my grass did not change to white
instead of the whole image became white
Hi Siew,
I think you may have missed clicking the use alpha channel in the video on the operations panel (N key)
If you rewatch the video i am sure you will see the options checked there 
Hope this helps
Marc
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thank you very much Marc.
Too many info need to remember
cant even remember which lecture mentioned about this
but I remember about "to check the alpha in properties"
I already solved this problem, thanks again
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That, Sir… is the correct answer! Thanks, I was asking myself the same question!
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