First you have to Inverse the picture and then apply the colorize.
On Photoshop fr example:
1. Control + I to inverse
2. Image->Hue/Saturation
2a. Click on Colorize
2b. Set Hue to 220
2c. Set Saturation to 100
2d. Click OK.
Now you have from Green a White dots on Blue background.
Ioannis




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