Repairing_Digital_Photographs.(tutorial).Adobe.pdf

Repairing

Photographs

Adobe Senior Creative Director

Russell Brown shows you how to repair your

digital images with Adobe ® Photoshop ®

ADVANCED

Digital

In this demo, we will repair a photograph taken with a low-resolution

digital camera—in this case, the Kodak DC50. Often these cameras

produce excellent results, but they have a few deficiencies that can be

repaired digitally using layers. This technique is also quite useful for

repairing badly scanned images.

REPAIRING DIGITAL PHOTOGRAPHS, PART 1

1. Open your digital image

file in Photoshop. Zoom in

on the image and take a close

look at the problem areas,

especially noting the skin

tone in this image.

Preferences

For this demo, we

chose Preferences >

Display & Cursors, and

selected. Brush Size

and Precise.

2. Go through the RGB

channels. Press Command/

Ctrl+1 for the Red channel,

Command/Ctrl+2 for the

Green, and Command/

Ctrl+3 for the Blue channel.

Notice the artifacting and

extra noise in the Blue

channel. The Blue channel

is the telltale channel of a

scanned image and often will

show the errors of the scan.

Blue channel

The CCD (Charged

Couple Device) in

the camera is least

sensitive to the blues,

and it is more difficult

to interpret those colors.

Also, when you capture

an image with a digital

camera, it’s compressed

with JPEG compression.

The combination of

these two factors

creates noise in the

blue channel.

3. Zoom out of the image

and return to the RGB

composite. Here’s how to

easily fix this image using

Photoshop layers. Duplicate

the Base Layer by dragging it

onto the New Layer icon at

the bottom of the Layers

palette. Double-click this

new layer and rename it

Color Blur.

Shortcuts

Throughtout this docu-

ment, “Command/Ctrl”

means Command on the

Macintosh ® and Ctrl on

Windows ® . “Option/Alt”

means Option on the

Macintosh and Alt

on Windows.

REPAIRING DIGITAL PHOTOGRAPHS, PART 1

4. Choose Filter > Blur >

Gaussian Blur. Choose values

based on the resolution of

the image. You want to soften

the image—not lose the

image completely, but soften

it—especially in the troubled

area of the blue channel.

5. With the Color Blur layer

still targeted, create an

overlay of the two layers

using Color mode from the

pop-up menu in the Layers

palette.

Color mode

Colors are overlaid on

the existing pixels while

the highlights and

shadows of the base

color are preserved.

The base color is not

replaced, but is mixed

with the blend color to

reflect the lightness and

darkness of the original.

6. Zoom in to the image

and look at the same area.

Press Command/Ctrl+3 to

go to the blue channel again.

See how the noise has been

smoothed out. Amazing but

true! But wait, there’s more...

REPAIRING DIGITAL PHOTOGRAPHS, PART 1

7. Let’s continue working

with this image and give it

more of a portrait look by

softening the focus of the

image, as if it were shot

through a special filter.

Duplicate the Color Blur

layer by dragging it to the

New Layer icon, and then

double-click the new layer

and rename it Soft Focus.

8. With the Soft Focus layer

targeted, change the mode

back to Normal and set

opacity to 30%. This creates

a nice soft look around the

edges of the image, especially

the face, hair, and hat areas.

Opacity Tip

When a selection tool

is active, pressing any

of the numeric keys

changes the opacity

to the corresponding

percentage. Press 1 for

10%, 0 for 100%, and

so on.

9. The eyes are also being

softened, which is not

something we want, so we

will create another layer to

sharpen parts of the image.

Duplicate the original Base

Layer, and then move it to

the top (above the Soft Focus

layer). Name this layer

Sharpen Details.

REPAIRING DIGITAL PHOTOGRAPHS, PART 1

10. Create a new layer by

clicking the New Layer icon,

and then move it to the

bottom of the stack. Option-

click the eye icon for this

layer, and then choose Select

All and fill the layer with

white. Deselect. This new

layer is needed only to

preview the effects of blend-

ing layers—which you are

about to see.

Fill shortcut

Pressing Option/Alt+

Delete fills the area

with the foreground

color. Pressing

Command/Ctrl+Delete

fills the area with the

background color.

11. Click the eye icon for

the Sharpen Details layer so

that only the bottom and top

layers are visible. Target the

Sharpen Details layer.

12. Now we will isolate the

areas of this layer that need

to overlay the image. Double-

click the layer to bring up the

Layer Options dialog box.

Make sure Preview is checked.

Move the This Layer high-

value range slider (white

triangle) to the left. Notice

that areas of the face and hat

are being eliminated.

Blending Layers

The sliders here let you

define which pixels are

blended by indicating

a range of brightness

values for the replace-

ment pixels. In our

example, the highlight

range was split to

soften the layer, giving

it a semi-transparent

and fogged look. The

further apart the

triangles, the softer the

appearance of the layer.

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