Hello,
What value would have #414141 as #AARRGGBB and what about #52b531? How can I convert this using PHP?
Regards,
Pentium10
+5
A:
AA is the Alpha channel, and a straight conversion would be to set AA to FF to make it full opaque:
#414141 becomes #FF414141
(Just to add: In some implementations it means the amount of Transparency where 00 means complete opaque and FF means fully transparent. In that case, #00414141 would be correct. But I think that is the exception)
Michael Stum
2010-02-04 21:36:18
actually just tied and #00414141 doesn't display, it might be invalid
Pentium10
2010-02-04 22:08:06
I've always seen 0 alpha to be completely opaque. Also, doesn't the alpha value range from 0 to 127? 0xFF is 255.
Alix Axel
2010-02-04 22:12:55
@Alix depends on the tool. I have never seen a range from 0 to 127 though, where I used it (ImageMagick in PHP or GDI+ in .net) it was always 0 to 255, or in DirectX Development I sometimes saw a floating point range between 0.0 and 1.0. And as said, I saw implementations where 0 meant "fully opaque" and I saw some where 0 meant "fully transparent"... But if RGB ranges from 0 to 255 each, A usually follows.
Michael Stum
2010-02-04 22:39:58
See http://php.net/manual/en/function.imagecolorallocatealpha.php for the 0-127 alpha range.
Alix Axel
2010-02-05 02:03:36