Re: What happend to Image?
- To: mathgroup at smc.vnet.net
- Subject: [mg130756] Re: What happend to Image?
- From: Bob Hanlon <hanlonr357 at gmail.com>
- Date: Fri, 10 May 2013 00:31:26 -0400 (EDT)
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"As of Mathematica 9, Image objects are atomic."
Then someone at Wolfram needs to update the documentation since it states
for Image:
"New in 7 | Last modified in 8"
Bob Hanlon
On Thu, May 9, 2013 at 2:45 AM, Matthias Odisio <matthias at wolfram.com>wrote:
> Dear Alexei Boulbitch,
>
> On 5/8/13 3:09 AM, Alexei Boulbitch wrote:
> > Dear Community,
> >
> > I just noticed that the function Image[ ] has unexpectedly changed
> since 9.0.0.
> >
> > Some time ago I have written a handy program working with the image. I
> have once published it here. Among others this program applied the operation
> >
> > ReplacePart[image,{4,2}?size]
> >
> > Where image was the image in use and size has been a parameter equal to
> a desired ImageSize option. This worked previously. Now it does not.
> >
> > I checked that the Image indeed has changed somehow.
> >
> > Let us load any image. For example, this:
> >
> > lena = Import["ExampleData/lena.tif"]
> >
> > One may check that this is indeed an image:
> >
> > Head[lena]
> >
> > Image
> >
> > Let us do like this:
> >
> > lena2= Image[lena, ImageSize -> 300]
> >
> > then the {{4,2}} part should memorize its size.
> >
> > One may look at its TreeForm (evaluate this and make sure that it has
> levels 0, 1, and 2), and {{4,2}} is indeed 300
> >
> > TreeForm[lena2]
> >
> > However, if one would evaluate this
> >
> > Lena2[[4,2]]
> >
> > he get the message
> > Part::partd: Part specification... is longer than depth of object\""
> >
> > Not only {{4,2}}, but also other leaves of the tree are not acceccible.
> >
> > What happened to the Image?
> >
> > Alexei
> >
> >
> > Alexei BOULBITCH, Dr., habil.
> > IEE S.A.
> > ZAE Weiergewan,
> > 11, rue Edmond Reuter,
> > L-5326 Contern, LUXEMBOURG
> >
> > Office phone : +352-2454-2566
> > Office fax: +352-2454-3566
> > mobile phone: +49 151 52 40 66 44
> >
> > e-mail: alexei.boulbitch at iee.lu
> >
>
> As of Mathematica 9, Image objects are atomic.
> Wolfram Research has a strong commitment to and a track record of
> preserving legacy across versions. Before Mathematica 9, it was never
> documented, advised, or advertised to access or replace parts of an
> Image object. All these operations should be performed using
> documented functions like Image, ImageData, ImageQ, etc.
> Image objects are atomic so it is easier for Wolfram Research to
> expand the scope of image processing features while maintaining an
> internal representation which is as efficient as possible.
>
>
> As you found out, one can change the displayed size of an image using
> Image:
>
> lena = Import["ExampleData/lena.tif"];
> newimg = Image[lena, ImageSize -> newsize]
> Options[#, ImageSize] & /@ {lena, newimg}
>
>
>
> Matthias Odisio
> Wolfram Research
>
>
- References:
- What happend to Image?
- From: Alexei Boulbitch <Alexei.Boulbitch@iee.lu>
- What happend to Image?