Changing .jpg image color

Scripting Forums AppleScript | Mac OS X
#1

Im a novice:
I have a .jpg file that is a solid color (rgb). I want to provide the applescript with a new rgb color and the file/path name and have applescript change the color. I looked at the app image events. But I could not see how it would work.

Any help would be appreciated.

Todd Dignan

Model: 10.8 and 10.9
AppleScript: 2.5.1
Browser: Safari 537.36
Operating System: Mac OS X (10.8)

#2

HI. I ‘m not aware of color assignment being within the scope of Image Events’ ability; you probably need a real image editor, such as Photoshop.

#3

Hi,

Here’s a AppleScriptObjC solution


on changeSolidColorOfImage(imagePath, {redValue, greenValue, blueValue, alphaValue})
	set filePath to POSIX path of imagePath
	set image to current application's NSImage's alloc()'s initWithContentsOfFile:filePath
	set imageSize to image's |size|()
	image's lockFocus()
	set newColor to current application's NSColor's colorWithRed:redValue green:greenValue blue:blueValue alpha:alphaValue
	newColor's setFill()
	current application's NSBezierPath's fillRect:(current application's NSMakeRect(0, 0, imageSize's width, imageSize's height))
	image's unlockFocus()
	set imageTIFFData to image's TIFFRepresentation()
	set imageRep to current application's NSBitmapImageRep's imageRepWithData:imageTIFFData
	set imageProperties to {NSImageCompressionFactor:1.0}
	set imageData to imageRep's representationUsingType:(current application's NSJPEGFileType) |properties|:imageProperties
	imageData's writeToFile:filePath atomically:false
end changeSolidColorOfImage

Copy the code in AppleScript Editor and save it as script bundle with name ChangeColor Library.scptd in ~/Library/Script Libraries/. If the folder Script Libraries does not exist, create it.

Open the Bundle Contents drawer in AppleScript Editor and check the checkbox AppleScript/Objective-C library.
Press again ⌘S

Call the handler with


set theLibrary to script "ChangeColor Library"
theLibrary's changeSolidColorOfImage((path to desktop as text) & "image.jpg", {1.0, 0.0, 1.0, 1.0})

the first handler parameter is the path to the image (HFS path or alias specifier)
the second handler parameter is a list of 4 values {redValue, greenValue, blueValue, alphaValue} all a real number between 0.0 and 1.0.

There is no error handling at all, so make sure that the parameters match the requirements

#4

you cannot run the library directly in AppleScript Editor