Provided by: libvips-tools_7.26.3-1build1_amd64 bug


       vipsthumbnail - make thumbnails of image files


       vipsthumbnail [flags] imagefile1 imagefile2 ...


       vipsthumbnail(1)  processes  each  imagefile in turn, shrinking each image to fit within a
       128  by  128  pixel  square.   The  shrunk  image  is  written  to  a   new   file   named
       tn_imagefile.jpg.   This program is typically faster and uses less memory than other image
       thumbnail programs.

       For example:

        $ vipsthumbnail fred.png jim.tif

       will read image files fred.png and jim.tif and write thumbnails to the  files  tn_fred.jpg
       and tn_jim.jpg.

        $ vipsthumbnail --size=64 -o thumbnails/%s.png fred.jpg

       will  read  image  file  fred.jpg  and  write  a  64  x  64  pixel  thumbnail  to the file

       On Unix machines, vips  will  create  temporary  files  in  "/tmp"  by  default.  Use  the
       environment  variable  TMPDIR to change this location. On Windows, vips uses GetTempPath()
       to pick a location, see the MS documentation.

       Use the --vips-disc-threshold command-line switch, or  the  IM_DISC_THRESHOLD  environment
       variable, to make vipsthumbnail use memory rather than temporary files.


       -s N, --size=N
              Set  the output thumbnail size to N x N pixels. The image is shrunk so that it just
              fits within this area, Images which are smaller than this are expanded.

       -o FORMAT, --output=FORMAT
              Set the output format string. The input filename has any file type suffix  removed,
              then  that  value  is  substitued  into  FORMAT replacing %s.  The default value is
              tn_%s.jpg meaning JPEG output, with tn_ prepended. You can add format options  too,
              for example tn_%s.jpg:20 will write JPEG images with Q set to 20.

       -p I, --interpolator=I
              Resample  with  interpolator  I.   Use  vips  --list classes to see a list of valid
              interpolators. The default is bilinear.

       -n, --nosharpen
              By default, vipsthumbnail(1) will sharpen thumbnails slightly  to  make  them  look
              more pleasing. This option disables this sharpening.

       -e PROFILE, --eprofile=PROFILE
              Export  thumbnails  with  this  ICC  profile. Images are only colour-transformed if
              there is both an output and an input  profile  available.  The  input  profile  can
              either be embedded in the input image or supplied with the --iprofile option.

       -i PROFILE, --iprofile=PROFILE
              Import  images  with  this  ICC  profile,  if no profile is embdedded in the image.
              Images are only colour-transformed if there is both an output and an input  profile
              available. The output profile should be supplied with the --oprofile option.

       -l, --nodelete
              Don't  delete  the  profile  from  the  output  image. Since all output images will
              generally have the same profile, vipsthumbnail(1)  will  usually  delete  it.  This
              option leaves the profile inside the image.

       -v, --verbose
              vipsthumbnail(1)  normally  runs  silently,  except for warning and error messages.
              This option makes it print a list of the operations it performs on each image.


       returns 0 on success and non-zero on error.



                                           13 May 2010                           VIPSTHUMBNAIL(1)