Graphics&Design Correction and Adjustment - Creative: colour & tone, dust & marks, sharp Tech:...
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Transcript of Graphics&Design Correction and Adjustment - Creative: colour & tone, dust & marks, sharp Tech:...
Graphics&DesignCorrection and Adjustment - Creative: colour & tone, dust & marks, sharpTech: Gamma, Histograms, & Convolution
Graphics&Design
colour & contrast
• levels• curves• hue & saturation• channel mixer
Graphics&Design
gamma curves
Equivalent to Brightness & Contrast
‘brightness’ - loss of highlight detail
‘darken’ - loss of shadow detail
‘increased contrast’ - loss of both
Graphics&Design
gamma curves & levels
Improved using Curves
‘brightness’ - loss of highlight detail
‘gamma curve’ - retains shadow & highlight detail
Levels histogram - sample with ‘eyedroppers
Graphics&Design
dust & scratches
Original
‘Old Image’
damaged with scratches and other age marks
Partial restoration with Dust & Scratches filter. Some loss of definition - (note blurred tie.)
Complete restoration with ‘Heal’ brush. A similar effect could be obtained from the Stamp tool
Graphics&Design
Technical - Unsharp Mask
Unsharp mask - masks the ‘unsharp’ bits
• uses a ‘convolution’ filter to detect edges
•Uses the edges to make mask
•Increases contrast in masked area
Original Convolution Unsharp masking Custom filter