Digital Grin > 1. Convert to LAB
The figure shows how to do this.  Click on the Image menu, then the Mode submenu, and finally on the Lab Color item.
Digital Grin > I chose to have it save the files in the same location. In this case the Image Processor made a new folder "JPEG" and put all the copies of the images in there. Now they're all JPEG5 and 400x267.

Easy Peasy.
Digital Grin > When you click on Select Folder a standard dialog comes up. You can only select folders of images in this box, not individual files.
Digital Grin > By David Rosenthal.Photoshop CS2 has a very handy tool that many don't know about. It's the Image Processor, and it can be found in File>Scripts>Image Processor.

As you can see, it offers you several options, and nothing's easier for converting image types, resolutions, colorspaces, or running actions.

In this case I am batch changing the JPEG quality to 5 and resizing to 400x267.
1. Convert to LAB
The figure shows how to do this. Click on the Image menu, then the Mode submenu, and finally on the Lab Color item.
Digital Grin > 1. Convert to LAB
The figure shows how to do this.  Click on the Image menu, then the Mode submenu, and finally on the Lab Color item.
1. Convert to LAB
The figure shows how to do this. Click on the Image menu, then the Mode submenu, and finally on the Lab Color item.
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