Why am I getting these white outlines when colour separating?

[skol_will]

Hi guys, I'm new to colour seperating for print, and was just wondering id anyone could help me identify why I'm getting these white lines around each colour selection? I've tried playing with the 'expand' and 'contract' modifiers in the selection menu, but to no avail. I've attached an image of what I mean. Thanks!

[Mylenium]

Well, color separating an RGB document is not going to be productive to begin with. You need to convert to a print color space (CMYK/Multichannel) and then check overprint and other settings. You may want to educate yourself a bit about some basics. If whoever is printing this wants this in RGB, then you may be wasting your time with unnecessary steps. Color separations often mean nothing for these workflows as e.g. short-run inkjet printing will simply rely on driver settings and the facilities color profiles.

Mylenium

[skol_will]

Thank you for the reply!

If you have a step by step guide you could link me to that would be great!

[Francesco Della Peruta]

To convert to other color modes:

https://helpx.adobe.com/it/photoshop/using/converting-color-modes.html

[Francesco Della Peruta]

About spot colour and overprint:

https://helpx.adobe.com/photoshop/using/printing-spot-colors.html