I know others here have looked at things like Ubuntu, so here's my setup.
Linux - modified by me but based on Ubuntu, Mint and Zorin. However, any of these alone will work.
Computer is whatever was cheapest on the day. Currently a compaq of some sort, pretty low spec, hooked up to 2 LCD screens.
Printers include
1 mono Brother HL2040 - pretty irrelevant here.
1 colour HP CP1215 - general office hack.
2 Brother MFC-J6520DW inkjets. One runs Epson compatible sublimation ink, the other runs Epson compatible pigment ink.
I do not use ICC profiles because most of my work is reproducing colour photographs.
Editing is initially done in GIMP. For my printer, setting Colour Balance initially to Cyan -15 Magenta -20 Yellow -15 (those are 'minus') gets colours close to reality for my ink, paper and printer.
I do a lot of my layout in Libre Office Draw because I have created templates with most of the images for say 20 mugs and the text I will use laid out around the edges. Think MS Publisher. For those of us who had WYSIWYG in DOS days, think Express Publisher. The thing MS more or less copied.
I simply drag the image and text into position and it is almost ready.
Clicking on an image brings up a box that allows me to tweak brightness, contrast and gamma, usually something like Bright = 20, Cont = 10 and Gamma = 0.6 is sufficient combined with preset CYM from GIMP.
I can also adjust Red Green and Blue ffrom this box, essentially over riding my previous settings.
Once I get a satisfactory print on the substrate I want, I save that template in a 'Production' folder with a title that lets me know what photos are on it.
It took me a while to work our how simple this can be, but now I know the basics, lack of ICC profiles is not an issue. And it is so much simpler to work in such a basic manner.
I hope this is some help to anyone else that has an interest in using Linux in their Dye Sub work. I know from searching that there is very little info our there, and in fact was told it can't be done easily.
I will post some mug shots when i have the time, but in the mean time, here's what I did in my first 2 weeks of experimenting with Heat Transfer and with Dye Sublimation.
http://www.rossdevitt.com/whitsundays/shirts/
It's not very exciting, but it was the first time I tried either type of printing. You can easily tell which are Dye Sub and which are Heat Transfer.
I am still wearing and washing the shirts sublimated 'into' 100% cotton, but it is not really a retail option. I simply do it because I like wearing cotton that has no hand at all. The odd thing is that the saturated sub method outlasts JetProSS.
Ok, hope that helps someone.
Cheers,
RossD and Jo.