Introduction

This application detects a specified colour on a PNG image and make that colour transparent. Often you received graphs with a white background and sometime you wish to make this transparent. A transparent image is necessary if you wish to overlay it on top of a background image. Note you can enter a colour as the hex code (eg white = #FFFFFF).  
     

Figure 1

 
     

Figure 2 (This is a transparent image though you can not tell)

 
     

Figure 3 (When opened a transparent image in PhotoShop etc you will see white and grey squares as the background)

 
     

Figure 4 (Here the plot is overlaid on top of a background image. You can do this with PhotoShop and R etc)