How can I increase the contrast in a color image converted to grayscale?

The original image is:

Original color image

And the black white version becomes:

Converted to grayscale

As you can see, the cyan colored cells disappear in the black & white version. How can I modify the original image so that the contrast is maintained in the black and white version?


After decomposing a coloured image to it’s RGB colors we often find a resulting gray-scale that suits our needs better that a gray scale based on brightness values alone:

Red: enter image description here

Green: enter image description here

Blue: enter image description here
With Gimp this can be done using Colors > Components > Decompose….

Source : Link , Question Author : Gigili , Answer Author : Takkat

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