How to change color profile

[vpoms]

I have a number of JPEGs in grey color profile. This is how the images are saved (the images are digital x-rays). I would like to annotate the images and I use Preview for that. When I save the annotated images the color of the text reverts to grey since image color profile is grey. I need to change them to RGB profile. How can I do that using iphoto or any other software that came with my MacBook Pro?
During my one to one session, my trainer suggested importing image into the Keynote, saving it and then exporting it. It comes out with an RGB profile, however, I need to do this with tens and sometimes hundreds of images (x-rays) and importing each one into keynote is not very efficient. Is there a way to batch converting them from grayscale to RGB?

Thank you for your suggestions.

 

[Ruahrc]

If you're going to be working with large quantities of images, it's time to get the right tool for the job. A proper image manipulation program like photoshop can batch process many images in one go, and can for sure do what you need. There are also some free or cheaper alternatives you could try. The GIMP might be able to do it, I'm pretty sure imageJ can, also I am not sure if Photoshop elements can do batch processing but I have done similar things with graphicconverter.

Ruahrc

 

[timbos]

I have a number of JPEGs in grey color profile.
...
, I need to do this with tens and sometimes hundreds of images (x-rays) and importing each one into keynote is not very efficient. Is there a way to batch converting them from grayscale to RGB?
.

Whenever I see something where I need to repeat the same action multiple times, I always take a quick trip to Automator.

I just made a quick workflow with 3 actions:
1) Ask for Finder items
2) Copy Finder items (so you don't screw up the originals)
3) Apply ColorSync Profile to Images (I set it to use my calibrated Colorsync profile, but a generic RGB one would work)

I ran this workflow on a couple of greyscale images, and the result is an RGB image.

Hope this helps,
Tim

 

[Ruahrc]

3) Apply ColorSync Profile to Images (I set it to use my calibrated Colorsync profile, but a generic RGB one would work)

This is a little OT but fi you're applying a monitor-specific profile to an image, you're not doing it correctly. Monitor specific ICC profiles should only be used in system prefs>displays for your screen, and never for an image.

Ruahrc