RGB Printing vs. CMYK Printing

[DAK13]

Heya all - 

My images are created using RGB color. Some products only print with CMYK color and there is a considerable difference in colors when an RGB image is transferred to a CMYK image for printing.

Do I need to prepare my images as CMYK for CMYK specific products before uploading them to Zazzle?

Also is there a list of which products print in CMYK?
And if not, where is the CMYK printing notice for each product when creating a new item?

Thank you!

[KeegansCreation]

No, Zazzle requests that all images be RGB.

[idraw]

Working from memory about a very old post in the old )gone) forum, a Mod stated that Zazzle converts the image to their inhouse profile printing format. So you don't have to do anything other than save your file as rgb and upload it, Zazzle will handle it from there, and will let you know if there is ever a problem, theoretically.
Further, RGB has a much larger color "window" than CMYK, in cmyk some of the colors, such as teal, lose their vibrancy.
Zazzle's conversion handles things well,using RGB. Best to let the Mods chime in with specific answers. (probably too late today for Mods to reply, won't happen till Monday,) I have been using the Adobe RGB profile in Photoshop for many years, earller at Cafe"extremely"Pressed and now other PDDs, along with Z, still using with no problems on my  Mac. For many years before that (1994) I used BruceRGB, which was a beautiful profile.

Zazzle Help Center > Orders > Design Tips  DESKTOP MOBILE Suggested Color Profiles We recommend using an RGB color profile for images; however, we also support CMYK based images. A Note About Using Images with the Color White In an image, there are areas that you may want to be transparent (i.e. the area or background behind it shows through) or areas that you may want to be non-transparent.

[DAK13]

Thanks for the info, idraw : )

[DAK13]

So I only need to upload my files as RGB and let the Zazzle team deal with correcting any problems with CMYK printed products?
iDraw suggested a Moderator could decide this issue?

Thanks!