It has been a while since I shared one of these!

Go here, for the basic tutorial and here, for black and white conversion.

Okay, here is how I convert an image to sepia using the GIMP.

Here is my before image.

I love it because it seems so moody.

Yes, I know that is a crazy number of tabs open.

I am really glad my version of GIMP has a single window mode or I would be in trouble!

Go to Colors/Colourize.

Change the settings in Colourize to:

Hue 30

Saturation 20(I often set it to 10 or less, I like a very subtle sepia)

Lightness 0(I usually leave lightness at 0 but you can play around with it)

If you want you can add some contrast by doing an overlay, see here on how to do one.

Go to File/Export to save your newly edited picture or hit Ctrl + Shift + E.

And that is it!

 It is so easy!

Before

After