NAME

       thumbnail - create a TIFF file with thumbnail images

SYNOPSIS

       thumbnail [ options ] input.tif output.tif

DESCRIPTION

       thumbnail is a program written to show how one might use the SubIFD tag (#330) to store thumbnail images.
       thumbnail  copies  a TIFF Class F facsimile file to the output file and for each image an 8-bit greyscale
       "thumbnail sketch" is created.  The  output  file  contains  the  thumbnail  image  with  the  associated
       full-resolution page linked below with the SubIFD tag.

       By  default,  thumbnail images are 216 pixels wide by 274 pixels high.  Pixels are calculated by sampling
       and filtering the input image with each pixel value passed through a contrast curve.

OPTIONS

       -w width
              Specify the width of thumbnail images in pixels.

       -h height
              Specify the height of thumbnail images in pixels.

       -c contrast
              Specify a contrast curve to apply in generating the thumbnail images.  By  default  pixels  values
              are  passed  through a linear contrast curve that simply maps the pixel value ranges.  Alternative
              curves are:
                                             ┌────────┬────────────────────────┐
                                             │ Curve  │ Description            │
                                             ├────────┼────────────────────────┤
                                             │ exp50  │ 50% exponential curve  │
                                             ├────────┼────────────────────────┤
                                             │ exp60  │ 60% exponential curve  │
                                             ├────────┼────────────────────────┤
                                             │ exp70  │ 70% exponential curve  │
                                             ├────────┼────────────────────────┤
                                             │ exp80  │ 80% exponential curve  │
                                             ├────────┼────────────────────────┤
                                             │ exp90  │ 90% exponential curve  │
                                             ├────────┼────────────────────────┤
                                             │ exp    │ pure exponential curve │
                                             ├────────┼────────────────────────┤
                                             │ linear │ linear curve           │
                                             └────────┴────────────────────────┘

BUGS

       There are no options to control the format of the saved thumbnail images.

SEE ALSO

       tiffdump (1), tiffgt (1), tiffinfo (1), libtiff (3tiff),

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2024, LibTIFF contributors

4.5                                               Sep 05, 2024                                      THUMBNAIL(1)