Since pure green is lighter than pure red and pure blue, it has a higher weight. Notice that the colors are not weighted equally. The grayscale weighted average, x, is given by the formula Suppose the RGB value of a color is (r, g, b), where r, g, and b are integers between 0 and 255. To convert a non-neutral color to its equivalent grayscale value, you must compute a weighted average of the red, green, and blue values. The higher the numbers, the lighter the gray. The RGB encoding of any gray values is a set of three equal numbers, i.e., (x, x, x), where x is some integer between 0 and 255. Grayscale images are rendered in black, white, and all the shades of gray in between. The range of the three numbers is 0 to 255. In all RGB encodings, the first value is the amount of red, the second value is the amount of green, and the last value represents the amount of blue.
Pure red, green, and blue look like this: If you want to discard only the Edit settings, select File | Restore to Developed.On a computer monitor, cell phone screen, or digital camera screen, different colors are displayed by varying the amounts of red, green, and blue light that shines through the pixels. If you saved your changes, you cannot reset your settings. You can use the Gradient Tool to transition this effect across specific areas of your image.Ĭlick Reset to clear your changes and reset to default settings. You can use the Edit Brush to paint this effect onto specific areas of your image.
The area of red in the picture is brightened or darkened more than other areas. The more red there is in a pixel, the more effect the red slider has on that pixel.
In Edit mode, in the Color group, click Convert to Black & White.You can save your settings as a preset for future use. This helps to gauge the effect of each slider on the image. If you hover your mouse over each slider and watch the effect on the small preview, it shows you which parts of the image will be affected by each channel. Use the Convert to Black and White tool to emphasize different areas or aspects of a photo, as well as alter its mood and tone. You can create rich grayscale images when you can control the brightness of the red, green, and blue channels, as well as the overall brightness. You are here: Edit Mode > Adjusting Color Tools > Creating a Grayscale Image Creating a Grayscale Image