Normally, these three images are combined to display the composite color image. Software in your camera generates a full resolution image for each of these primary colors. Selecting a Single Channel to ConvertĮach pixel on your sensor can see the world through either a red, green or blue filter. This Grayscale conversion has a dark sky, well lit pavement, good mid-tones and strong shadows. It also has strong leading lines and textures that work well in black-and-white. In this example, the colors are well differentiated. If you want to save your Grayscale image as a JPEG, Photoshop will automatically reinstate three identical red, green and blue channels.Ī simple Grayscale conversion can give good results if the subject matter has a strong composition. It will discard the color information and switch to Grayscale mode. If you click the ‘Discard’ button, Photoshop will apply the fixed conversion. Photoshop will warn you that you’re about to discard color channels and suggest a better method that gives you more control. The Grayscale conversion is approximately 0.28r + 0,7g + 0.06b. Then, with the duplicate image open, select Image > Mode > Grayscale. This is a destructive conversion, so work on a copy of your color image by selecting Image > Duplicate… from the main menu. It then sums these modified values to obtain the final grey value. The grayscale conversion models this by multiplying the red value by 0.28, the green value by 0.7 and the blue value by 0.06. Our eyes are most sensitive to green, less sensitive to red and least sensitive to blue. This conversion models the way the human eye perceives the brightness in a scene. And although it’s quick and simple, it can give surprisingly good results. It’s not the best way to make a black-and-white image but it’s not the worst either. Switching to this mode necessarily removes the color from a photo. Images in this mode have no red, green or blue channels but instead store only the brightness (luminance) information in a single channel. It’s designed to handle images with no color information. Photoshop supports a special mode called ‘Grayscale’. Thus, the pixel is forced to a shade of grey. This calculates just one number that’s then applied to all color components. You enter the values from the red, green and blue components of each pixel into a formula. Whatever method you use, the process is essentially the same. Photoshop provides many different ways to convert a color image into a black-and-white one. How to Edit Black and White Photos in Photoshop In this tutorial, we’ll show you how to use Photoshop to edit black and white photos. Editing black and white photos can be a great way to improve the quality of your images, and Photoshop is one of the best tools for the job.
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