-h --help print this help text and exit

--version print version information and exit

-v --verbose verbose mode, print processing details

-d --debug debug mode, print debug information

input file format:

+f --read-file read file format or data set (default)

+fo --read-file-only read file format only

-f --read-dataset read data set without file meta information

input transfer syntax:

-t= --read-xfer-auto use TS recognition (default)

-td --read-xfer-detect ignore TS specified in the file meta header

-te --read-xfer-little read with explicit VR little endian TS

-tb --read-xfer-big read with explicit VR big endian TS

-ti --read-xfer-implicit read with implicit VR little endian TS

compatibility options (ignored by +tl):

+Ma --accept-acr-nema accept ACR-NEMA images without photometric interpretation

# Enables compatibility for old ACR-NEMA images without photometric # information (only pseudo lossless encoder)

+Mp --accept-palettes accept incorrect palette attribute tags (0028,111x) and (0028,121x)

# If enabled, incorrect palette attribute tags are accepted # (only pseudo lossless encoder)

JPEG process options:

+e1 --encode-lossless-sv1 encode lossless sv1 (default)

# This option selects the JPEG Lossless, Non-Hierarchical, First-Order # Prediction (Process 14 Selection Value 1) Transfer Syntax for # Lossless JPEG Image Compression.

+el --encode-lossless encode lossless

# This option selects the JPEG Lossless, Non-Hierarchical (Process 14) # Transfer Syntax for Lossless JPEG Image Compression.

+eb --encode-baseline encode baseline

# This option selects the JPEG Baseline (Process 1) Transfer Syntax for # Lossy JPEG 8 Bit Image Compression.

+ee --encode-extended encode extended sequential

# This option selects the JPEG Extended (Process 2 & 4) Transfer Syntax # for Lossy JPEG Image Compression.

+es --encode-spectral encode spectral selection

# This option selects the JPEG Spectral Selection, Non-Hierarchical # (Process 6 & 8) Transfer Syntax for Lossy JPEG Image Compression.

+ep --encode-progressive encode progressive

# This option selects the JPEG Full Progression, Non-Hierarchical # (Process 10 & 12) Transfer Syntax for Lossy JPEG Image Compression.

lossless JPEG codec selection:

+tl --true-lossless true lossless codec (default)

# This option selects an encoder, that guarantees truely lossless # image compression. See NOTES for further information.

+pl --pseudo-lossless old pseudo-lossless codec

# Old encoder, that uses lossless compression algorithms, but can # cause lossy images because of internal color space transformations # etc. Higher compression ratio than --true-lossless in most cases.

lossless JPEG representation options:

+sv --selection-value [sv]: integer (1..7, default: 6) use selection value sv only with --encode-lossless

# This option selects the selection value for lossless JPEG.

+pt --point-transform [pt]: integer (0..15, default: 0) use point transform pt

# This option selects the point transform for lossless JPEG. # WARNING: Using this option with a value other than zero causes # a loss of precision, i. e. makes the compression "lossy".

lossy JPEG representation options:

+q --quality [q]: integer (0..100, default: 90) use quality factor q

# This option selects the quality factor used to determine the # quantization table inside the JPEG compressor, which affects # compression ratio and image quality in lossy JPEG. See documentation # of the Independent JPEG Group for details.

+sm --smooth [s]: integer (0..100, default: 0) use smoothing factor s

# This option enables a smoothing (low-pass filter) of the image data # prior to compression. Increases the compression ratio at the expense # of image quality.

other JPEG options:

+ho --huffman-optimize optimize huffman tables (default)

# This option enables an optimization of the huffman tables during # image compression. It results in a slightly smaller image at a small # increase of CPU time. Always on if bits/sample is larger than 8.

-ho --huffman-standard use standard huffman tables if 8 bits/sample

# This option disables an optimization of the huffman tables during # image compression.

compressed bits per sample options (always +ba with +tl):

+ba --bits-auto choose bits/sample automatically (default)

+be --bits-force-8 force 8 bits/sample

+bt --bits-force-12 force 12 bits/sample (not with baseline)

+bs --bits-force-16 force 16 bits/sample (lossless only)

compression color space conversion options (overriden by +tl):

+cy --color-ybr use YCbCr for color images if lossy (default)

# This option enables a transformation of the color space to YCbCr # prior to image compression for color images in lossy JPEG.

+cr --color-rgb use RGB for color images if lossy

# This option prevents the transformation of the color space to YCbCr # prior to image compression for color images in lossy JPEG. It causes # lossy image compression in the RGB color space which is not # recommendable.

+cm --monochrome convert color images to monochrome

# This option forces a conversion of color images to monochrome # prior to compression.

decompr. color space conversion (if input is compressed; always +cn with +tl):

+cp --conv-photometric convert if YCbCr photom. interpr. (default)

# This option describes the behavior of dcmcjpeg when a compressed # image is read and decompressed prior to re-compression. If the # compressed image uses YBR_FULL or YBR_FULL_422 photometric # interpretation, it is converted to RGB during decompression.

+cl --conv-lossy convert YCbCr to RGB if lossy JPEG

# If the compressed image is encoded in lossy JPEG, assume YCbCr # color model and convert to RGB.

+ca --conv-always always convert YCbCr to RGB

# If the compressed image is a color image, assume YCbCr color model # and convert to RGB.

+cn --conv-never never convert color space

# Never convert color space during decompression.

standard YCbCr component subsampling options (not with +tl):

+s4 --sample-444 4:4:4 sampling with YBR_FULL (default)

# This option disables color component subsampling for compression in # the YCbCr color space. The DICOM photometric interpretation is # encoded as YBR_FULL.

+s2 --sample-422 4:2:2 subsampling with YBR_FULL_422

# This option enables a 4:2:2 color component subsampling for # compression in the YCbCr color space. The DICOM photometric # interpretation is encoded as YBR_FULL.

non-standard YCbCr component subsampling options (not with +tl):

+n2 --nonstd-422-full 4:2:2 subsampling with YBR_FULL

# This option enables a 4:2:2 color component subsampling for # compression in the YCbCr color space. The DICOM photometric # interpretation is encoded as YBR_FULL which violates DICOM rules.

+n1 --nonstd-411-full 4:1:1 subsampling with YBR_FULL

# This option enables a 4:1:1 color component subsampling for # compression in the YCbCr color space. The DICOM photometric # interpretation is encoded as YBR_FULL which violates DICOM rules.

+np --nonstd-411 4:1:1 subsampling with YBR_FULL_422

# This option enables a 4:1:1 color component subsampling for # compression in the YCbCr color space. The DICOM photometric # interpretation is encoded as YBR_FULL_422 which violates DICOM rules.

+ff --fragment-per-frame encode each frame as one fragment (default)

# This option causes the creation of one compressed fragment for each # frame (recommended).

+fs --fragment-size [s]ize: integer limit fragment size to s kbytes

# This option limits the fragment size which may cause the creation of # multiple fragments per frame.

basic offset table encoding options:

+ot --offset-table-create create offset table (default)

# This option causes the creation of a valid offset table for the # compressed JPEG fragments.

-ot --offset-table-empty leave offset table empty

# This option causes the creation of an empty offset table # for the compressed JPEG fragments.

VOI windowing options for monochrome images (not with +tl):

-W --no-windowing no VOI windowing (default)

# No window level/width is "burned" into monochrome images prior to # compression. See notes below on pixel scaling and rescale slope # and intercept encoding.

+Wi --use-window [n]umber : integer use the n-th VOI window from image file

# Apply the n-th window center/width encoded in the image data prior # to compression.

+Wl --use-voi-lut [n]umber : integer use the n-th VOI look up table from image file

# Apply the n-th VOI LUT encoded in the image data prior # to compression.

+Wm --min-max-window compute VOI window using min-max algorithm

# Compute and apply a window center and width that covers the # range from the smallest to the largest occuring pixel value.

+Wn --min-max-window-n compute VOI window using min-max algorithm, ignoring extreme values

# Compute and apply a window center and width that covers the # range from the second smallest to the second largest occuring # pixel value. This is useful if the background is set to an # artificial black (padding value) or if white overlays are burned # into the image data which should not be considered for the window # computation.

+Wr --roi-min-max-window [l]eft [t]op [w]idth [h]eight : integer compute ROI window using min-max algorithm, region of interest is specified by l,t,w,h

# This option works like --min-max-window but only considers the given # region of interest inside the image.

+Wh --histogram-window [n]umber: integer compute VOI window using Histogram algorithm, ignoring n percent

# Compute a histogram of the image data and apply window center # and width such than n% of the image data are ignored for the window # computation

+Ww --set-window [c]enter [w]idth : float compute VOI window using center c and width w

# Apply the given window center/width prior to compression.

pixel scaling for monochrome images (--no-windowing; ignored by +tl):

+sp --scaling-pixel scale using min/max pixel value (default)

# Monochrome image pixel values are always scaled to make use of the # pixel range available with the selected JPEG process as good as # possible. This option selects a scaling based on the minimum and # maximum pixel value occuring in the image. This often leads to # significantly better image quality, but may cause different # compressed images within one series to have different values for # rescale slope and intercept, which is a problem if a presentation # state for one series is to be created.

+sr --scaling-range scale using min/max range

# This options selects a scaling based on the pixel range as defined # by the stored bits, pixel representation and modality transform, # without consideration of the minimum and maximum value really # used within the image.

rescale slope/intercept encoding for monochrome (-W; ignored by +tl):

+ri --rescale-identity encode identity modality rescale (default) Never used for CT images

# This options prevents the creation of a modality transformation # other than an identity transformation (which is required for # many DICOM IODs). Window center/width settings encoded # in the image are adapted, VOI LUTs are removed.

+rm --rescale-map use modality rescale to scale pixel range Never used for XA/RF/XA Biplane images

# This option causes the creation of a modality rescale slope and # intercept that maps the decompressed image data back to their # original range. This keeps all VOI transformations valid but # requires that the DICOM IOD supports a modality rescale slope # and intercept transformation other than identity.

SOP Class UID options:

+cd --class-default keep SOP Class UID (default)

# Keep the SOP Class UID of the source image.

+cs --class-sc convert to Secondary Capture Image (implies --uid-always)

# Convert the image to Secondary Capture. In addition to the SOP Class # UID, all attributes required for a valid secondary capture image are # added. A new SOP instance UID is always assigned.

SOP Instance UID options: +ud --uid-default assign new UID if lossy compression (default)

# Assigns a new SOP instance UID if the compression is lossy JPEG.

+ua --uid-always always assign new UID

# Unconditionally assigns a new SOP instance UID.

+un --uid-never never assign new UID

# Never assigns a new SOP instance UID.

post-1993 value representations:

+u --enable-new-vr enable support for new VRs (UN/UT) (default)

-u --disable-new-vr disable support for new VRs, convert to OB

group length encoding:

+g= --group-length-recalc recalculate group lengths if present (default)

+g --group-length-create always write with group length elements

-g --group-length-remove always write without group length elements

length encoding in sequences and items:

+e --length-explicit write with explicit lengths (default)

-e --length-undefined write with undefined lengths

data set trailing padding:

-p= --padding-retain do not change padding (default)

-p --padding-off no padding

+p --padding-create [f]ile-pad [i]tem-pad: integer align file on multiple of f bytes and items on multiple of i bytes