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Originally Posted by HILDA WOOD Michael thanks. Ive tried your pic and the face is great. The beard has come out a bit multi coloured . Otherwise great technique, so realistic.
Perhaps this is a daft question, but could you open up a solid colour layer of blue, one of green, yellow and red with blend mode set to colour and paint in the same way, or is there something special about working the image in Lab mode? |
In the case of colorizing a B&W, there are many advantages to working in LAB.
The A&B channels can stand a LOT of manipulation that other color modes simply can't handle. For example, one can use just about any filter on the A&B channels and never harm detail. One practical application is to soften transitions, a moderate amount of Gaussian Blur to the A&B is all it takes.
Another advantage is dealing with blown out highlights or plugged up shadows. In RGB, a color can't be both as white as possible and have color. White in RGB is 255r, 255g, 255b. As soon as you add color, the pixels get darker. This means that when colorizing in RGB, when a layer is set to the Color Blend Mode, you can't add color to white areas. This is not the case in LAB where you can ask Photoshop to give you a pixel that's as white as you can get (100L) and have color.
There are other advantages as well; channel blending, sharpening, and increasing color variation to name just a few.
I have a few more LAB colorizing tricks up my sleeve, but I'm going on vacation soon and won't be back until the beginning of October. I'll check back then and if you still have any questions I'll follow-up with some more tips.
Regards,
Michael