DropDMG ignores the Custom volume icon option when creating a disk image by converting.