Creating an image mask?

[Tizzy]

In my UI I have an image, loaded from a URL. It's a JPEG square. I want to create an image mask programmatically, so that the image is displayed in a circle.

I use:
imageView1.load_from_url(partnerPictureURL)

I then reference that image view from the UI.
As a sidenote I had trouble displaying the image in the view using the other methods so I went with this method.

Anyhow - any advice on doing this? Assuming the image is unique every time it's loaded.

[ccc]

See @0942v8653 's composite() function in http://omz-forums.appspot.com/pythonista/post/5035536628580352

[Tizzy]

Thank you. That looks like a great function. Before I saw this however, I clunked together code from a few different sources to get a dynamically generating, smoothly anti-aliased image mask.

The only problem I have now, and it's a problem which I haven't been able to get around irrespective of the image mask, is that I can't get anything to display inside of a UI imageview except using the load_from_url() method.

Here is the code I am using in a manner which seems right to me. It runs with no errors, but the imageview remains empty.

import ui
import cStringIO
import urllib2
from PIL import Image, ImageOps, ImageDraw
	

url= "http://vignette2.wikia.nocookie.net/jamesbond/images/3/31/Vesper_Lynd_(Eva_Green)_-_Profile.jpg/revision/latest?cb=20130506215331"	
	
v= ui.load_view('imageviewtest.pyui')
imageView1=v["imageview1"]
          

#load image from url and show it
file=cStringIO.StringIO(urllib2.urlopen(url).read())

img = Image.open(file)


#begin mask creation
bigsize = (img.size[0] * 3, img.size[1] * 3)
mask = Image.new('L', bigsize, 0)
draw = ImageDraw.Draw(mask) 
draw.ellipse((0, 0) + bigsize, fill=255)
mask = mask.resize(img.size, Image.ANTIALIAS)


img.putalpha(mask)

#show final masked image
img.show()

#change image to string form to be able to insert into a ui image view...hopefully
imgString = img.tostring()

imageView1.image = ui.Image.from_data(imgString)



v.present()

[ccc]

I believe that you get the result that you want with:

imageView1.image = pil2ui(img)

If you get @jmv38 's pil2ui() from http://omz-forums.appspot.com/pythonista/post/5520750224080896

[Tizzy]

Thank you CCC, that did the trick.

Here is an updated function that takes a url and shoots out a UI image.

import ui
import webbrowser
import cStringIO
import urllib2
from PIL import Image, ImageOps, ImageDraw
import io


url= "http://vignette2.wikia.nocookie.net/jamesbond/images/3/31/Vesper_Lynd_(Eva_Green)_-_Profile.jpg/revision/latest?cb=20130506215331"	

def circleMaskViewFromURL(url):
	url=url
	#load image from url and show it
	file=cStringIO.StringIO(urllib2.urlopen(url).read())

	img = Image.open(file)

	#begin mask creation
	bigsize = (img.size[0] * 3, img.size[1] * 3)
	mask = Image.new('L', bigsize, 0)
	draw = ImageDraw.Draw(mask) 
	draw.ellipse((0, 0) + bigsize, fill=255)
	mask = mask.resize(img.size, Image.ANTIALIAS)

	img.putalpha(mask)

	#show final masked image
	img.show()
	img=pil2ui(img)
	
	return img

# pil <=> ui
def pil2ui(imgIn):
    with io.BytesIO() as bIO:
        imgIn.save(bIO, 'PNG')
        imgOut = ui.Image.from_data(bIO.getvalue())
    del bIO
    return imgOut

imageView1.image=circleMaskViewFromURL(url)

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