Question

I’m using PIL

    im = Image.open(teh_file)     if im:         colors = im.resize( (1,1), Image.ANTIALIAS).getpixel((0,0)) # simple way to get average color         red = colors[0] # and so on, some operations on color data 

The problem is, on a few (very few, particulary don’t know why those exactly, simple jpegs) I get ‘unsubscriptable object’ on line ‘colors[0]’. Tried:

if colors:  

gets true and goes on.

if len(colors): 

gives ‘len() of unsized object’

1. What condition should I apply not to get this exception?
2. What’s the cause of the problem?

Answer 1

From the PIL docs:

getpixel  im.getpixel(xy) => value or tuple  Returns the pixel at the given position. If the image is a multi-layer image, this method returns a tuple. 

So it seems that some of your images are multilayer, and some are single-layer.