Alison Johnston

For some strange reason you’ve found yourself with a B&W image that you want to add some colour back into. Perhaps the bride holding the bouquet would look really nice if the roses were red and the stems were green but the rest of the image was left in B&W.

There are several ways that you can go about this in Photoshop but what we’re looking for is the most flexible, one that we can edit later without having to bin a couple of layers because the colours weren’t quite right.

You know the scene, spend a few precious hours doing the roses in the bouquet and then you find out that the darn things were pink, not red …... arghh! The question is, is there something within Photoshop that can help us ….. indeed there is.

Anyone who has restored some old photos will know all about hand colouring and basically, that is what we are going to do.

Open a B&W image, or just desat a colour one, or convert to grayscale (not that you would normally do that) but we’re just going to have a play and we don’t want any colour in the image, we don’t want it in RGB mode.

So what adjustment would give us the most flexibilty to change the colour if we chose too. You guessed didn’t you :-) We’re going to be working with a Hue/Saturation adjustment layer and we’re going to check the colorize box. At this point the whole image is going to be whatever colour you choose, that’s okay, we’re going to fix that. Choose a colour with the Hue slider – Adjust the Saturation slider and the Lightness slider until you are happy with the colour.

Now you’ve got this great big mess but we’re gonna fix it. Go down to the little mask icon at the bottom of the layers palette and click on it. You will now have a white box next to the hu/sat adjustment layer – and you’ll notice that you image still looks awful. So lets fix it. Click on the mask (white box) to make sure that it is active and press ctrl i on the keyboard (cmd i for the Mac) The mask should now have turned black, and the image should look exactly like it did when we first started. Grab your brush, and making sure that the f/ground colour is set to white (cos on a black mask, white reveals) and simply paint the area that you want the colour to show through. Change the layer blend mode to soft light, or if you don’t like that try overlay or one of the other blend modes. Don’t forget that you can also use the opacity slider to take down the intensity of the colour.

So yeah! how am I going to change the red roses to pink ? – double click on the hue/sat adjustment layer (not the layer mask), and the hue/sat dialogue box will appear. Change the hue/sat/lightness sliders till you get a whole other colour …. magic, you don’t have to trash layers and with them all you’re hard work.

You can do this as often as is needed to add various colours back into the image. Do a red adjustment layer for the roses and then a green one for the stems and leaves (example). Heck, do various shades of red and green if you want. It’s flexible and relatively simple to master.

Do gradients as well if you like and have that effect on a single rose and another gradient effect on a different rose. Make sure your f/ground and b/ground colours are set to what colours you want to use in your gradient. Click the little adjustment icon at the bottom of the layers palette and click gradient. From the dialogue box pick your f/ground b/ground gradient choose linear (or one of the other gradients available) click okay, add a layer mask, invert the layer mask, grab the brush tool, making sure that it is set to white – and paint in your gradient. This is limited to a certain degree but you can get some really nice effects going on and best of all it is editable.

Here are a couple of sample shots. I’m not a flower photographer, so this is about the only image with a flower in it, but it will give you an idea of what you can do.

Disclaimer – All spelling mistakes are deliberate :-)