Lighten or Darken Specific Areas
The curves window can help you lighten and darken higlights, shadows, and midtones in your image. If you want to make image corrections that apply to all the highlights, shadows, or midtones of your image, then read the 'curves' tutorial to learn more. This tutorial will outline how you can lighten or darken specific areas of your image.
Using Blending Modes and Layer Masks.
Open your image in Acorn, File ▸ Open. Start by adjusting the levels of your image, Filter ▸ Color Adjustment ▸ Levels. Bring the sliders just below the histogram inwards until they are just underneath where the curve starts to develop. You can use Auto Levels as well, but for the purposes of learning, try adjusting them yourself.
Duplicate your original layer twice, Layer ▸ Duplicate Layer (⇧⌘D). On one of the duplicated layers, change the blending mode to 'Color Dodge'. Rename this layer 'dodge'. On the other duplicated layer, change the blending mode to 'Color Burn'. Rename this layer 'burn'.
Add a layer mask to the Dodge layer by clicking on the cogwheel towards the bottom left of the inspector palette and selecting 'Add Layer Mask'. Then go to Filter ▸ Color Effect ▸ Color Invert. Click 'Flatten' in the layer filter window. Repeat those steps on the Burn layer.
The dodge layer mask is where you can lighten areas of the image, and the burn layer mask is where you can darken areas of the image. Choose the paint tool and select a thick brush. Set the color of the brush to white or light gray.
The yellow petals have been darkened by brushing in the Burn layer and the opacity of the layer has been decreased.
To lighten areas, switch to the Dodge layer. The stems of the flowers have been lightened.
If you make any mistakes, you can change your brush color to black with 100% opacity, and just paint over the mistake in the layer mask.
Using Blending Modes and the Brush Tool
An additional method of lightening and darkening specific areas of your image is to use the 'overlay' blending mode and the paint tool. Remember to always work on a copy of your image to avoid accidentally making permanent changes to your original.
Open your image in Acorn, File ▸ Open .
Following the instructions in the previous example, adjust the levels of your image. Then, duplicate the layer by selecting Layer ▸ Duplicate Layer (⇧⌘D). Change the blending mode of the duplicated layer to 'overlay'. Your image should now look similar to this:
It is likely that your image looks too dark now. Decrease the opacity of the top layer. This example uses an opacity of around 35%.
Now, select the paint tool and set the color to white. Choose a soft brush such as 'painting 8'. On the top layer, brush over any areas you want lightened with the white brush. You may need to lower the opacity of the brush if the results are too strong. Brush over the bride and groom's face, chest, shirt, and a few areas of her hair. Also brush over the wood on the far left side of the image.
Change the color of the brush to black. On the duplicated layer, brush over any areas you want darkened with the black brush. Brush over the groom's jacket, areas of his hair, and some of the wood towards the right of the image.
Wedding Couple © Thomas Wanhoff