pscc slides p3
TRANSCRIPT
![Page 1: Pscc slides p3](https://reader035.vdocument.in/reader035/viewer/2022062513/5556259ed8b42a28608b46cd/html5/thumbnails/1.jpg)
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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