I know I can very easily export an image to PNG 8bit with just a single color channel in Gimp. But I can't figure out how to do that in Photoshop. "Export as" gives an option to reduce number of bits per channel but not to reduce number of channels,even in gray-scale mode.Can Photoshop do that without any external plugins?And if not,is there a free/commercial plugin that can do that?
- Make sure your image is in Grayscale mode.
- Choose File > Save As.
- Select png format and save the file.