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Re: Create CGImageRef with transparency
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Re: Create CGImageRef with transparency


  • Subject: Re: Create CGImageRef with transparency
  • From: "Christian Giordano" <email@hidden>
  • Date: Sun, 5 Oct 2008 19:15:16 +0100

Yep, that worked perfectly, thanks a lot!


chr



On Sun, Oct 5, 2008 at 6:45 PM, Adam R. Maxwell <email@hidden> wrote:
>
> On Oct 5, 2008, at 10:28 AM, Christian Giordano wrote:
>
>> I'm trying to create a CGImageRef with CGImageCreate from a generated
>> byte array (RGBA) but it doesn't seem to handle the transparency, so
>> all the pixels are visible when some should not. As color space I'm
>> using CGColorSpaceCreateDeviceRGB(), as CGColorRenderingIntent I'm
>> using kCGRenderingIntentDefault and as bitmap info
>> kCGBitmapByteOrderDefault, any idea if it is possible and what I'm
>> doing wrong?
>
> I think your bitmap info should include kCGImageAlphaLast, and be careful of
> the byte order.  David Duncan gave a good explanation of those flags here:
>
> http://lists.apple.com/archives/carbon-dev/2006/Nov/msg00014.html
>
> --
> adam
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References: 
 >Create CGImageRef with transparency (From: "Christian Giordano" <email@hidden>)
 >Re: Create CGImageRef with transparency (From: "Adam R. Maxwell" <email@hidden>)

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