Pscc slides p3

Adobe Photoshop CC: The Professional Portfolio

Project 3: Menu Image Correction

Retouching digital Images

Correcting lighting problems

Correcting color problems

Preparing images for print

Working with HDR images

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Removing GrainSmall visible artifacts throughout

Often caused by physical grain in photographic film

Especially evident in:– older photos

– scans of photographic prints

– large areas of solid color/low contrast

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Removing Grain (cont’d)Gaussian Blur:– Blurs entire image by a

specific amount (radius)

– Removes grain, but also blurs detail

Sharpening:– Increases contrast

along edges

– Restores areas of detail after Gaussian blur

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Healing toolsSpot Healing Brush tool– Blends surrounding pixels

Healing Brush tool – Blends pixels based on user-defined source

pixels

Patch tool – Replaces pixels with other (user-defined) pixels

Clone tool– “Paints” pixels from one area onto another area

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Healing Tools (cont’d)

Brush size, hardness are key

Option/Alt-click to define the healing source (A)Align the Healing Brush source– Off: source pixels always begin

at the original defined point (B)

– On: source pixels are relative to tool cursor (C)

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Clone toolOption/Alt-click to define source pixels

Click to replace other pixels

Soft-edge brush: – Blend old and new

areas without noticeable edges

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Content-Aware FillRemove elements from an image

Available in the Fill dialog box

Available as an option for the Spot Healing Brush tool

Doesn’t workwell over sharp edges

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LightingDifferent types of lights:– Highlights

– Specular highlights

– Shadows

– Midtones (gammas)

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Brightness/ContrastBrightness– Apparent luminance

Contrast– Tonal variation throughout

Saturation– Variation of color away from gray

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LevelsTonal range– Available tones in a

given color model

– Depicted in histogram

– Peaks show areas of interest

– More tones = more contrast

– Extend image tones across entire tonal range to increase overall contrast

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Levels (cont’d)Adjust entire image or individual channels

Define highlight and shadow points first– Press Option/Alt while

dragging slider

– Dust your monitor to see the first spots

Drag Gamma Input slider to increase contrast in half of the image

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Exposure AdjustmentIntended for HDR images

Corrects apparent under- or overexposure issues

Exposure, Offset, Gamma Correction

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Color CorrectionColor terminology

Gray balance– Equal parts of primaries = neutral gray

Color Cast

Info panel

Color Sampler tool

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Color Balance AdjustmentCorrect based on complementary colors

Subtract predominant primary or add its complement

Not as precise as curves adjustment

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CurvesAdjust input, output values – Entire image

– Individual color channels

Use input sliders to correct tonal range

Aim for neutral gray

Steeper curve = More tonal range, more contrast

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Additive vs. Subtractive Color

RGB (additive) is for digitalCMYK (subtractive) is for printingGamut = number of available colors in a particular output model

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Color ManagementBased on profiles

Translate color from one model to another

LAB space is the “translator”

Out-of-gamut colors are converted based on the defined rendering intent

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Color Management (cont’d)Edit>Color Settings to define working profiles

Embedded image profiles

– Saved in file when created, scanned, or photographed

– As a general rule, don’t convert when opening/copying

View>Gamut Warning

View>Proof Colors

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Correction for PrintCorrect in RGB, then convert

Correct to get the best-possible results in the intended output space

Don’t rely on your eyes

View>Proof Colors View>Gamut Warning

Original

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Correction for Print (cont’d)Minimum printable dot

Maximum printable dot

Define targets in the Curves dialog box

then

Identify highlight and shadow points in the image

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Converting Color ModelsDefine output profile

Image>Mode>CMYK

Edit>Convert to Profile

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Converting to GrayscaleImage>Mode> Grayscale

Image>Adjustments> Desaturate

Image>Adjustments> Black & White

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HDR ImagesHDR = High Dynamic Range

32 bits per color channel allows “infinite” color

File>Automate> Merge to HDR Pro

If saving for CMYK print, must be 8-bit