How can I save only one layer as a PNG file in Photoshop
I wanted save some layers as PNG files and I had opened a new window for every
.png file and pasted in there and sometimes crop it.
Is there a way to export just a few or one selected layer and not the whole file much more easily, or maybe only save the visible part as a PNG?
File > Scripts > Export Layers To Files
Visible Layers Only option if you want to export only those layers that have visibility enabled in the Layers panel.
If you use Photoshop CC you don't need any script.
You can activate the built-in function "Generator" (File > Generator). This function allow you to export layers and groups when you save the document. Simply rename your layers/group with the extension you need (like nav.png) and eventually the parameters.
With this method photoshop will export for you the named layers/group visible with associate layer style in the same directory of your file.