How to remove color from a picture

Quick answer：

To remove color from a picture, you can use various image editing software or applications. In programs like Adobe Photoshop, you can use the Desaturation feature under the Adjustments menu. Alternatively, you can convert the image to grayscale by selecting 'Image > Mode > Grayscale' in Photoshop. Other software like GIMP or free online tools also offer similar functionalities.