A work in progress - I want to make a rake task that will open a page in a new chrome window, then resize it to a specific size and take a screenshot. Should be awesome if it works.

gistfile1.applescript

tell application "/Applications/Google Chrome.app"
    make new window
    activate
end tell

gistfile2.txt

screencapture -c

http://www.maclife.com/article/columns/terminal_101_taking_screenshots_through_command_line

gistfile3.applescript

to splitString(aString, delimiter)
    set retVal to {}
    set prevDelimiter to AppleScript's text item delimiters
    set AppleScript's text item delimiters to {delimiter}
    set retVal to every text item of aString
    set AppleScript's text item delimiters to prevDelimiter
    return retVal
end splitString
on alfred_script(q)
    set newDimensions to splitString(q as text, "x")
    tell application "System Events"
        set frontApp to name of first application process whose frontmost is true
    end tell
    tell application "System Events" to tell application process frontApp
        tell window 1
            set size to {item 1 of newDimensions, item 2 of newDimensions}
        end tell
    end tell 
end alfred_script