Introducción a la Investigación

06

First, drag and drop the Occlusion pass onto your scene. A dialog box will appear. Choose Alpha Channel then hit OK. Put the Occlusion layer at the top of the stacking order by either drag and dropping from the Layers panel or go to Layer>Arrange>Bring to Front. Then change its blending mode from Normal to Multiply. Drag and drop the Ground Shadow onto the scene. With the layer selected, go to Layer>Arrange>Send to Back and also change its blending mode to Multiply.

05

Go to the Layers panel and select Reflection 1, then go to Filter>Camera Raw. The goal here is to increase the contrast and highlights. Try to play around with the values, but feel free to use my settings: Temperature 4400, Tint 10, Exposure -0.15, Contrast 33, Highlights 24, Shadows -17, Whites -15, Blacks -1, Clarity 72, Vibrance -25, Saturation 0. If you want to remove any artefacts in any pass – for example, I found super blown-out pixels in the Specular pass – go to Layer>Layer Mask>Reveal All, then with a black brush, paint on the blown-out pixels to hide them.

04

Import the main passes into Photoshop (Lighting, Global Illumination, Reflection 1, Reflection 2, Refraction and Specular). Drag and drop the files onto the street scene. The layer order isn’t important, but my personal preference is to put the lighting at the bottom. Then change the blending mode of the rest of the passes. To do this, select them, go to the Layers panel and change the blending mode from Normal to Add. While they are still selected, go to Layer>Create Clipping Mask to prevent any artefacts appearing around the edges.

08

The easiest way to use the RGB mask is to put it at the top of the layer stack. Go to the Channels panel, Cmd/Ctrl-click on any channel you want to make a selection from, then you can make an alpha for each one. If you select the red channel, it will automatically create a selection on the car body. Invert this selection by going to Select>Inverse. Go to the Layers panel and hide the RGB mask by clicking on the eye icon. Go to the Hue/Saturation adjustment layer, click on its mask and make sure that the background colour is black. Hit Cmd/Ctrl+Backspace.

07

You can make the car whatever colour you want, but first you need to know what passes make up the colour. In our case they are Lighting, Specular and GI. So to change the colour of the car, drag the Specular and GI passes just above the Lighting layer and then go to Layer>New Adjustment Layer>Hue/ Saturation and play around with the values (I used Hue -133, Saturation -72, and Value -5). Then go to Layer>New Adjustment Layer> Exposure and enter the values Exposure -0.28, Offset -0.0165, Gamma Correction 0.50.

With the render passes, you can easily make major changes to your images after rendering them. For example, we used them in this tutorial to change the colour of the car without changing the reflection or refraction colours.

03

In order to get a great glowing effect and colours, you have to use 32-bit images, so convert the background to 32 bit and adjust it with Camera Raw. To do this, open your document in Photoshop and go to Image>Mode>32 Bits/Channel. Then go to Filter>Camera Raw. Adjust your image to get the look you want to achieve. I set Temperature to 4150, Tint to 10, Exposure to -1.15, Contrast to 12, Highlights to -51, Shadows to 33, Whites to 41, Blacks to 100, Clarity to 8, Vibrance to 31 and Saturation to 0.

11

In reality, any specular or highlight reflection has some glow in it. In order to make this glow on the car, duplicate the Specular and Reflection passes by selecting them from the Layers panel, then go to Layer>Duplicate Layer and press OK. Release them from the clipping mask by going to Layer>Release Clipping Mask, then drag them from the Layers

10

You can paint with a bright colour on the headlight to create an optical flare, or you can just use the one that I made provided on FileSilo. Drag and drop the light burst file onto the scene and make sure that you put it on the top of the stacking order by going to Layer> Arrange>Bring to Front, then scale it and position it on the car headlights. Duplicate it to the other one by Opt/ Alt-clicking and change its blend mode to Add using the drop-down in the Layers panel.

09

Show the RGB layer mask from the Layers panel, then go to the Channels panel and Cmd/ Ctrl-click on the green channel. Then hide the RGB mask again and create an Exposure adjustment layer right underneath the Occlusion layer and lower the Gamma value to 0.8

002

001 Prepare the background

Set the background to 32 bit and adjust its colour and intensity

001 ₀₀₃

002

003 RGB mask

Use the RGB mask to easily make adjustments to certain areas of the image

002 Import the passes

Combine the render passes in Photoshop and change the blend mode to Add

panel just underneath the Occlusion Shadow layer. Some of the layers will be out of the clipping mask, so you have to bring them back in again. Merge the duplicated layers by selecting them in the Layers panel and go to Layer>Merge Layers, blur them using Filter>Blur>Gaussian Blur at 3 pixels, then change the blend mode to Add.

CREATIVE LIGHTING EFFECTS

The render passes are very