To prepare photographic positives for photoscreen and photolithography all digital images or photographs need to be converted to greyscale and printed in black ink only onto transparent film using an inkjet or laser printer. If an image contains greys it is better to darken them as they are likely to overexpose and not show up in the print.
Image sizes:Image resolution: 300ppi.
Plate sizes: A3 37x45cms allow 6cms border so height 39cms and constrain proportions. A4: 38×25.3cms
Use CMYK? 8bit. Convert to bitmap. Output 700dpi. Method Halftone screen OK. Frequency 47 lines/inch, angle 30 degrees, Shape round.
Drawing/sketching and cut-out styles for design
Coloured pencil/pastel effects
Photo as smart object
Refinement of photo using art filters eg find edge, blur, posterise, and/or colour/tone adjustments
Overlay blend watercolour paper and/or other textures in subtle colours with or with curve adjustments to enhance texture as top layer
Mask the photo and slowly reveal using stamps with different/rotated/opacity/blended watercolour brushes.
Colour/tone/saturation adjustments on final image.
Effect can be applied to multiple images through changing photo in smart object and adjusting filter refinements as needed.
Pop Art silkscreen effect
Mimics silkscreen process:
black and white simplification of photos flat/grayscale/halftone as in photoscreen
overlaying blocks of vivid flat colour. Imprecise, off-register and texturing for ink imperfections.
Uses levels for black and white. Then paint out different portions of the black and white image to separate layers. Then paint in colours.