Unable to compress a RGB CT Image

[ravishankar]

Hi,

I am using dcmtk3.6.0, i am not able to compress a RGB CT Image with planar configuration = 1.
Return value of chooseRepresentation api is "Illegal parameter"

Original transfer syntax: Explicit VR Little Endian
Target Transfer syntax: JPEG Lossless, Nonhierarchical, First- Order Prediction(Processes 14 [Selection Value 1])

What could be the possible reasons?

thanks

[Michael Onken]

Hi,

what kind of SOP Class you have? The CT Image IOD (CT Image Storage SOP Class) does not allow RGB at all.

However, conversion probably works anyway.

So what is the output if you enable debug logging?

Best,
Michael

[ravishankar]

Hi,

The SOP Class is "Secondary Capture Image Storage".

After debugging i find out that , "togglePlanarConfiguration8"(djcodece.cc) api return "EC_IllegalParameter".
Their is a check in "togglePlanarConfiguration8":
(numValues%samplesPerPixel != 0)

This check failed for all RGB Images with Planar config=1,when trying to convert into JPEG Lossless.

Here is the link to one of the files.

https://drive.google.com/file/d/0Byiw_h ... sp=sharing

thanks

[Michael Onken]

Hi,

actually looks like a bug to me since the check does not consider any padding byte at the end of the pixel data. We'll fix that, I added the issue to the bug tracker.

Best,
Michael

[Jan Schlamelcher]

It has been fixed in this commit.