Burn suppression in photoshop

[duke2]

Reinhard Rocks - it has good colour reproduction, and it's predictable, but it's only slightly better at reducing burnout than linear (which doesn't even attempt to do it). Exponential is great. You can be guaranteed to get no burnout, but it shits up your colours. So instead, try this.



It's not perfect, but it takes the cringe-worthy edge off the burnouts (I stuck with 10% opacity).

[victor.nsy]

any blown up shot to show those area that it can fix , kinda like before and
after thing? Looks promising to me ... photoshop fan

[Neilg]

Isnt changing the burn value within reinhard supposed to change that?

[duke2]

I think so yeah, but I rather tweak it in Photoshop after the render. My example does look a bit flat but its tweakable using the levels adjustment layer. As long as the render and photoshopped result don't differ too wildy (like they do when you render something out of any other program than VRay and try to do tone-mapping in something else, giving you a different result which you have to go back and render each time), it's as much as a finishing touch as a little sharpening.

[dlparisi]

I'm confused about this... Isn't a lot easier and possible less problematic to just put a simple curve adjustment onto the original image and get basically the same results?

[simmsimaging]

You could also do this with Shadows + Highlights, or just use select colour range, choose highlights, and float that and switch to multiply.

b

[duke2]

With regards to the curves option. I hate photoshop curves. Unless i'm using the wrong one, it doesn't allow bezier handles so to make the curve you *want* you have to add alot of points to tame it's auto-tangent thing.

[Clifton Santiago]

You could just render linear, save as 32-bit EXR, then reduce highlights in full-float. In CS3 extended (and maybe regular), when converting to 8 or 16 bit, you are prompted with an HDR conversion dialog. Go to the Method pulldown that says Exposure and Gamma, and switch to Local Adaptation, which is the only option with a curve editor. You can easily reduce the hotspots with that.

Or get the CS3 plugin (I forget the name) that does Reinhard tonemapping in photoshop. Or use Photomatix (for cs3 or standalone) on your EXR, and tweak for more realistic output. Photomatix doesn't have a specific Reinhard option, but it should be close enough.

[victor.nsy]

You could just render linear, save as 32-bit EXR,...

Yep , I second that. Most probably a faster way and you could also play with lots
of variation in exposure if you want to.

[stupendousman_dk]

I stick with Clifton Santiago too... much easier and more colours must be better when destructing the rendering.

[PGD]

I may be missing something here, but I tried Clifton's method quickly and didnt get anywhere with it. I was using CS2, does CS3 have more options of adjustment available?

I often adjust the exposure of an image with PS adjustments, PS3 allows an adjustment layer to be added so its easy to tweek/adjust back anytime later. I just didnt see the advantage of the exr file?

Duke, that method looks like hard work for very little to me (perhaps just me being lazy this aft )

[Clifton Santiago]

You really need CS3 extended for the most 32-bit editing options. EXR is the best 32-bit file format.

http://www.anyhere.com/gward/hdrenc/hdr_encodings.html

And, like i mentioned, it helps to get tonemapping plugins.

http://www.hdrsoft.com/

Also, you can add this plugin to HDR shop (though you might have to convert your EXR to HDR in 1.0:

http://www.gregdowning.com/HDRI/tonemap/Reinhard/

You might also be able to tonemap EXR's in HDRShop 2.0 and higher.

http://gl.ict.usc.edu/HDRShop/

Paul Debevec also said he was issuing HDR shop 3.0 soon.