v-ray image post-processing in photoshop
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V-Ray Image Post-Processing in Photoshop
Image Post-Processing in Photoshop by Teofilo Pardo
This tutorial has been designed for those people who are not using Photoshop as much as they should in their post-
processing workflow or not using it on a regular basis. It incorporates lots of hints and tips and shows what can be done in
the post-processing of a V-ray output image of a SketchUp model. It could also be an output image from any render engine
that you want to tweak and improve. So here we go!
Step 1.Lets open the rendered output image in Photoshop.
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Step 1
Step 2.Go to Image>Adjustments>Brightness/Contrast.
Step 2
Step 3.Now the brightness and contrast would be different in every image, and its a personal choice how much brightness
and contrast you want to apply, because m aybe this im age looks too bright on some monitors or too dark in others. Maybe
you want to have very dark shadows, so you have to experiment with it. In the end, its your eyes that decide.
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Step 3
The result of those first adjustments.
Result of first adjustments
Step 4. Next go to Image>Adjustments>Hue/Saturation.
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Step 4
Step 5.Choose -13 in Saturation because in this case I think the colors are to strong. Again this is a personal choice to use
it or not, I use it sometimes depending on the render.
Step 5
Here we have the result of adjus ting the saturation.
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Result of adjusting the saturation
Step 6.Next go to Image>Adjustments>Selective Color.
Step 6
With Selective Color you can adjust any color on your image. For example if you choose green, all green colors will be
affected and changed depending on how you adjus t the cyan, magenta, yellow and black. So this is a nice option to
experiment with.
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Selective color
Step 7.For this particular image at this stage I chose Neutrals and adjus ted the cyan to -7 and yellow to +9, to correct the
color of the scene. This can als o be done with the color balance option by going to Image>Adjustments>Color Balance, but
found this method quicker and easier. The colors you can get can give you some interesting and dramatic effects with the
color in your image.
Step 7
In these two im ages you can s ee two effects achieved by this method. A blue cinematic effect and a green effect. This all
helps to give an artistic touch to your renders. It all depends on what you are looking for and trying to achieve. Please note
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that this can all be done with the Photo Filter option by going to Image>Adjus tments>Photo Filter, but this method gives me a
little more control on colors .
Effects achieved by this method
The end result.
End result
Step 8.Now lets go to Diffuse Glow by selecting Filter>Distort>Diffuse Glow and apply a little to this image.
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Step 8
Step 9.Choos e 2 in the Glow Amount, but you can go crazy and make it 3, 4, 6, 7 etc its up to you.
Step 9
The end result.
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End result
Step 10.Here comes an interesting part. Go to Filter>Distort>Lens Correction.
Step 10
Step 11.I always us e Chromatic Aberration and its a very interesting option because it gives a very photo-realistic touch to
the image. Again, how you use it depends on what effect you want for your image. In this case I chose -15 on Fix Red/Cyan
Fringe and +9 on Fix Blue/Yellow Fringe and again you can go crazy and play with the adjustments to get a lot of different
results.
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Step 11
Step 12.The Vignette option below Chromatic Aberration is also an interesting one. It can give a deep effect to your image. In
this case I chose -25 and what this does is give us a dark shadow to the perimeter of the image. It gives a feeling of some
kind of shadow frame for our main focus objects, which are the flower and the table. You can also move the midpoint to sui
your needs if necessary.
Step 12
The end result.
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End result
Step 13.Now lets move on to the Blur Tool it is the one circled in red. What this tool does is give us a depth of field effect
(DoF). Now there are plug-ins out there that will do this and I dont want to go into them now and anyway this is a nice easy
method. You can us e it if you don t want to do DoF in V-Ray.
Step 13
Step 14. Now you have to adjus t the Master Diam eter and the Hardness which I almost always leave at 0% and the further
the object is the more blur we will apply (well in this case at least), it all depends where your main focus is ,in this image i
is the flowers and the table.
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Step 14
Step 15.As you can see I applied the Blur Tool to the black couch, a little on the rug and some more on the door to the right.
Next I need to apply it to the red chair (tip: to change the Master Diameter and the Hardness, just right click with the mouse
when us ing the blur tool).
Step 15
Step 16.For the red chair lets use the Zoom Tool, circled in red. I can be more accurate when applying the Blur Tool to the
red chair and not accidentally apply it to the flowers.
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Step 16
Here is the result after applying the Blur Tool and remember to use the Zoom Tool for little areas.
Result after applying Blur Tool
Step 17.Let us use the Photo Filter option by clicking on Image>Adjustments>Photo Filter. This is a very good option for
blending an image to a warm or cool color.
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Step 17
Step 18.In the Photo Filter Window by default appears the Warm Filter with 25% Density. You can change this by clicking on
the little drop down menu and you will get a selection of preset filters. You can als o click on the color box and create a filter
with the color you want.
Step 18
The result with the Warm Filter.
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Warm Filter Resul t
Here are some examples of different filters.
Various filters
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Post-processed image-1 and the s traight V-Ray render
In the image below I used Smart Sharpen, adjusted Brightness /Contrast and added m ore Vignette and Chromatic
Aberration. And the straight V-ray render for comparison.
Post-processed image-2 and the s traight V-Ray render
I hope you enjoyed this tutorial and m ost of all that it has been helpful in your post-process ing work-flow.
Teofilo
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Final Image
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