CrossProcessing shader

Hi ! I’m doing a lot of image processing at work since a few weeks, and there a lots of things I wanna try, from post processes to dynamic geometry, but I would need another life for that. After having watched some (really nice) super cars videos (just check at the first one showing the Corvette to see what I mean), I’ve been talking with Nico about the Cross Processing effect, also called xpro, used in photography, and probably in the Corvette video.

After a quick talk (thanks) I made a simple pixel shader that post process a given scene with this nice effect 🙂

I followed this Photoshop tutorial to make it, here are the steps to work with the shader:

• Make a black-to-white gradient
• Add a New fill or adjustment layer, select Curves, and set the curves just like in the tutorial

• Save the 1D image, it’ll be used in the pixel shader just like a curve modifier
• Modify the final color of your pixels with this (GLSL) code:

vec3 curvesColor;

curvesColor.r = texture1D(curveTex, pixelColor.r ).r;
curvesColor.g = texture1D(curveTex, pixelColor.g).g;
curvesColor.b = texture1D(curveTex, pixelColor.b).b;

gl_FragColor.rgb = curvesColor;

And voila ! Here are some screenshots I took in Reverse (my end of studies project [team of 6 students]), maybe not the best example for this kind of effect but anyway:

Without

Without

With

With

With

With

In fact it makes me think about color temperature again, but this time the color is modifyed per channel and is dependent to the color components themselves instead of the luminance component of the pixel.

One more screen with all the effects combined during turbo (dolly zoom, desaturation, radial motion blur):

With

Well, I guess these are the first public screenshots of the final version of the game 🙂

Oh and by the way …

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Kinda color temperature

Hi all, I’m not dead.

I saw an interesting image the other day, that directly made me think about the color temperature concept. It comes from the game Fallen Empire: Legions, upcoming Tribes clone running in a web browser on instantaction.com. It produces another interesting effect, because it seems to use another color palette and still link it to the luminance of the object’s pixels.

Maybe they’re not doing anything like this to get this particular lighting and they are using multiple lights or even any photoshop treatment, but it could be and that’s the way I interpreted it 🙂