There's
a whole bunch of plugins that can light a fire in
Your images.. but none of them does it for free
and most of them gives crappy results. As with so
many other things in photoshop, Your much better
of without the plugins! Here's a guide on how to
make realistic fire.
This tutorial is a simplified version of Greg Vander
Houwen's great fire tutorial which can be found
at www.photoshoptechniques.com.
I suggest that you take a look at his tutorial if
you are a more experienced user of photoshop. His
version also includes a quicktime instructional
video, so if your ready for some more advanced fire
effects go visit his site.
Here we go: 1::
Run photoshop. Go to |file/new| or press |ctrl-n|.
Make a new document that's about 300x400 pixels.
Set the background to be white. Press |ok|.
2::
Press |t| which is the shortcut for the font-tool.
Press |d| with the font tool selected to make the
font color black. Find a font that You like.. the
best results come when choosing a bold font. I'm
using Arial Black in this tutorial. Now, write the
text that You want to set on fire. 
Remember to leave some space for the flames!
3::
Press |alt-ctrl-shift-n| to make a new layer. After
You've done this, press |alt-ctrl-shift-e| to merge
all visible layers to the new layer while retaining
the layer hierarchy Now we need to rotate the layer
90°. Do this by pressing |edit|transform|90
ccw|.
4::
Press |ctrl-i| to invert the colors. 
After that, go to |filter|stylize|wind| and copy
my settings from bellow: 
Press |ok|.
Then You need to press |ctrl-f| to repeat the filter.
Do this two times. 5::
Rotate the layer back to it's initial position by
going to |edit/transform/90 cw|. Then go to |filters/blur/gausian
blur| and copy my settings from below:
Press |ok|. 6::
Go to |image/adjust/hue-saturation| or Press |ctrl-u|
and copy my settings: 
Press |ok|.
7::
Go to |filter/liquify| or press |shift-ctrl-x|.
Select the upper left tool and find a fitting brush
size. After this You need to draw the flames out
from the image:
8::
Make a copy of the layer by pulling it from the
layer menu down to the new layer icon. After You've
done this, go to |image/adjust/hue-saturation| and
copy my settings: 
Press |ok|.
Set layer mode to |overlay| in the layer mode drop
down.
9::
Now we need some glow to spice up the flames!
Make a new layer |alt-ctrl-shift-n| and press
|alt-ctrl-shift-e| to merge all visible layers
onto the new layer. Set layer-mode to screen.
Go to |filter/blur/gausian-blur| and copy my settings:

Press |ok|.
Spiffy aint it? =)

10::
Congratulations!! You've made it all the way through
the tutorial.

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