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?