No warning to mix screen 0 and screen graphic commands!

[DSMan195276]

If this is true I can try to set alpha channel the instant before using _putimage and ths must garantee me to get a half transparent image copied. But this code demonstrates that it is not so.
No changements if I set before o after PRINT on S2.

Ah, there's one more catch that I missed - the color provided to _SetAlpha also has its own alpha value which must match the existing value. IE. You're using 0 as the color, which is black with an alpha 0. Since none of the black pixels currently have an alpha 0 your _SetAlpha command doesn't end up doing anything. What you really want is this:

Code: (Select All)

_SetAlpha 100, _RGBA32(0, 0, 0, 0) TO _RGBA32(0, 0, 0, 255), S2

That modifies all pixels with a color within that range, which covers all black pixels regardless of the alpha value.