Converting between Grayscale and Bitmap modes (Photoshop)

Converting an image to Bitmap mode reduces the image to two colors, greatly simplifying the color information in the image and reducing its file size. To convert an image to Bitmap mode, you must first convert it to Grayscale mode. This removes the hue and saturation information from the pixels and leaves just the brightness values. However, because few editing options are available for Bitmap-mode images, it's usually best to edit the image in Grayscale mode and then convert it.

Keep in mind that a Bitmap-mode image edited in Grayscale mode may not look the same when converted back to Bitmap mode. For example, consider a pixel that is black in Bitmap mode and then edited to a shade of gray in Grayscale mode. If the gray value of the pixel is light enough, it will become white when converted back to Bitmap mode.

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