On Sep 23, 2009, at 6:25 AM, Roland King wrote:
One question about Transparency Layers, the docs say that when you
start one the global alpha is set to 1, shadows are turned off and
blend mode is set normal (actually only the Quartz 2D guide says
that the blend mode changes, the actual API
On Sep 22, 2009, at 9:42 AM, Roland King wrote:
Thanks David .. I'm a little confused by this though. The
documentation for masks doesn't really tell you where alpha fits in
to the overall 'mask value',
When you use an image as a mask, the alpha *is* the mask value. 1.0
means full passthr
Thank you Ken, and for the transparency layer hint too, I wouldn't
have thought of that.
I missed a whole load of blend modes not realizing that the Quartz 2D
Programming Guide didn't list them all, it stops at luminosity, my bad
there for not checking out the actual class docs and finding
Thanks David .. I'm a little confused by this though. The
documentation for masks doesn't really tell you where alpha fits in to
the overall 'mask value', in fact they don't really say how a general
RGB value maps to 0->1.0. They talk totally about color as in RGB
(1,1,1) maps to 1 and RGB(0
On Tue, Sep 22, 2009 at 9:20 AM, David Duncan wrote:
> On Sep 21, 2009, at 9:32 PM, Roland King wrote:
>
> I'm trying to construct an image which is colored according to the alpha
>> value of a different image. I've been hunting around the Quartz Core docs
>> and I can't figure out a good way to
On Sep 21, 2009, at 9:32 PM, Roland King wrote:
I'm trying to construct an image which is colored according to the
alpha value of a different image. I've been hunting around the
Quartz Core docs and I can't figure out a good way to do this. The
motivation is to do something similar to what
On 22 Sep 2009, at 06:18, Roland King wrote:
I hadn't seen CIFilter, no, that might have been a good avenue to
explore however I think that's not available on the phone (and this
is for the phone even though I didn't explicitly state that earlier,
apologies). So I'll have to use something a
I hadn't seen CIFilter, no, that might have been a good avenue to
explore however I think that's not available on the phone (and this is
for the phone even though I didn't explicitly state that earlier,
apologies). So I'll have to use something a bit more primitive.
I think perhaps a bitmap co
Modifying the bitmap data yourself shouldn't be too difficult, for an
NSBitmapImageRep you'd just grab the data with the -bitmapData method.
But have you checked out CIFilter? I'm not entirely sure I understood
what your goal is but there's likely a filter in place already that
will do it for you:
I'm trying to construct an image which is colored according to the alpha
value of a different image. I've been hunting around the Quartz Core
docs and I can't figure out a good way to do this. The motivation is to
do something similar to what apple does on the iphone tabbar items which
are draw
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