September '22

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G R A P H I C S - P R O. C O M S E P T E M B E R 2 0 2 2 • G R A P H I C S P R O 6 7 Recommended values in the RGB fields for the white point are 240R, 240G, 240B that produces a very light gray. The values in the RGB fields for the black point are 25R, 25G, 25B, which produces a very dark gray. 9 PICK YOUR METHOD Eliminating a colorcast is simple and requires only a few steps to improve color relationships. I've presented three different meth- ods to choose from depending on the image. If the image has no white or black point, then visually apply the color balance tech- nique. If there is only a white point, then use the lightest area as a marker to adjust the numbers to neutrality. Finally, if the image has a white point and black point, then you're in luck! e process is virtually automatic. I think you'll find that with these tech- niques even the most discolored images can be improved. By the way, if you want to give these techniques a try, you can download the images used in this article at GP When the light and dark extremes are adjusted using the WPBP method, all of the colors are remapped, and everything falls nicely into place. Stephen Romaniello is an artist and educator who has taught computer graphics since 1990. He's a certified instructor in Adobe Photoshop, Adobe Illustrator, and Adobe Pre- mier and the author of various works on the creative use of graphics software. Stephen is the founder and CEO of GlobalEye systems, a company that offers training and consulting in graphics software and creative imaging. 10

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