VIPSTHUMBNAIL(1) User Commands VIPSTHUMBNAIL(1)

NAME

vipsthumbnail - make thumbnails of image files

SYNOPSIS

vipsthumbnail [flags] imagefile1 imagefile2 ...

DESCRIPTION

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 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.

Use "xN" or "Mx" to just resize on one axis.

Append "<" to only resize if the input image is smaller than
the target, append ">" to only resize if the input image is
larger than the target.


-o FORMAT, --output=FORMAT
Set the output format string. The input filename has any file
type suffix removed, then that value is substituted 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.


-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 embedded
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.


-c, --crop
Crop the output image down. The image is shrunk so as to
completely fill the bounding box in both axes, then any excess
is cropped off.


-d, --delete
Delete the output profile from the image. This can save a
small amount of space.


-t, --rotate
Auto-rotate images using EXIF orientation tags.


-a, --linear
Shrink images in linear light colour space. This can be much
slower.

RETURN VALUE

returns 0 on success and non-zero on error. Error can mean one or
more conversions failed.

SEE ALSO

vipsheader(1)

13 May 2010 VIPSTHUMBNAIL(1)