Hi,
Doing tests to compare compression settings after trying to compress an original CR image to below 500K size for document transfer.
1. The size output of built-in lossy compression( dicom.ini set LossyQuality = 50) does not result in any difference in file size from the default setting of LossyQuality = 95.
A. dicom.ini settings settings
DecompressNon16BitsJpeg = 1
UseBuiltInJPEG = 1
settings and the resulting file size
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uncompressed = 38.424 K
LossyQuality set at 95 = 7,462 k
LossyQuality set at 50 = 7,462 k
B. Using external program for compression (dcmcjpeg) dicom.ini settings
UseBuiltInJPEG = 0
using importconverter process with dcmcjpeg.exe -v +eb +g +q 50 parameters
settiings and the resulting file size
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set at 50 = 547 k
The test was does using a clean default server setup of 1.4.16i
C: I also obsserved that the image header of the compressed images do not indicate that a lossy compression was made sfter using jpeglossy of jpeg2000 lossy compression settings.
Header (0028,2110) CS [00] # 2 LossyImageCompression remains set to "0". I think k-pacs and iq-view uses this parameter because I get warnings when viewing images compressed from older conquest versions that were using dcmcjpeg.
saw this related post http://forum.dcmtk.org/viewtop…a9810bf07c18217d6e796f02c
I hope the observations can helps
ajgg