AppleScript droplet to pad images with a 10 pixel black border. Most of this is straight from the image processing template in the Script Editor except for line 92-99. To use make a new script, paste this in and save choose application as type.

pad-border.app

(* 
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc. ("Apple") in consideration of your agreement to the following terms, and your use, installation, modification or redistribution of this Apple software constitutes acceptance of these terms. If you do not agree with these terms, please do not use, install, modify or redistribute this Apple software.

In consideration of your agreement to abide by the following terms, and subject to these terms, Apple grants you a personal, non-exclusive license, under Apple's copyrights in this original Apple software ( the "Apple Software" ), to use, reproduce, modify and redistribute the Apple Software, with or without modifications, in source and / or binary forms; provided that if you redistribute the Apple Software in its entirety and without modifications, you must retain this notice and the following text and disclaimers in all such redistributions of the Apple Software. Neither the name, trademarks, service marks or logos of Apple Inc. may be used to endorse or promote products derived from the Apple Software without specific prior written permission from Apple. Except as expressly stated in this notice, no other rights or licenses, express or implied, are granted by Apple herein, including but not limited to any patent rights that may be infringed by your derivative works or by other works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION ) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND / OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT ( INCLUDING NEGLIGENCE ), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Copyright ( C ) 2011 Apple Inc. All Rights Reserved.
*)

(* INSTRUCTIONS
This droplet is designed to process one or more files, or folders containing files, whose icons are dragged onto the droplet icon.
The droplet processes recursively, and will examine the contents of every folder and every sub-folder within those folders, to find and process any appropriate files found.
To use, replace the example processing code in the process_item sub-routine with your code. Save as an application.
*)

(* TO FILTER FOR IMAGE FILES, LOOK FOR QUICKTIME SUPPORTED IMAGE FORMATS *)
property type_list : {"JPEG", "TIFF", "PNGf", "8BPS", "BMPf", "GIFf", "PDF ", "PICT"}
property extension_list : {"jpg", "jpeg", "tif", "tiff", "png", "psd", "bmp", "gif", "jp2", "pdf", "pict", "pct", "sgi", "tga"}
property typeIDs_list : {"public.jpeg", "public.tiff", "public.png", "com.adobe.photoshop-image", "com.microsoft.bmp", "com.compuserve.gif", "public.jpeg-2000", "com.adobe.pdf", "com.apple.pict", "com.sgi.sgi-image", "com.truevision.tga-image"}

-- This droplet processes files dropped onto the applet 
on open these_items
	-- FILTER THE DRAGGED-ON ITEMS BY CHECKING THEIR PROPERTIES AGAINST THE LISTS ABOVE
	repeat with i from 1 to the count of these_items
		set this_item to item i of these_items
		set the item_info to info for this_item without size
		if folder of the item_info is true then
			process_folder(this_item)
		else
			try
				set this_extension to the name extension of item_info
			on error
				set this_extension to ""
			end try
			try
				set this_filetype to the file type of item_info
			on error
				set this_filetype to ""
			end try
			try
				set this_typeID to the type identifier of item_info
			on error
				set this_typeID to ""
			end try
			if (folder of the item_info is false) and (alias of the item_info is false) and ((this_filetype is in the type_list) or (this_extension is in the extension_list) or (this_typeID is in typeIDs_list)) then
				-- THE ITEM IS AN IMAGE FILE AND CAN BE PROCESSED
				process_item(this_item)
			end if
		end if
	end repeat
end open

-- this sub-routine processes folders 
on process_folder(this_folder)
	set these_items to list folder this_folder without invisibles
	repeat with i from 1 to the count of these_items
		set this_item to alias ((this_folder as Unicode text) & (item i of these_items))
		set the item_info to info for this_item without size
		if folder of the item_info is true then
			process_folder(this_item)
		else
			try
				set this_extension to the name extension of item_info
			on error
				set this_extension to ""
			end try
			try
				set this_filetype to the file type of item_info
			on error
				set this_filetype to ""
			end try
			try
				set this_typeID to the type identifier of item_info
			on error
				set this_typeID to ""
			end try
			if (folder of the item_info is false) and (alias of the item_info is false) and ((this_filetype is in the type_list) or (this_extension is in the extension_list) or (this_typeID is in typeIDs_list)) then
				-- THE ITEM IS AN IMAGE FILE AND CAN BE PROCESSED
				process_item(this_item)
			end if
		end if
	end repeat
end process_folder

-- this sub-routine processes files 
on process_item(this_item)
	-- NOTE that the variable this_item is a file reference in alias format 
	-- PUT YOUR FILE PROCESSING STATEMENTS HERE 
	set padwidth to 10
	set this_file to POSIX path of this_item
	
	set newW to do shell script "sips -g pixelWidth  '" & this_file & "'  | awk '/pixelWidth:/{print $2}'"
	set newH to do shell script "sips -g pixelHeight  '" & this_file & "'  | awk '/pixelHeight:/{print $2}'"
	set newW to newW + (padwidth * 2)
	set newH to newH + (padwidth * 2)
	do shell script "sips -p " & newH & " " & newW & " --padColor 000000 '" & this_file & "'"
end process_item