image resize doesn't work
in [Python]
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From: Peter Otten on 1 Aug 2010 17:32 Chris Hare wrote: > Thanks for the help. My one week of python is getting a workout. > > I have shortened it all down and made it a standalone example, using yours > as a model. Your example, works, but it will take a lot of effort to > retrofit it into the code I have. (which is maybe not a bad idea,). You mean retrofit something that works into something tha doesn't? Seriously, you should never be afraid to throw away code, especially while you're still in the early phase of learning the language. > def sizeit(filename): > image = Image.open(filename) Now you have an Image > w,h = image.size > print w, h > photo = ImageTk.PhotoImage(file=filename) and now a photo, both created from the same file but otherwise independent > canvasWidth = 450 > canvasHeight = 412 > image = image.resize((canvasWidth,canvasHeight),Image.ANTIALIAS) Now you have a new resized Image > w,h = image.size > print w, h > netRadarImage = Label(frame, image=image) Label(image=...) expects a PhotoImage > netRadarImage.image = photo > w.grid(row=1, column=0, columnspan=3) Hmm... > netRadarImage.grid( row=1, column=0) Here's the fixed code: def sizeit(filename): image = Image.open(filename) canvasWidth = 450 canvasHeight = 412 image = image.resize((canvasWidth, canvasHeight),Image.ANTIALIAS) photo = ImageTk.PhotoImage(image=image) netRadarImage = Label(frame, image=photo) netRadarImage.image = photo netRadarImage.grid(row=0, column=0) In plain English: - open the Image using the PIL - resize it - wrap it into a PhotoImage - wrap the PhotoImage into a Tkinter.Label either by passing it to the initialiser or by assigning to label["image"] - make sure the PhotoImage isn't garbage-collected e. g. by assigning to label.image Peter
From: Chris Hare on 1 Aug 2010 18:33 And I see now what I did wrong - thanks for putting up with the questions. On Aug 1, 2010, at 4:32 PM, Peter Otten wrote: > Chris Hare wrote: > >> Thanks for the help. My one week of python is getting a workout. >> >> I have shortened it all down and made it a standalone example, using yours >> as a model. Your example, works, but it will take a lot of effort to >> retrofit it into the code I have. (which is maybe not a bad idea,). > > You mean retrofit something that works into something tha doesn't? > Seriously, you should never be afraid to throw away code, especially while > you're still in the early phase of learning the language. > >> def sizeit(filename): >> image = Image.open(filename) > > Now you have an Image > >> w,h = image.size >> print w, h >> photo = ImageTk.PhotoImage(file=filename) > > and now a photo, both created from the same file but otherwise independent > >> canvasWidth = 450 >> canvasHeight = 412 >> image = image.resize((canvasWidth,canvasHeight),Image.ANTIALIAS) > > Now you have a new resized Image > >> w,h = image.size >> print w, h >> netRadarImage = Label(frame, image=image) > > Label(image=...) expects a PhotoImage > >> netRadarImage.image = photo >> w.grid(row=1, column=0, columnspan=3) > > Hmm... > >> netRadarImage.grid( row=1, column=0) > > Here's the fixed code: > > def sizeit(filename): > image = Image.open(filename) > canvasWidth = 450 > canvasHeight = 412 > image = image.resize((canvasWidth, canvasHeight),Image.ANTIALIAS) > photo = ImageTk.PhotoImage(image=image) > netRadarImage = Label(frame, image=photo) > netRadarImage.image = photo > netRadarImage.grid(row=0, column=0) > > In plain English: > > - open the Image using the PIL > - resize it > - wrap it into a PhotoImage > - wrap the PhotoImage into a Tkinter.Label either by passing it to the > initialiser or by assigning to label["image"] > - make sure the PhotoImage isn't garbage-collected e. g. by assigning to > label.image > > Peter > -- > http://mail.python.org/mailman/listinfo/python-list
From: Chris Hare on 1 Aug 2010 18:11 Thanks Peter - I know what I said sounded stupid :-) I have been working with Python for a week and as you know sometimes it is easier to learn by seeing what you did wrong as compared to what should have been done with the same example. I loved your code by the way - Thanks for help just another beginner .... On Aug 1, 2010, at 4:32 PM, Peter Otten wrote: > Chris Hare wrote: > >> Thanks for the help. My one week of python is getting a workout. >> >> I have shortened it all down and made it a standalone example, using yours >> as a model. Your example, works, but it will take a lot of effort to >> retrofit it into the code I have. (which is maybe not a bad idea,). > > You mean retrofit something that works into something tha doesn't? > Seriously, you should never be afraid to throw away code, especially while > you're still in the early phase of learning the language. > >> def sizeit(filename): >> image = Image.open(filename) > > Now you have an Image > >> w,h = image.size >> print w, h >> photo = ImageTk.PhotoImage(file=filename) > > and now a photo, both created from the same file but otherwise independent > >> canvasWidth = 450 >> canvasHeight = 412 >> image = image.resize((canvasWidth,canvasHeight),Image.ANTIALIAS) > > Now you have a new resized Image > >> w,h = image.size >> print w, h >> netRadarImage = Label(frame, image=image) > > Label(image=...) expects a PhotoImage > >> netRadarImage.image = photo >> w.grid(row=1, column=0, columnspan=3) > > Hmm... > >> netRadarImage.grid( row=1, column=0) > > Here's the fixed code: > > def sizeit(filename): > image = Image.open(filename) > canvasWidth = 450 > canvasHeight = 412 > image = image.resize((canvasWidth, canvasHeight),Image.ANTIALIAS) > photo = ImageTk.PhotoImage(image=image) > netRadarImage = Label(frame, image=photo) > netRadarImage.image = photo > netRadarImage.grid(row=0, column=0) > > In plain English: > > - open the Image using the PIL > - resize it > - wrap it into a PhotoImage > - wrap the PhotoImage into a Tkinter.Label either by passing it to the > initialiser or by assigning to label["image"] > - make sure the PhotoImage isn't garbage-collected e. g. by assigning to > label.image > > Peter > -- > http://mail.python.org/mailman/listinfo/python-list
From: Aahz on 12 Aug 2010 15:24
In article <mailman.1399.1280702057.1673.python-list(a)python.org>, Chris Hare <chare(a)labr.net> wrote: > >And I see now what I did wrong - thanks for putting up with the questions. Posting that information is useful for any other newbies who might be following along.... -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ "...if I were on life-support, I'd rather have it run by a Gameboy than a Windows box." --Cliff Wells |