Detect Duplicate Images and alias them?

[jestarray]

TexturePacker https://www.codeandweb.com/texturepacker
has an option to first trim and then detect identical sprites and then only duplicate/alias them in a resulting data file.json which can save a lot of space.

{"frames": [
{
	"filename": "1 - Copy.png",
	"frame": {"x":377,"y":83,"w":48,"h":64},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":48,"h":64},
	"sourceSize": {"w":48,"h":64}
},
{
	"filename": "1.png",
	"frame": {"x":377,"y":83,"w":48,"h":64},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":48,"h":64},
	"sourceSize": {"w":48,"h":64}
},
{
	"filename": "2.png",
	"frame": {"x":1,"y":163,"w":128,"h":64},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":128,"h":64},
	"sourceSize": {"w":128,"h":64}
},
{
	"filename": "3.png",
	"frame": {"x":275,"y":83,"w":100,"h":39},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":100,"h":39},
	"sourceSize": {"w":100,"h":39}
},
{
	"filename": "4.png",
	"frame": {"x":131,"y":165,"w":45,"h":159},
	"rotated": true,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":45,"h":159},
	"sourceSize": {"w":45,"h":159}
},
{
	"filename": "5.png",
	"frame": {"x":292,"y":124,"w":82,"h":82},
	"rotated": false,
	"trimmed": true,
	"spriteSourceSize": {"x":9,"y":9,"w":82,"h":82},
	"sourceSize": {"w":100,"h":100}
},
{
	"filename": "6.png",
	"frame": {"x":133,"y":1,"w":160,"h":80},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":160,"h":80},
	"sourceSize": {"w":160,"h":80}
},
{
	"filename": "7.png",
	"frame": {"x":295,"y":1,"w":80,"h":130},
	"rotated": true,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":80,"h":130},
	"sourceSize": {"w":80,"h":130}
},
{
	"filename": "8.png",
	"frame": {"x":1,"y":1,"w":130,"h":160},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":130,"h":160},
	"sourceSize": {"w":130,"h":160}
},
{
	"filename": "9.png",
	"frame": {"x":133,"y":83,"w":80,"h":140},
	"rotated": true,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":80,"h":140},
	"sourceSize": {"w":80,"h":140}
},
{
	"filename": "10.png",
	"frame": {"x":292,"y":208,"w":80,"h":16},
	"rotated": false,
	"trimmed": false,
	"spriteSourceSize": {"x":0,"y":0,"w":80,"h":16},
	"sourceSize": {"w":80,"h":16}
}]}

here are the resulting files: