Convert file to specified format.

parameters

file extension: the extension of file corresponding to the format or $org to format to original file format
quality: the quality of file for type which handle it (jpeg, mpeg, png, mng, tiff, miff, bpg, webp…). It’s a positive integer, usually from 0 (or 1) to 100, the lowest means the lowest quality, the highest means highest quality.
density: resolution of file (Sets an attribute and does not alter the underlying raster image)
density units in dots per centimeter: specifies the density parameter is in dots per centimeter (default is dots per inch)
clipping path2021.6: name, or index (a number from 1 to n, preceeded with an octothorp (#)) of a clipping path to trim image, when converting from jpeg to png by example

Using this option destroys the clipping pathes and therefore prevents clipping in a chain.

outside or inside2021.6: to fill the outside or inside of the clipping path. Default is true (so outside)

JSON object properties

prefix e: target file extension
prefix q: quality
prefix d: density (the horizontal value or the vertical value, or the horizontal value and the vertical value separated by × or x, by exemple 72×72)
prefix hv: density horizontal value (if only hv is specified, vv is equals to hv)
prefix vv: density vertical value (if only vv is specified, hv is equals to vv)
switch dpi: set the density in dots per inch (default)
switch dpc: set the density in dots per centimeter
prefix cp: clipping path
switch outside: +outside for outside or -outside for inside

One value array with extension as target file extension, or only quality (integer), or both values.

The target file extension value.

{
     "format":"png"
}

Maldives: W400×H225

Simplified syntax: e_png,c_format

{
     "format": {
            "extension": "jpg",
            "quality": 5
     }
}

Simplified syntax: e_jpg,q_5,c_format

to change quality without changing extension, use $current value: e_$current,q_5,c_format