Learn about what the default settings in the Convert to Profile window should be; quick conversion to Lab and back to RGB; and the need to convert back to RGB for convention printing and viewing.
- [Instructor] The first time you convert an image from RGB color or CMYK color to Lab, it's important to use the Covert to Profile dialog box. This is found in Photoshop on the Edit menu, so you choose Edit, Convert to Profile. And the first thing to do is to choose Lab color from the profile list under Destination Space. So here I'm choosing Lab color. Next, make sure that your engine is Adobe, not Apple. That the intent is Relative Colorimetric under the Intent dropdown list. And make sure that the Use Black Point Compensation box is checked. The two other boxes that you are seeing grayed out don't matter. Click OK to close the image and convert the image to Lab. If you take a look now in the Channels palette, which I'm hovering my mouse over, you'll see that you now have the three Lab channels, the Lightness or L channel, A, and B. Once you get used to working the Lab, and after you've converted to Lab the first time using the Covert to Profile dialog, the good news is that there's a much faster way to convert images to the Lab color space. But it is important to emphasize that the first time you use Lab, you must use the Covert to Profile at least once to make sure that the correct settings are in place. So let me back up for a second using the History palette to go back to before I converted to profile, so there I am, I'm back in RGB. And now this time when I want to convert, I can simply go Image, Mode, Lab color like that. I don't have to go through the Covert to Profile dialog. So as I've mentioned all visits to the Lab color spaces are round trip. You come here, you visit, you do your work in Lab, and then you go back to where you started, probably RGB. When you're finished working on your image in Lab to round trip back to the working RGB color space, choose Image, Mode, RGB Color, and you'll go back into the RGB color space that is the default color space for your setup of Photoshop.
- Converting images to Lab Color space
- Applying Curves to Lab channels
- Selective sharpening
- Inverting channels
- Making per-channel equalizations
- Using the Lab action
- Combining Lab Color with blending modes
- Making patterns with Lab images