[Fwd: Re: [Insight-users] pixelType and grayscale]

[Romain Lebel]

Hi luis thanks for taking time to answer

I'm using the resampling filter not the rescaler. In my images (not 
medical) the intensity aren't close to 1.

if i put unsigned char in the output image type of the resampling filter 
the result is the same

is there any filter that forces  an image to be a 8 bits image?
Should i try the caster filter with unsigned int as output pixel type?

Luis Ibanez a écrit :

>
> Hi Romain,
>
> You don't need a caster at the output of a rescale intensity filter.
>
> Simply declare the rescale intensity filter to have the pixel type
> that you want on the output image.
>
> It is likely that your images have pixel values close to 1 and
> look to dark when viewed in the dynamic range of 0-255.
>
> You may want to use the ImageViewer that is available in
>
>
>     InsightApplications/ImageViewer
>
> This simple viewer will take into account pixel spacing and will
> normalize the dynamic range of the image for display.
>
>
> BTW:
> You should avoid using BMP as a format for medical images.
>
>
>
>   Regards,
>
>
>      Luis
>
>
> --------------------
> Romain Lebel wrote:
>
>>
>>    
>>    
>>    
>>    
>>    
>>    
>>    
>> I save Them as bmp
>>
>> when i visualize them they are in greyscale but in the file format 
>> they are in rgb not in 8 bits
>> i vizualize them with windows or image J
>>
>> i use the cast filter on a resample filter output
>> the input of the writer is the caster ouput
>>
>>
>>
>> Luis Ibanez a écrit :
>>
>>>
>>> Hi Romain,
>>>
>>>
>>> Using unsigned char for pixel type should be enough.
>>>
>>>
>>> * What are you using for visualizing your images ?
>>>
>>> * What file format are you using ?
>>>
>>> * What do you observe in your images after saving them ?
>>>      are they black ?
>>>      are they binary ?
>>>      are they noisy ?
>>>
>>>
>>>
>>> Please provide more information.
>>>
>>>
>>>    Thanks
>>>
>>>
>>>      Luis
>>>
>>>
>>>
>>> -------------------
>>> Romain Lebel wrote:
>>>
>>>> Hi every one!
>>>>
>>>> I can't get my images to be grascale when i save them
>>>> I'm using unsigned char as pixel type
>>>> What else should i do to get 8bits grayscale image saved ?
>>>>
>>>
>>>
>>>
>>
>>
>
>
>


-- 
Romain Lebel
PhaseView - Telecom Paris
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