by philip lawson digital imaging 5 the basics - scanning and printing the master image working with...
TRANSCRIPT
By
Philip
Lawson
Digital Imaging 5•The Basics - Scanning and Printing•The Master Image•Working with Layers•Working with Channels•Black and White
Greyscale• By Black and White we really mean
a Monochromatic Greyscale Image• Or a Duotone• Or a Line Drawing
Greyscale Printing• Printing Greyscale images is
Problematic• Printing in Colour Inks leads to
– Colour casts– Lack of decent blacks
• Printing in Black Ink leads to– Lack of decent gradation
• Best to use Greyscale Ink Printers– Differing density inks and– Differing dot sizes
Greyscale• By Black and White we really mean
a Monochromatic Greyscale Image• Or a Duotone• Or a Tritone• Or a Line Drawing
Creating Greyscale 1• Scan in Monochrome• “Image->Mode->Greyscale”• “Image->Adjust->Desaturate”• Copy a Channel to a New Greyscale
Image
Creating Greyscale 2• Create a new Layer and Flood fill
with Filter Colour of your choice• Create a Hue/Saturation Adjustment
Layer and set Saturation to –100%• Manipulate Opacity to
obtain desired effect• Flatten Layers• Change Mode to Greyscale
Adjusting Greyscale: Before• Almost all accurate adjustment is
done to Greyscale images with the Levels tools
Adjusting Greyscale: After 1• Trim Dynamic Range and Contrast
Adjusting Greyscale: After 2• Trim Printer Dynamic Range (Output
levels)
Adjusting Greyscale: After 3• Curves can be used for greater
precision or special effects
Tones 1• Toned prints can be made from
Greyscale images converted back to Colour
• Then Overlay a Colour Layer and Blend
Tones 2• Alternatively, convert Greyscale to
Duotone and select ink colour and transfer function
• Use dark/dense inks
Duotones 1• Duotones (and others) do not create
extra channels
Duotones 2• Colours are mixed according to the
precise transfer functions created• Double click to edit function or
colour
Line Art and Liths 1• Good Line Art requires very high
resolution scans• Line Art should ideally only be Black
and White – no Greys• Convert to Bitmap
– very poor
Line Art and Liths 2• Add a Threshold Adjustment Layer
for much greater Control
Line Art and Liths 3• For more effects play with Blend
Modes and Opacity of Adjustment Layer
End of Black and White
Photographs courtesy of Janet Edwards