XnView Software

Export for WEB and printing on discs and fabrics. Make a menu for exporting files for the Internet, as well as for printing on disks (DVD / CD), in which you will be able to choose the method and number of indexed colors in the palette, as well as the ability to assign a color that will be transparent, saving further in PNG, GIF. And (and / or) a similar menu for saving in RGB with the transparency rendered in the alpha channel (JPEG-XR, TIFF, PNG, WebP, JPX, HEIC), with saving the file in (JPEG,PSD - transparency to layers) format and the possibility with the file to save the ICC profile.

so a user defined save setting menu item?

xnview wrote:so a user defined save setting menu item?

Sorry, did not quite understand the question.

Now there are no "setting" in the save settings menu: - save or not the alpha channel, convert colors from RGB to this or that palette of indexed colors, as well as select the color that will be set, as transparent. This is for those formats that support indexed colors.

I suggest adding these options, and then you can save files with transparency, both for use on the Internet, and for printing on the printer.

For an example of this menu, see the screenshot.