This is another one of those “notes to myself” posts – this time about how to add a lens blur to an image (simulating depth of field) in Photoshop CS4. This particular YouTube video did the trick – seems to be the simplest approach to an easy blur.
Here’s my distillation of the process:
- Open the JPG file.
- Use CMD-J to duplicate the layer.
- Switch to Channels and add a mask.
- Click on both the new Alpha Mask and RGB and then paint the area that you want sharp in the image.
- Select the RGB channel, pull down Filters-Blur-Lens Blur and adjust the settings as appropriate. Click save.
- Then go back to the Channels and hold down Cmd while clicking on the Alpha mask – this will re-select the original mask.
- Pull down Filters-Sharpen-Unsharp Mask and adjust as appropriate. Deselect the selection and you’re ready to save.
Here’s the effect in action.
Here’s a pretty comprehensive list of additional photography tips from Smashing Magazine.