[Implemented] Function RGBA() and Alpha()

thyphoon · Post by **thyphoon** » Wed Jul 16, 2008 7:35 am

Hello,

I see lot off topic about alpha, but no ask why don't add this function
to works with 32bit image
Color = RGBA(Red, Green, Blue, Alpha)
Result= Alpha(Color)

support for 32bit image with Color= Point(x, y) and Plot(x, y,color)

Best regards and excuse me for my bad english

Thy

DoubleDutch · Post by **DoubleDutch** » Wed Jul 16, 2008 12:22 pm

The alpha could be tagged onto the end of the existing function - 0 being default?

eg

Code: Select all

x=RGB(r,g,b[,a])

Post by **Polo** » Wed Jul 16, 2008 4:12 pm

DoubleDutch wrote:The alpha could be tagged onto the end of the existing function - 0 being default?

eg
Code: Select all
x=RGB(r,g,b[,a])

Well, 255 as default sound better

DoubleDutch · Post by **DoubleDutch** » Wed Jul 16, 2008 4:43 pm

I thought that 0 was "not transparent"?

Foz · Post by **Foz** » Wed Jul 16, 2008 4:47 pm

Just as 0,0,0 means no colour, 255,255,255 means all colours

Think of it like a percentage, except it ranges upto 255 rather than 100.

DoubleDutch · Post by **DoubleDutch** » Wed Jul 16, 2008 4:53 pm

ahh, I thought that zero was a special case for compatibility?

Post by **Polo** » Wed Jul 16, 2008 5:19 pm

0 means it's transparent, and 255 means it's opaque

DoubleDutch · Post by **DoubleDutch** » Wed Jul 16, 2008 5:37 pm

ic, so for existing PureBasic compatibility it should default to 0, but ideally it should be 255 (RGB($ff,$ff,$ff) currently generates $00ffffff, not $ffffffff).