DIGITAL RENDERINGWith Adobe Photoshop

Sachin Bijadi

WHY DIGITAL SKETCHING & RENDERING?A digital sketch makes it easier to adapt to a design relatively easily

- easier to process in digital workflow

- work with multiple layers easily unlike paper

- The ‘UNDO’ button!

- Make quick variations – color, form, scale – without having to redraw everything from scratch

- Provide realistic looking material finish for sketches

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Courtesy: “Sketching- the Basic”, Koos Eissen & Roselien Steur

1. Import scanned sketch into Photoshop

• Scan your hand sketch and save as Jpeg.

• In Photoshop, import the jpeg file.• Clean up any rough lines, smudges,

stray pen marks, etc. • Use ‘Levels’ adjustment in

Photoshop (if necessary) to increase intensity and contrast of the sketch against the background

• This edited jpeg becomes your background layer.

• Create a copy of this layer (‘Background copy’) and use blend mode ‘Multiply’. (All renderings will be done on layers sandwiched between these 2)

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2. Applying the base tone

• Start rendering by applying a base tone (30-40% grey)

• Block in the sketch using brush tool

• Fill in the inside with the same color quickly with the paint bucket tool

• Adjust opacity of layer to get a required level of base tone

• We’ll be adding darks and lights over this base tone to get highlights and shadows

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3. Applying darker shades to shadowed areas

• Let us assume that the light is falling on the printer from the top right corner of the sheet, highlighting the top and putting other parts into shadow.

• With lasso tool, select the shadowy area in the front recess of the printer.

• Add a darker shade of gray to indicate shadowed area

• Similarly, use brush tool (with hard edges) of appropriate brush size, and apply a darker shade to both the side panels of the printer to indicate different material of side panels

• This brings out depth of the sketch.

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4. Rendering the curved surfaces

• Add a glint of white using a soft airbrush on the side recessed handle. This gives perception of depth to the sketch and makes it pop from the page.

• Next we create the shadow core on the rounded surfaces of the top

• Use the polygonal lasso tool to select the curved surface shown and create a new layer.

• Select a suitable shade of grey and paint over this selected area using a soft airbrush. (Use Gaussian blur and control opacity to get required shade and effect)

• Select a soft airbrush (use a darker black) and dab 2-3 times

• Now using free transform (Ctrl+T), manipulate this shape to create a core shadow for the curved form of the top front of the printer. Adjust the shape and color intensity to match the surface and the surrounding color tones.

• Copy this core shadow layer and use it to similarly highlight the curved surface of the printer top back surface

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5. Good contrast

• Apply a dark shade of grey to the recess on the top face of the printer.

• Use a soft eraser tool to lighten the center (Note: Light never hits a surface evenly – this variation hints that the surface is catching a glint of light)

• Now darken the serrated ridge in the front (paper exit area) where it lies in the shadow of the printer top. Zoom out and check the tone of the color in relation to the rest of the printer. Adjust opacity of layer as required.

• Darken the side panels of the printer. Get good contrast (circled zone below) to highlight the 2 separate surfaces of the side panels

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6. Details and features

• Select the printer front face using the Polygonal lasso tool (Use Shift + left mouse button to select the 2 separate halves of the front surface)

• Add dark color at the bottom to achieve good contrast (Use of soft airbrush of large brush size)

• Highlight the features on the printer: Use different colors from the color palette (from the right side panel) and color in the LED features on the front right surface of the printer with a hard edged airbrush of appropriate size.

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7. Paper tray

• With the polygonal lasso tool select the arrow indicating the movement of the paper on the output tray.

• Select a color that helps pop the arrow from the rest of the printer, and using the gradient tool, drag the mouse from the lower end of the arrow towards the arrowhead to get a clear gradient (this indicates movement/action)

• Color in the bottom paper tray with a dark tone with a hard-edged brush, on a layer below the colored arrow layer (so that the arrow appears above the tray. (use a combination of brush and eraser to color in the required parts)

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8. Highlights

• Similar to the core shadow applied to the front curved surface of the printer top, add a white highlight to the top surface

• Select white and use a soft airbrush to dab 2-3 times on any area till you get a good contrast with the core shadow.

• Using free transform, manipulate the shape to create the highlight as shown.

• Color in the paper in the output tray to an even white color (lasso to select and hard-edged airbrush to color)

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9. Vignette

• Create a new layer just above the Background layer (i.e. below all the other layers we have created till now)

• Using the rectangular marquee tool create a rectangular shape Use gradient tool to create a black to white gradient

• Either use an eraser or Delete overlap area (using lasso tool) to remove the gradient on top of the printer (circled area)

• Use a big soft brush and erase some of the hard backdrop edges of the gradient (indicative of a table on which the printer is sitting)

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10. Reflection and shadows

• Use the polygonal lasso to mark an area below the printer to create a reflection

• Use gradient tool• With a soft eraser lighten the

area like with the vignette before to achieve desired effect

• Select the printer shadow at the bottom left of the sketch with polygonal lasso tool

• Apply gradient tool like with the vignette to create drop shadow

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FINAL RENDERED IMAGE

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3D RENDERING

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3D RENDERING

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3D RENDERING

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PDes 5710 INNOVATIVE COMPUTER MODELING & RENDERING FOR

PRODCUT DESIGNSpring