An Adobe Photoshop often forgotten filter
Fire is a very popular digital substance these days. There are photo art actions that will set any subject on fire. There are photos of fire carefully extracted and served as PNG files to graphic artists. And there are well-known paint programs and 3rd party filters, such as Alien Skin’s Eye Candy, that offer their renditions of fire and flame. However, Photoshop itself has been offering a way to render flames since at least CC 2014. It is no longer available as a scripted pattern fill (Edit> Fill), but now solely resides in the Render menu, along with Trees, Frames, Clouds, Lighting, and more. Many of us tend to forget that the Flame filter even exists. The other day I remembered it when I wanted a few flames for an art journal page, and decided to reacquaint myself, so I created a simple image to walk through the process and share with you—just in case, like me, you tend to forget how something works when you go a long time without using it.
To use the Flame filter in Photoshop, you first need to create a path. The Pen tool is the obvious method for drawing a path, but for those of you who find the Pen tool intimidating, you can also use a Shape drawn with the Path setting in the Options bar. The main limitation to using a Shape is that it’s always a closed path that encloses empty space, even if a very narrow empty space. It will still generate flames, but it won’t look the same as a flame drawn with the Pen tool. However, that’s not only not always bad, but using a shape is also a quick way to produce an image if you want a burning heart (or house or. . . ).
Once you’ve drawn your path (multiple paths can reside on the same layer), it’s a good idea to save your path layer by double-clicking on it and naming it. You’ll probably want to be able to return to it to adjust or use for another flame. Next, create a new, empty layer—the filter always returns pixels and won’t run as a Smart Filter, so protect your image from a destructive operation. With the path active in the Paths panel (you can see the path in the document window), and the empty layer targeted, choose Filter> Render> Flame. . . . In the dialog, experiment with the different settings in the Flame Type list and their sliders to see what looks best. You can also select a custom color for your flames.
Once you have constructed a flame type that you think is very close to what you want, you can choose the Advanced tab to modify the results even more. Most of the settings here are subtle, although some can make a significant difference in the result. For this demonstration, I only used the Basic tab, which in many cases is all you’ll need. Click OK to render the flame(s). Now you can deselect the path in the Paths panel and create another path, or several more paths, on separate layers, to complete the image of your object on fire. For my example, I rendered different flame layers using different paths, and used custom colors, blend modes, and opacity. Where necessary, I modified the paths while looking at the rendered flames on a layer, then turned off the layer, created a new one, and re-ran the filter. I also used Free Transform on rendered flame layers to help them fit the image better.
With its decent preview and straightforward sliders, Flame does a pretty good job for anyone who doesn’t need to add lots of flames to everything. If you want greater realism or an organic feel to your flames, building up your fire from multiple flame layers can get you closer than you might expect. But if you want a stylized graphic, this filter has got that covered, too. For occasional use, if you’re willing to toy with the sliders and adjust the paths, I think you’ll find it adequate for most purposes, without forcing you to think you have to spend a lot of money on 3rd party solutions.