Hello Mr Frog.
I happened to be sitting here on my own Lilly pad thinking....one day, I'm gonna be out in your area and I'd really like to pop in and surprise you.
That would be fun shootn the breeze.
Profiles happen to be my friends. I create my own art with a specific profile (for my own use). Also, it helps if you know what your end target is for. Generally speaking, profiles are created and provide the option to be kept or discarded.
1st let me say, yes. Jpgs do strip out the profiles. Thats because basically, a jpg is really only intended for monitor viewing and not a format to be printed from (while intending to maintain color consistency). With that said, you can still maintain much high quality integrity of the art by going into photoshop and saving the file as a Jpg through (save as). You can keep the res high and maintain better quality.
The other method of (save for web) via Photoshop strips out far more image quality...intending to make it smaller and used on a web site or email.
Any time you switch to a jpg format, you strip out it's previous profile, but to tale that further, profiles are saved for modes and not formats. In other words, the profile warning correlates to your RGB or CMYK image modes profiles. Not your tif, jpg, psd or ai format.
When you create art in rgb in Photoshop, and save as RGB, it will open up again without that notice. If later on, you switch to CMYK in you mode, it still will not pop up again unless you then change your profile to a different profile for whatever reason. If you open the file up later, in Photoshop it will then give you that same window.
Profiles are used for various reasons and probably a different reason for each different person.
Profiles enable you to compensate for different substrates, different output methods or devises or even environments.
For example, if you are printing to paper, you might want to have a specific profile for that. If separating art like myself, I have a unique profile just for screen printing...and many more working that group...depending on what I need to do with that art.
Your current RGB profile comes standard in Photoshop and is geared towards offset or digital printing, it's set up for viewing on s monitor. CMYK is set up standard for your basic run of the mill offset press.
In the end, if you are only converting files for your own approval, then it doesn't matter all that much. If it's Yo match a very picky customers art file from what they saw on screen, then much research is needed in color calibration from monitor, paper print to press.
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