> Originally, the image comes in with aa RLELossless transfer syntax
> (1.2.840.10008.1.2.5). After I run it through my archimed
> decompressor, the pixel data is 307200, which is the width X the
> height. The samples per pixel value is set to 3.

With YBR_FULL photometric interpretation, you need to have width x
height x 3 x (bits allocated) x (number of frames) bits in the
decompressed pixel data element. If not, something has gone wrong -
either the source image was incorrect or the RLE codec did not work
correctly.

YBR_FULL works very much like RGB, i.e. three samples per pixel, just
the color space is YCbCr instead of RGB. This is particularly useful
for doppler ultrasound where most of the image is grayscale (i.e. only
populates the Y components) and Cb and Cr are mostly zero, except for
the few patches of color on the image. On such images, RLE achieves
a compression ration that is much better than the compression ratio
on an equivalent RGB image.

Regards,
Marco Eichelberg
OFFIS

Thanks for replying, Marco:

Something is very wrong, then. Here are some tags before and after the
decompress. The decompressor works pretty much blind and in-place:

(0002,0010) UI [1.2.840.10008.1.2.5] # 20 1 TransferSyntaxUID
(0028,0002) US [3] # 2 1 SamplesPerPixel
(0028,0004) CS [YBR_FULL] # 8 1 PhotometricInterpretation
(0028,0006) US [1] # 2 1 PlanarConfiguration
(0028,0010) US [480] # 2 1 Rows
(0028,0011) US [640] # 2 1 Columns
(0028,0100) US [8] # 2 1 BitsAllocated
(0028,0101) US [8] # 2 1 BitsStored
(0028,0102) US [7] # 2 1 HighBit
(0028,0103) US [0] # 2 1 PixelRepresentation

(7fe0,0010) OB [00\00\00\00\00\00\...] # 151796 2 PixelData

after decompression:
(0002,0010) UI [1.2.840.10008.1.2.1] # 20 1 TransferSyntaxUID
(0028,0002) US [3] # 2 1 SamplesPerPixel
0028,0004) CS [YBR_FULL] # 8 1
PhotometricInterpretation
(0028,0006) US [1] # 2 1 PlanarConfiguration
(0028,0010) US [480] # 2 1 Rows
(0028,0011) US [640] # 2 1 Columns
(0028,0100) US [8] # 2 1 BitsAllocated
(0028,0101) US [8] # 2 1 BitsStored
(0028,0102) US [7] # 2 1 HighBit
(0028,0103) US [0] # 2 1 PixelRepresentation
(0028,2110) CS [00] # 2 1
LossyImageCompression
(7fe0,0010) OW [00\00\00....] # 307200 1 PixelData

-carlos