The technique is fairly simple...
First... I must tell you that I have worked exclusively with PSP since the early days... I am up to PSP XII... the technique I am sure can be equally worked with Photoshop...
Obviously it requires a bit of an artistic hand and experience with air painting (real ones or the one tool in PSP)... as well as working in layers with changing opacities.
Basically, if it is a repaint... you NEED TO CLEAN UP THE ORIGINAL to bare basic background color (i.e.: eliminating the crude straight lines simulating ribs) [on this, I start with the basic single texture, copy it in a layer above... go back and paint the wing, stabilizer, or fuselage etc. the base color in the background layer)... THEN, decrease the copied layer in opacity to barely visible - to use it as a guide to place the repaint)... ] YOU CAN LEAVE IT AS A TOP LAYER AND PAINT LAYERS UNDERNEATH OVER THE BACKGROUND..
Once this is accomplished you eliminate that copied original but lighter layer...
So, you create a first layer for the ribs
I start one rib at a time... with a single line... use the diffusing tool and blurr it ... then on a layer immediately above... paint a thin line in white or whatever light color best suits the theme.. blurr it... and when the desired effect (trial and error.. you should have your PSP redos to a large number so you can go back and forth when you make mistakes) is accomplished, you merge that reflected light line over the darker wider diffused line in the layer below... That done... you continue to refine the rib shape conformation to your satisfaction... using this layer merging technique...
After you are finished... you duplicate that rib over and over the length of the flying surface... remember to make the rib longer than the width of the wing.. [on the rib layer]
When you deem it finished.. you can trim off the excess lengths with the shape tool set to 1 or 2 steps of feathering...
At this time you have two layers.. 1. background and 2. ribs immediately above...
START a new layer... where you put the leading edge sorftened reflected light [2 or 3 feather steps using the rectangle shape tool... or freehand... a light spray of white... and monkeying with the opacity of the layer to obtain the nice feathered reflected light effect...
YOU HAVE NOW 3 LAYERS.. 1. background 2. ribs and 3. reflected lights
The next upper layer.. you shape the perimeter of flaps a/o ailerons... and lay a soft black area (that you can set opacity to a nice subtle effect) you start another layer for a thin soft reflected light at the leading edge very close to the dark outline... using the rectangle tool... or free-hand.. draw this light line... when the desired effect is obtainged.. merge it to the darkish outline layer)
NOW YOU HAVE 4 LAYERS... background.. ribs.. reflected lights and aileron, flap a/or trim tabs...
GOING BACK TO THE RIB LAYER AND USING THE LATTER LAYER AS A GUIDE... ERASE THOSE AREAS IN THE RIB LAYER (if at all, the flying surfaces ribs are smaller than the wing sections and you can deal with them in the same manner)
As a final touch.. you can add a top layer (nr. 5 ) for overall reflected highlights... [I usually do a sharp, fairly thin rectangle of white... then spread all across the wing with the gaussian blurr adjustment tool and delineated over actual perimeter of the wing..
[again to my personal taste and impression].. and set the opacity of this layer to what one thinks should be a subtle reflected light tone]
You can then monkey around with the relative opacity of the layers to blend them into a homogenous finish...
THINGS TO KEEP IN MIND: 1. A merged top layer of lowered opacity will take on the opacity of the lower layer it is merged into... so to keep the desired opacity... blend the lower into the upper... otherwise you have to rework opacity to what your layers had when they were visually merged but not physically merged (so to speak because all these layers are not really phisically entities anyway) I guess I should use the work ACTUALLY instead of physically in the first place...
I came to this technique through trial and error... trying different tools and approaches.. and frankly... quite by serendipity...
If you have any questions you can contact me anytime... or
You can visit my site:
http://westwood.fortunecity.com/chanel/132/index.html
where you can see some of my work in aeronautical illustrations where you might get some ideas and can ask me how I do this of that...to incorporate it into your repaints...
Happy repainting... and clear skies.
[ps: I never thought about a tutorial on this so I need to prepare some intermediate step illustrations... but I hope this little discussion gets you going...]