Re: Remove alpha channel from uiimage
Re: Remove alpha channel from uiimage
- Subject: Re: Remove alpha channel from uiimage
- From: Peng Gu <email@hidden>
- Date: Tue, 28 Jan 2014 16:23:15 -0500
Thanks, It works. Seems it uses ARGB instead of RGBA. I used
*kCGImageAlphaNoneSkipLast,* which consumes more memory and all the images
are colored as copied images.
Thank you
Peng
On Tue, Jan 28, 2014 at 4:10 PM, David Duncan <email@hidden>wrote:
>
> On Jan 28, 2014, at 12:37 PM, Peng Gu <email@hidden> wrote:
>
> kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little
>
>
> You just asked Core Graphics to make a context with alpha, and thus an
> image with alpha. Core Animation doesn’t enumerate all the pixels of the
> image to determine if there is alpha, it just looks at the image flags.
>
> If you don’t want alpha, use kCGImageAlphaNoneSkipFirst instead.
> --
> David Duncan
>
>
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