[Insight-users] DicomSeriesReadImageWrite2_Problem to read dcmSeries

[Daniela Sacchetto]

Mathieu, a question for you: how can I know if Matlab png format is lossless or lossy?
 I don't have any information to help me and I found on wikipedia this definition:

"
Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression.

[...]

PNG uses a 2-stage compression process:

pre-compression: filtering (prediction)compression: DEFLATE
PNG uses a non-patented lossless data compression method known as DEFLATE, which is the same algorithm used in the zlib compression library.

"

But I don't find anything about PNG lossy compression.... 
Really, it is a simple curiosity because I could save my image in PGM or PPM how to told me...but, since I'm not expert in this field, I would know something about it.

Thanks for your time,
Regards
Daniela

> From: mathieu.malaterre at gmail.com
> Date: Tue, 25 May 2010 17:28:01 +0200
> Subject: Re: [Insight-users] DicomSeriesReadImageWrite2_Problem to read 	dcmSeries
> To: luis.ibanez at kitware.com
> CC: danysunflower at hotmail.it; insight-users at itk.org
> 
> On Tue, May 25, 2010 at 5:21 PM, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> > If keeping image precision is critical for your
> > application, you may want to save the images
> > in a lossless format (e.g. png) and still do the
> > same trick in ITK to read the series of slices.
> 
> Just for reference, PNG allow both lossless and lossy compression
> mechanism. You should pick the right one.
> 
> Otherwise go for the old timer: PGM/PPM :)
> 
> -- 
> Mathieu
 		 	   		  
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