Editing Test Card F (section)

===Colour===
Bubbles's original body colour was [[blue]] and [[white]], but the BBC engineers decided that [[green]] was also needed within the scene<ref name=murphy>{{cite web|last=Grant|first=Dave|title=Test Card 'F'|url=http://www.murphy-radio.co.uk/gallery/tcf/bbc_tcf.html|work=The Test Card Gallery|access-date=10 June 2013}}</ref> as the other two television [[Primary colour#Additive primaries|primary colours]], [[red]] and [[blue]], were already shown. A green wrap was made to cover his body and this can be seen in Test Card J and Test Card W, along with more of his body shown in the photograph<ref name=meldrum>{{cite web|last=Meldrum|first=Darren|title=BBC Test Cards|url=http://www.meldrum.co.uk/mhp/testcard/bbc_test.html|work=MHP The Test Card Gallery|access-date=10 June 2013}}</ref> — revealing the fact that he is actually holding a piece of [[chalk]], which was not previously visible.

However, the shade of green material chosen was too subtle for the engineers' liking and so Bubbles' body colour in Test Card F was [[Image editing|retouched]] (this can be seen from the edges of his image) to make it more [[Saturation (color theory)|saturated]] and also to give it a higher [[luminance]] value on screen.<ref name=murphy/>