Using vipsthumbnail: VIPS Reference Manual

## `vipsthumbnail` `vipsthumbnail` — Introduction to `vipsthumbnail`, with examples |

libvips ships with a handy command-line image thumbnailer, `vipsthumbnail`. This page introduces it, with some examples.

The thumbnailing functionality is implemented by ``vips_thumbnail()`` and ``vips_thumbnail_buffer()`` (which thumbnails an image held as a string), see the docs for details. You can use these functions from any language with a libvips binding. For example, from PHP you could write:

    $filename = "image.jpg";
    $image = Vips\Image::thumbnail($filename, 200, ["height" => 200]);
    $image->writeToFile("my-thumbnail.jpg");

## libvips options

`vipsthumbnail` supports the usual range of vips command-line options. A few of them are useful:

`--vips-cache-trace` shows each operation as libvips starts it. It can be handy to see exactly what operations `vipsthumbnail` is running for you.

`--vips-leak` turns on the libvips memory leak checker. As well as reporting leaks (hopefully there are none) it also tracks and reports peak memory use.

`--vips-progress` runs a progress indicator during computation. It can be useful to see where libvips is looping and how often.

`--vips-info` shows a higher level view of the operations that `vipsthumbnail` is running.