Photoshop SIG |
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| creativepro.com - Photoshop Tips: Duotone vs. Multichannel Images | |
| The Luminous Landscape - Duotones in Photoshop | |
| Creating Duotones for Printing and Web Pages by Carl Volk | |
| graphic-design.com - Duotones - Duotones for presses with some info on Photoshop | |