# Color image to black and white converter

Image to Black & white converter converts your color pixel images to grayscale where it changed from a colorful image to a black & white image. You just have to open and upload photo you wanna change and press the convert button. This converter changes images maintaining a high quality and pixel resolution of images.

RGB to grayscale image conversion online:

1. Press Open PNG image button to load image from local disk.
2. Press Save to JPG button to save image to local disk.
 Original image: Converted image:

## How to convert RGB to grayscale

Gray RGB color code has equal red,green and blue values:

R = G = B

For each image pixel with red, green and blue values of (R,G,B):

R' = G' = B' = (R+G+B) / 3 = 0.333R + 0.333G + 0.333B

This formula can be changed with different weights for each R/G/B value.

R' = G' = B' = 0.2126R + 0.7152G + 0.0722B

Or

R' = G' = B'  = 0.299R + 0.587G + 0.114B

#### Example

Pixel with RGB values of (30,128,255)

The red level R=30.

The green level G=128.

The blue level B=255.

R' = G' = B' = (R+G+B) / 3 = (30+128+255) / 3 = 138

so the pixel will get RGB values of:

(138,138,138)

### How Coloured images are changed to Black & White?

Colourful images are actually the combination of three basic coloured pixels which are Red, Green & Blue(RGB). The different coloured images have different RGB values depending on the number of respective colours. While the grayscale ( black & white ) images have an equal amount and RGB score of each basic colour.

For example, if a cloured picture has 40 pixels red, 50 pixels green and 60 pixels blue colours then this converter will add pixels of all three colours and divide it by 3 to get the mean value that is 50. Now, this converter will convert and distribute an equal RGB score of 50 for each colour to get a Grayscale i.e Black & White image.

How can I turn a photo into Black?

Change a picture to grayscale or to black-and-white
1. Right-click the picture that you want to change, and then click Format Picture on the shortcut menu.
2. Click the Picture tab.
3. Under Image control, in the Color list, click Grayscale or Black and White.