[Insight-users] Fwd: changing size in KB in gipl image

[Luis Ibanez]

---------- Forwarded message ----------
From: Luis Ibanez <luis.ibanez at kitware.com>
Date: Sun, Jun 5, 2011 at 3:47 PM
Subject: Re: [Insight-users] changing size in KB in gipl image
To: john smith <mkitkinsightuser at gmail.com>


Ok, so you are doing the rescaling.
It shouldn't then be a surprise that
the z.gipl image is brighter.

You can compute the min and max of you image
with the MininumMaximumImageCalculator.
http://www.itk.org/Doxygen/html/classitk_1_1MinimumMaximumImageCalculator.html

The slice looks to me like 32 (notice that I'm
counting from zero. The first slice is the 0 slice).

    Luis

-----------------------------------
On Sun, Jun 5, 2011 at 3:42 PM, john smith <mkitkinsightuser at gmail.com> wrote:
> Yes, I am using RescaleIntensityImageFilte. How I could get the min and max
> value of my image? Are you sure that this corresponds to the 32 slice and
> not to the 33 as it seems from the itk-snap?
>
> 2011/6/5 Luis Ibanez <luis.ibanez at kitware.com>
>>
>> Hi John
>>
>> Tanks for sending the two images:
>>
>> A) The reason for the size difference is that one
>>     image contains 64 slices, while the other one
>>     only contains one slice.
>>
>>  17416 bytes in z.gipl
>> 1098496 bytes in MRIcrop-orig.gipl
>>
>> Image sizes =
>>
>> 78 x 110 x 1       z.gipl
>> 78 x 110 x 60     MRIcrop-orig.gipl
>>
>>
>>     The slice in the file: z.gipl, corresponds to
>>      slice 32 of the file: MRIcrop-orig.gipl
>>
>>
>> B) The slice in z.gipl was rescaled to fit the
>>     range of [0:255] in intensity values.
>>
>>     The equivalent slice 32 from the file
>>      MRIcrop-orig.gipl has 122 as the max
>>      value (that pixel was rescaled to 255)
>>      in the z.gipl image.
>>
>>
>> Are you using the RescaleIntensityImageFilter
>> anywhere in your pipeline ?
>>
>>
>>
>>   Thanks
>>
>>
>>        Luis
>>
>>
>> --------------------------------------------------------------
>> On Sun, Jun 5, 2011 at 3:24 PM, john smith <mkitkinsightuser at gmail.com>
>> wrote:
>> > OK, I have sent you the gipl files in a new email
>> >
>> > John
>> >
>> > 2011/6/5 Luis Ibanez <luis.ibanez at kitware.com>
>> >>
>> >> Hi John,
>> >>
>> >> Can you please email me the two images ?
>> >>
>> >>    Thanks
>> >>
>> >>
>> >>         Luis
>> >>
>> >> ---------------------------
>> >> On Sun, Jun 5, 2011 at 2:52 PM, john smith <mkitkinsightuser at gmail.com>
>> >> wrote:
>> >> > Well,
>> >> >
>> >> > I am trying to read a .gipl 3D image. Then by using the
>> >> > "itkExtractImageFilter.h" and "itkRescaleIntensityImageFilter.h", I
>> >> > extract
>> >> > a slice of this image and rescale the pixel values between [0,255]. I
>> >> > am
>> >> > using Qt to create my application and so far I firstly create a .png
>> >> > file of
>> >> > my slice image and then I display my png image in a Qpixmap.But when
>> >> > I
>> >> > use
>> >> > the itk-snap to display the same slice, I find difference between the
>> >> > two
>> >> > slices (itk-snap slice looks darker).I have tried to get my results
>> >> > in a
>> >> > gipl file with short format but still the problem remained the same.
>> >> > But
>> >> > I
>> >> > noticed that when I load the original image with itk-snap, in the
>> >> > image
>> >> > properties I get size in KB:1072, and when I load my created slice I
>> >> > get
>> >> > this property  size in KB:16. Do you know what is wrong and how to
>> >> > solve
>> >> > this problem?
>> >> >
>> >> > Thanks in advance
>> >> >
>> >> >
>> >> > 2011/6/5 Luis Ibanez <luis.ibanez at kitware.com>
>> >> >>
>> >> >> Hi John,
>> >> >>
>> >> >> Are you talking about the size of the image file in KiloBytes ?
>> >> >>
>> >> >> Is that what you mean by KB:16 ?
>> >> >>
>> >> >>
>> >> >>    Luis
>> >> >>
>> >> >>
>> >> >> --------------------------------
>> >> >> On Sun, Jun 5, 2011 at 5:47 AM, john smith
>> >> >> <mkitkinsightuser at gmail.com>
>> >> >> wrote:
>> >> >> > Hello,
>> >> >> >
>> >> >> > In my program I have created a gipl image with size in KB:16. How
>> >> >> > could
>> >> >> > I
>> >> >> > set this size to size in KB:1072?
>> >> >> >
>> >> >> > Thanks
>> >> >> >
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