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


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


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


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


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)


Clone toolOption/Alt-click to define source pixels

Click to replace other pixels

Soft-edge brush: – Blend old and new

areas without noticeable edges


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


LightingDifferent types of lights:– Highlights

– Specular highlights

– Shadows

– Midtones (gammas)


Brightness/ContrastBrightness– Apparent luminance

Contrast– Tonal variation throughout

Saturation– Variation of color away from gray


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


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


Exposure AdjustmentIntended for HDR images

Corrects apparent under- or overexposure issues

Exposure, Offset, Gamma Correction


Color CorrectionColor terminology

Gray balance– Equal parts of primaries = neutral gray

Color Cast

Info panel

Color Sampler tool


Color Balance AdjustmentCorrect based on complementary colors

Subtract predominant primary or add its complement

Not as precise as curves adjustment


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


Additive vs. Subtractive Color

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


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


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


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


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


Converting Color ModelsDefine output profile

Image>Mode>CMYK

Edit>Convert to Profile


Converting to GrayscaleImage>Mode> Grayscale

Image>Adjustments> Desaturate

Image>Adjustments> Black & White


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

Pscc slides p3

Education

Transcript of Pscc slides p3