[Dcmlib] PixelPaddingValue

[Jean-Pierre Roux]

Aris Basic wrote:

[...]

> btw when newer gdcm give out message that pixeldata has to bin 
> downshift what actualy happens ?

--> could you tell us what's the exact message ?

We separate the 'header' analysis and the actual pixel reading.
We assumed that, in some cases, the user wants to choose the images he 
wants to work with, just 'looking' at the header.
Therefore, we don't load 'long'values (>4096 bytes), to save time and 
RAM space, and we display (at Print time) a message like :

[Pixel Data] [gdcm::NotLoaded Ad.:394226 x(603f2) Lgt:1047272 x(ffae8)]

(But I think you're talking about something else)

> (was looking at gdcm code but i all i've seen is the printing of the 
> Warn message).


> (i noticed that with JPEG Lossless compresed 12bit images (packed in 
> 16) i personaly have to multiply each pixel value with 256 (16*16)
> and for LEI images its enoigh to multiply it by 16 (in order to adjust 
> its 12bit range value in 16bit space)
> (at least that gives me results (on display) comparable to other dicom 
> viewer [efilm,...] ))

It sounds like a bug in gdcm ...
Could you send me an image with JPEG Lossless compresed 12bit images 
(packed in 16), to fix the bug.
Thx
Jean-Pierre.

>
> Aris
>