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Photoshop: File > New. Set Units to Inches. Width/Height = final size (e.g., 4 x 6). Resolution 300 ppi. Color Mode CMYK. Create.
- Illustrator: File > New. Choose the Print tab. Units: Inches. Width/Height = final size. Color Mode CMYK. Create. (Artboard = your final size.)
- InDesign: File > New > Document. Print tab. Units: Inches. Width/Height = final size. Uncheck Facing Pages for single pieces. Create.
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Affinity (Publisher/Designer/Photo): File > New. Choose a Print preset or type Width/Height = final size in inches. DPI 300. Color format CMYK for print. Create.
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Canva: Create a design > Custom size. Switch the unit dropdown from px to in (inches). Enter Width/Height = final size. Create new design. (Note: free Canva can't resize later — that tool is Pro-only — so get this right first.)
Understanding Bleed/Trim/Margin (ignore not including crop marks, we prefer crop marks included):
https://www.youtube.com/watch?v=A1Fo6ZRlarI
With Adobe Express:
https://www.youtube.com/watch?v=B0YtP-cbR5A
With Canva:
https://www.youtube.com/watch?v=FfecvTvpXGw
With Adobe Illustrator:
https://www.youtube.com/watch?v=jYlioByHNsc
With Adobe Photoshop:
https://www.youtube.com/watch?v=5D1kQlnfMok
With Adobe InDesign (we prefer single sheet spreads)
https://www.youtube.com/watch?v=bVj4pwIAesQ
Adobe Illustrator, InDesign, Acrobat - CMYK, Color Correction (Rich Black), Spot Colors, Text Outlines, Preflight, 300 DPI Images, Packaging
https://www.youtube.com/watch?v=qb51tgPZp2Q
How to setup a virtual printer on a Mac: