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vipsthumbnail

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 quite a bit faster and uses much 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. 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.

-d N, --disc=N

Set disc use threshold to N. Images which cannot be opened directly need to be decompressed first. Images which are smaller than N are decompressed to memory, images which are larger are decompressed to temporary files. Use the TMPDIR environment variable to change the location for temporary files.

-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.

RETURN VALUE

returns 0 on success and non-zero on error.

SEE ALSO

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