Try this:
Create your action
- Open Photoshop and create a new document in CMYK colour mode (any size).
- Open the Actions panel.
- Click the
Create new action
button. Give your action a name ('CMYK > RGB') and click Record
.
- Now, with your action recording, change the image's colour mode (
Image > Mode > CMYK Color
).
- On the Actions panel, click the
Stop playing/recording
button.
Your action is now saved in the Actions panel.
Create your Droplet
- Click
File > Automate > Create Droplet
.
- Set up your Droplet:
- Under
Save Droplet In
select a folder to create the Droplet in and give it a name. You may want to create a 'Droplets' folder on your desktop.
- Under
Play
select the set you created your action in, and your action.
- And under
Destination
select Folder
. For this, you may want to make an 'Exports' folder inside your Droplets folder.
- Click
Choose
and select the folder where you'd like the new RGB version of your image to be saved.
- You can specify extra options here, such as file naming conventions and the link, but I'll just stick to the basics.
- Click
Ok
.
A Droplet is now saved in the folder you specified.
Using the Droplet
To use the Droplet, simply drag your CMYK image onto the Droplet icon in your Droplets folder, and an RGB version if the image will be created in the Exports folder.
If you want your action to export an image at a specific resolution, size or quality, you can record these steps as part of your action.