F.Y.I. picture operators were updated in v14

http://doc.4d.com/4Dv15/4D/15.4/Picture-Operators.300-3274678.en.html

> (*) The functioning of the exclusive superimposition (&) and inclusive 
> superimposition (|) operators is modified starting with 4Dv14 following the 
> update of the display management libraries used by the program.
> Pict3 := Pict1 & Pict2 produces the same result as:
>  COMBINE PICTURES(pict3;pict1;Superimposition;pict2)

but your problem might be related to the specification

> The picture operators return vectorial pictures if the two source pictures 
> are vectorial. Remember, however, that pictures printed by the display format 
> On Background are printed bitmapped.

alternatively you could explicitly replace the "white" pixels with 
"transparent".

http://doc.4d.com/4Dv15/4D/15.4/TRANSFORM-PICTURE.301-3274515.en.html

> 2017/10/19 22:56、Ronnie Teo via 4D_Tech <4d_tech@lists.4d.com> のメール:
>
> The problem is that now the white background of Picture2 also covers part of 
> Picture1 instead of being a clean transparent overlay.
> Can anyone advise how it’s possible to deal with the background issue when 
> combining 2 pictures with the new picture commands?




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