When should I "Convert" an element?
Nonstop Printing can only target either sRGB or Adobe RGB. So this would be helpful if you have an image tagged as something other than the target you select and want the colors to be as accurate as possible.
One example is if you are creating a document with the majority of the elements as sRGB (and you like the tonality/more muted colors of that range, but you have an element that is brighter and in Adobe RGB and you want to maintain that brightness as much as possible. In this case you would want to convert that image to sRGB to try to retain the brightness as much as possible.
How to "Covert" a ICC in Photoshop
Note: you can also do it from inDesign by right clicking on the link and clicking "Edit in Photoshop"
- Right click on the element you want to work on and click "Open In" and select photoshop.
- If you have "High Color Awareness" on then it may notify you that you have a profile mismatch like below. We typically select "Use the embedded profile" as a starting point. Then click OK.

- At the top go to "Edit" - "Convert to profile..." Once you select it, a dialogue should open up like below.

- Select the ICC you want (choose between sRGB or AdobeRGB for printing with Nonstop). Check the "Preivew" Box. Do you notice a change? It's counter-intuitive, but in most cases, the image shouldn't change much at all. This is because converting maintains the visual appearance as much as possible while adjusting the RGB/CMYK values.

- Click OK once you make your selection.

You're not quite finished! You need to export the image the correct way for the ICC profile to carry with the file.