AppleScript-Droplet: convert image to monochrome / grayscale / black&white

Question

Level 1

30 points

AppleScript-Droplet: convert image to monochrome / grayscale / black&white

Hello,

i am used to applescript itself and now willing to write me a small droplet which converts dropped images (jpg & png) to grayscale images.

right now i am wondering which might be the best application i could use for that ?

First ideas was ImageMagick (somehow special ...macports) or Sips.

Is there any chance that i can use a more usual application like Preview from applescript to do the convert task ?

any ideas ?

Best regards
fidel

MacBookPro 15,4" 1,83 GHz; Mac Pro 2,66 Ghz; Macbook 2,0 GHz, Mac OS X (10.5.5)

Posted on Jun 14, 2009 9:01 AM

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Answer 1

fidel-castro Author

Level 1

30 points

Jun 14, 2009 10:36 AM in response to fidel-castro

ok ... converting to grayscale works with ImageMagick - but only for jpg's - not png's.

any ideas ?

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Answer 2

Arkouda

Level 4

3,377 points

Jun 14, 2009 3:39 PM in response to fidel-castro

Take a look at http://www.macosxautomation.com/applescript/imageevents/index.html

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Answer 3

Jun 14, 2009 3:48 PM in response to fidel-castro

Converting color images to grayscale is nowhere near as straightforward a process as most people seem to think it is, especially in the case of images built out of color table indices as 8-bit PNGs tend to be. Is your goal to produce attractive images or just colorless ones?

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Answer 4

Pierre L.

Level 5

4,641 points

Jun 14, 2009 4:12 PM in response to fidel-castro

The following droplet will use Preview to convert dropped images (both jpg & png) to grayscales images:

on open droppedImages
tell application "Preview"
activate
repeat with currentImage in droppedImages
open currentImage
tell application "System Events"
keystroke "c" using {option down, command down}
tell process "Preview"
set value of value indicator 1 of slider 2 of window 1 to 0
-- other image modifications are possible here
end tell
end tell
end repeat
tell application "System Events" to tell process "Preview" to click button 1 of window 1
end tell
end open

Just a starting point.

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Answer 5

fidel-castro Author

Level 1

30 points

Jun 15, 2009 2:23 AM in response to Pierre L.

Hi Piere,

that looks great - i added the applescript/keystroke part for save & quit and the result is perfect for my needs.

My mistake was to just check the offered options in automator - ignoring the keystroke possibilities.

Thanks once again

Best regards
fidel

code:
on open droppedImages
tell application "Preview"
activate
repeat with currentImage in droppedImages
open currentImage
tell application "System Events"
keystroke "c" using {option down, command down}
tell process "Preview"
set value of value indicator 1 of slider 2 of window 1 to 0
-- other image modifications are possible here
end tell
end tell
end repeat
tell application "System Events" to tell process "Preview" to click button 1 of window 1
-- save
tell application "System Events"
keystroke "s" using command down
end tell
-- quit preview
quit
end tell
end open

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