[REBOL] Re: Alpha channel of image! type
From: petr:krenzelok:trz:cz at: 15-Nov-2002 4:48
Claude Precourt wrote:
>Hmmm. That's not what I get at all. The following example session shows that
>each pixels is, in fact, stored in 32 bits (test.png does have an alpha
>channel):
>
>>>img: load %test.png
>>>== make image! [89x133 #{
>>>
>>>
>466DB1476EB24970B44B72B64C73B64C73B74B72B64B72B64970B44A71B5
>4B72B64B72B54970B44970B34A71B44B72B64D71BD4C...
>
>>>first img
>>>
>>>
>== 177.109.70
>
>>>second img
>>>
>>>
>== 109.70.0
>
>>>third img
>>>
>>>
>== 70.0.178
>
>You can see that, using first, second and third,
>
So why don't you refer to my examples? ;-)
> I can scroll through the
>image's data one byte at a time, and that the fourth element is the fourth
>byte of the pixel. So far so good. But then things start to get weird.
>First, the value should be 255, as the alpha channel is white in the image,
>and second, I don't have access to the fourth component of the pixel:
>
Go and download 1.2.8 version of View ....
-pekr-
