adobe photoshop - Should I work in CMYK when printing shirts using Direct-to-Garment (DTG)?

I've just read What kind of black should I use when designing for CMYK print? and I'd like to ask if these considerations for a "nice" black when printing on fabric using a direct to garment (DTG) process.

Some printers ask for the designs to be in RGB colour mode, so does that mean I should primarily stick with RGB colours directly instead of having PS or Illustrator convert from CMYK to RGB?

There are also references like this one but I thought I would ask from some more designers for details, as I may be doing some print in the future as well.

Also, if you have the same design going for print, web, and fabric, do you have separate source files having the specific colour profiles?

Answer

Direct to garment is a digital print. If you do not have the specific CMYK profiles it is recomended that you send the file in RGB with R0G0B0 values as black.

A lot of people think that a CMYK output is a must when sending to print. It is not. Sometimes you need to avoid it.

It is a must when sending it to a CMYK separation, like offset print or color selection silk print.

But on a digital output (unless you have total control on the rip) you need the rip decide the separation of colors. Some printers can use 6 inks, some use diferent color profiles, some will have some built in tweeks to make your print "pop", etc.

If you have the same design going for print, web, and fabric, do you have separate source files having the specific colour profiles?

Interesting one. Yes.

You should understand what a color profile is.

It is a series of "matrixes" to adjust colors depending on the conditions, to be printed or viewed. Ink types, brands and surface to be printed.

Coated paper, office paper, newspaper, cotton fabric, sinthetic fabric, silk print, offset print, sublimation, inkjet print. Japaneese inks, german inks, north american inks. Transparent inks, opaque inks. 6 color separations... a big etc.

So the answer is yes at some extent.

At least you need a sRGB rgb profile for web, or drop the profile completly. The CMYK profile is only to see the colors somehow similar to a print, but on an RGB file is not stored.

On a digital oputput you could use either Adobe 1998, ProPhoto RGB or sRGB.

On a real CMYK output you need at least a standard profile depending on your region and basic paper type. (Swop, Gracol, Fogra, Japan Standard)