VIPSTHUMBNAIL(1)VIPSTHUMBNAIL(1)NAMEvipsthumbnail - make thumbnails of image files
SYNOPSISvipsthumbnail [flags] imagefile1 imagefile2 ...
DESCRIPTIONvipsthumbnail(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 -f thumbnails/%s.png fred.jpg
will read image file fred.jpg and write a 64 x 64 pixel thumbnail to
the file thumbnails/fred.png.
OPTIONS-s N, --size=N
Set the output thumbnail size to N x N pixels. You can use MxN
to specify a rectangular bounding box. The image is shrunk so
that it just fits within this area, images which are smaller
than this are expanded.
-f FORMAT, --format=FORMAT
Set the output format string. The input filename has any file
type suffix removed, then that value is substitued into FORMAT
replacing %s. If FORMAT is a relative path, the name of the
input directory is prepended. In other words, any path in FORMAT
is relative to the directory of the current input file.
The default value is tn_%s.jpg meaning JPEG output, with tn_
prepended. You can add format options too, for example
tn_%s.jpg[Q=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.
-r, --sharpen=none|mild|MASKFILE
Images can look a little soft after shrinking. This option lets
you specify a sharpening mask. Use "none" to disable sharpening,
or "mild" to sharpen lightly, or give the filename of a custom
mask file to use. The default is "mild". The built-in mild
sharpen mask is:
3 3 24 0
-1 -1 -1
-1 32 -1
-1 -1 -1
-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 pro‐
file should be supplied with the --oprofile option.
-c, --crop
Crop the output image down. The image is shrunk so as to com‐
pletely fill the bounding box in both axies, then any excess is
cropped off.
-d, --delete
Delete the output profile from the image. This can save a small
amount of space.
-v, --verbose
vipsthumbnail(1) normally runs silently, except for warning and
error messages. This option makes it print a list of the opera‐
tions it performs on each image.
RETURN VALUE
returns 0 on success and non-zero on error. Error can mean one or more
conversions failed.
SEE ALSOvipsheader(1)
13 May 2010 VIPSTHUMBNAIL(1)
