Photoshop: Channel Masking
28/10/2013 § Leave a comment
In Stephen’s tutorial today, we were to successfully cut out and place something onto a new background.
We began with this image below:
The first step was to open the Channels tab and locate which channel had the biggest contrast between the background and the models hair – in this case, it was the blue channel.
We had to duplicate this channel (renaming it mask even though it’s not) and from here we were to adjust the levels so that the background was white. We then proceeded to select the paintbrush tool to black out the model, making sure the gaps in her hair remained white. This then meant that we could switch the paintbrush tool to overlay, adjusted the opacity of the image and then painting over the hair again.
This finds shades of grey within our image and turns them black if they are over a certain percentage.
Our next step is to select the channel we created and inverting it so that we can make a mask. From here, we can place our new background below the layer. Unfortunately, you might be able to see a white halo outlining the model – to remove this we need to delete the layer mask and channel before repeating the entire process again. Before we can make the mask however, a little refining around the edges is needed. To remove the halo we need to change the edge’s percentage to a negative number and create a 2px feather to help blend the model into her new background. It’s a long process, but it gets really great results in the end up.