setalpha() ??

[Romeo]

I'am testing the testimg.prg and found a SetAlpha() function, but i dont know how to use it.

any help about this function ?

tks

[ukoenig]

Romeo ,

a Alphablended Image is needed, in case You want to show a SHADOW
To show a simple background transparent, You can use a normal color
SetAlpha( .F. ) shows the transparent-area of a ALPHAblended image as a BLACK color
I don't know any reason to use it.
But You can use something like :
if IsAlpha( aTemp[ n ][ 1 ] )
to detect, if a image includes a alpha-channel



Very useful to download PIXELFORMER

Some links
viewtopic.php?f=3&t=23687&p=127412#p127412
viewtopic.php?f=3&t=17288&p=89855&hilit=pixelformer#p89855

A alphablended image ( BMP or PNG ) is used to show a shadow and a transparent level of a color ( yellow ).



A non alphablended image uses the background-color to be transparent.



best regards
Uwe

[Romeo]

many many tks
R

[Antonio Linares]

Uwe,

many thanks