真正有用的是模板（菜单File）和代码片段（CTRL-Click into a script）。
模板Droplets->Recursive Image File Processing Droplet提供了一切。这是一个编辑后的版本，可以满足您的需求：
(*
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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"}
global outFile
-- This droplet processes files dropped onto the applet
on open these_items
set outFile to (choose file name with prompt "Output file:" default name "ResolutionReport.txt")
open for access outFile with write permission
-- 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
close access outFile
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
set H_res to 0
set V_res to 0
try
tell application "Image Events"
-- start the Image Events application
launch
-- open the image file
set this_image to open this_item
-- perform action
copy the resolution of this_image to {H_res, V_res}
set outString to ""
if H_res > 0 and V_res > 0 then
set outString to (H_res as string) & " dpi " & (POSIX path of this_item)
else
set outString to "#### ERROR #### " & (POSIX path of this_item)
end if
try
write outString & return to outFile
on error the error_message number the error_number
close access outFile
beep
tell me to activate
display dialog "Error: " & the error_number & ". " & the error_message buttons {"OK"} default button 1
end try
-- purge the open image data
close this_image
end tell
on error error_message number error_number
display alert "PROCESSING ERROR " & error_number message error_message as warning buttons {"Cancel"} cancel button "Cancel"
end try
end process_item