Normally, when DropDMG is creating or converting an image, it uses the preferences shown in the Preferences window. (See Preferences for explanations of the preferences.) Sometimes you may wish to use slightly different preferences for a particular image. For instance, perhaps you usually create .dmg images, but you sometimes need to make .img images for a friend who uses Mac OS 9. You could open the Preferences window, change the image format to .img, make the image, and change the format back to .dmg. Or, you could save yourself some time by overriding the preferences.
To use override the preferences, hold down the Option key when you drag a folder or image onto DropDMG’s icon or the The Status Window. That is, click on the icon and begin dragging; then hold the Option key before you release the mouse button. After releasing the mouse button, continue holding down Option until DropDMG displays a preferences sheet with the name of your folder at the top. Any changes you make in this sheet will only affect that folder; they will not be saved. Click the OK button to use the preferences as shown, or the Cancel button to not create the image after all.
If you drop more than one item onto DropDMG, continue holding Option until a window and sheet have opened for each item. With more than one preferences sheet open, you can use the Copy to Others button to copy the settings on one sheet to the other sheets. In this way, you can quickly override the preferences to create many similar images. As a shortcut, you can hold down the Option key when clicking OK to dismiss all of the preferences sheets.