mrwtoppm(1) Convert Minolta DiMAGE 5/7/7Hi/7i/A1 RAW images to PPM

SYNOPSIS

[-wb name | rgain : ggain : bgain ] [-cmapPath pathlist ] [-darkfield mrwfile ] [-darkfieldPath pathlist ] [-profilePath pathlist ] [-cprofile name ] [-scale scale ] [-imethod name ] [-vtol val ] [-Lab ] [-noLab ] [-vmf ] [-novmf ] [-mfilter ] [-nomfilter ] [-blur val ] [-isharp val ] [-csharp val ] [-rotate angle ] [-oprofile name ] [-contrast val ] [-gamma val ] [-tone name ] [-tcPath pathlist ] [-8 ] [-16 ] [-xvmini ] < infile > outfile

DESCRIPTION

converts a Minolta DiMAGE 5/7/7i/7Hi/A1 RAW image read from its standard input into a PPM image which is written to its standard output.

first processes the system wide parameter file (/usr/local/share/mrwtoppm/mrwtoppm.rc ) Entries in this file (if it exists) will override the compiled defaults.

then processes the user's parameter file ($HOME/.mrwtoppm/mrwtoppm.rc ) if it exists. Entries in this file will override both compiled defaults and entries in the system wide parameter file.

then processes command line options, which if given will override compiled values and values set in the initialization files. The program will then read a mrw file from its standard input, convert it as specified, and write a PPM file to its standard output.

PROCESSING AND OPTIONS

  1. The pixels input from the .mrw file are color corrected. The algorithm is to multiply the input pixels by gain values for each color. The default color balance is "camera", which uses the color balance data the camera stored in the mrw file.

    -wb name
    Overrides the default color balance. The following color balances are known to mrwtoppm: camera, daylight, flash, cloudy, tungsten, flourescent, none, and preset6. None does not balance the colors. The other color balances are camera specific and are obtained from data stored in the mrw file. Preset6 is a stored preset the meaning of which is currently unknown.
    -wb rgain : ggain : bgain
    Manually override color balance. Red, green and blue pixel values are multiplied by rgain /256, ggain /256 and bgain /256 respectively.
    -cmapPath pathlist
    By default, color balances other than those listed above are searched for in the following path list: .:colormaps:$HOME/.mrwtoppm/colormaps:/usr/local/share/mrwtoppm/colormaps This list can be changed using this option.

  2. The image is rotated by 0, 90, 180, or 270 degrees.

    -rotate angle
    Rotate image clockwise by angle degrees. The default is 0. The angle must be one of the above four values.

  3. The image can be optionally be scaled by an even factor (N). When the image is scaled bayer pattern interpolation is not performed and output pixels are calculated simply by averaging the same color pixels in N by N input blocks. If the scale does not evenly divide the image size (that is, for scales other than 1, 2, 4, and 8) the final image size is rounded down, and the excess input pixels are ignored. The selected pixels are centered on the image center. The intent is to allow high-speed image preview.

    -scale scale
    Divide image height and width each by scale Legal values are 1 (default, no scaling), 1/N for even N.

  4. A dark field image, if any, is subtracted from the image data. The dark field image must be an mrw file the same size as the image data. It should be an image taken with the same ISO and shutter speed as the image, but with the lens covered. The intent is subtract the CCD "noise" caused by long exposure times. Default is none.

    -darkfield name
    The dark field image is looked for in a file Qq Ar name Ns .mrw in the dark field path.
    -darfieldpath pathlist

  5. If the image is not scaled, the Bayer pattern data is interpolated. The following algorithms are implemented:

    • The vector median algorithm of Gupta and Chen (default).
    • A simple bilinear interpolation scheme (faster but much lower quality).

    -imethod name
    Select the interpolation method to use: bilinear, vmedian (default), mgbrb, mgmrb.
    -Lab
    Vector median interpolation and filtering is done in CIELab color space (default).
    -noLab
    Vector median interpolation and filtering is done in the camera's color space
    -vtol value
    Sets the error tolerance for the vector median algorithm (larger is faster, but lower quality). The default is fairly high quality.

  6. (Experimental) A median of medians filter may be applied.

    -mfilter
    Apply median of medians filter.
    -nomfilter
    Do not apply median of medians filter (default).

  7. The image's tone curve is adjusted.

    -tone name
    Apply the named tone curve. Default is "minolta". The tone curve "none" is just that.
    -tcpath pathlist
    Set the tone curve search path. The default tone curve search path is .:tonecurves:$HOME/.mrwtoppm/tonecurves:/usr/local/share/mrwtoppm/tonecurves

  8. An additional vector median filtering step may be performed.

    -vmf
    Apply additional vector median filter.
    -novmf
    Do not apply additional vector median filter (default)

  9. The image may be sharpened or blurred. In Lab mode, the luminance and chrominance channels can be sharpened/blurred independently. Sharpening is done by unsharp masking.

    -blur val
    Determine convolution matrix used for blurring This is a 3x3 matrix having the following values: 
    1     1/val   1
1/val 1/val^2 1/val
1     1/val   1
    The matrix is scaled so that the matrix elements sum to 1. Larger values cause more blurring. Default is 0.5.
    -isharpen val
    Sharpen pixels by val times the difference between the original and blurred values. Negative values blur the image. An amt of -1 replaces the pixel with the blurred pixel generated above. In Lab mode, only the L channel is affected. In RGB mode, all channels are affected. Default is 2.
    -csharpen val
    In Lab mode only, sharpen/blur the two chrominance channels by val Default is -1.

  10. The image is converted from the camera's color space into the output color space. The former defaults to the camera's color space, the latter to sRGB.

    -cprofile name
    Overrides the default camera profile.
    -oprofile name
    Overrides the default output profile.
    -profilePath pathlist
    Set the profile search path. The default tone curve search path is .:profiles:$HOME/.mrwtoppm/profiles:/usr/share/liblcms/profiles:/usr/share/mrwtoppm/profiles

  11. The image is further gamma corrected and contrast stretched.

    -gamma val
    Overrides the default gamma factor to correct for. The default gamma to correct for is 1 (meaning no change).
    -contrast val
    Override the default contrast setting. The image is contrast stretched so that the val /2000 largest color values and the val /2000 smallest color values are output as the maximum or minimum value respectively. The default is 1. If the contrast value is 0, the color values are only scaled such that the largest value is output as the maximum value. If the contrast value is negative, no contrast stretching is done.

  12. The image is output as a raw PPM file or as an xv thumbnail. The output file can contain either 8 or 16 bits per color per pixel.

    -8
    Output an 8 bit/color/pixel PPM file (default).
    -16
    Output a 16 bit/color/pixel PPM file.
    -xvmini
    Output an xv thumbnail file (8 bits total per pixel: 3 red, 3 green, 2 blue). Legal thumbnail files must be no larger than 80x80. The user is responsible for selecting a suitable scale factor for achieving this.

FILES

$HOME/.mwrtoppm/mrwtoppm.rc
The initialization file consist of a sequence of lines. Each line sets one option. Option names are the same as the command line options, except that the leading dash (Qq - ) is omitted. Options that take a parameter have the form option = value Options that do not have a parameter have the form option = (the need for the = is a bug that will get squished later).
/usr/share/mrwtoppm/colormaps/
Location of colormaps used for color balance correction.
/usr/share/mrwtoppm/profiles
Location of camera profiles used for color space conversion.
/usr/share/mrwtoppm/tonecurves/
Location of tone curves used for tone curve adjustment.

BUGS

Neither this program nor any others in the package take image files as parameters. They all read the image from the standard input and write their results (a PPM file in this case) to standard output. Unfortunately, this causes new users lots of grief.

AUTHOR

was written by An Bradley Broom Aq [email protected] .

This manual page was converted from 's manual by An Guus Sliepen Aq [email protected] for the Debian GNU/Linux system.

SEE ALSO

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