An image doesn't carry a blend mode, merely the image data. You *draw* the
image in a given blend mode.
Bob
On Fri, Jan 22, 2010 at 3:52 PM, Eric E. Dolecki <edole...@gmail.com> wrote:
> I'm not combining two or more images, I merely would like a single uiimage
> in a uiimageview to have a blend mode applied to it that works so that no
> matter what is beneath it, there will be a blend mode applied.
>
> Is this not possible?
>
>
> On Fri, Jan 22, 2010 at 10:43 AM, Bertil Holmberg
> <bertilholmb...@telia.com>wrote:
>
> > Here is a snippet that I saved for another day, perhaps it will get you
> > going?
> >
> > Regards,
> > Bertil
> >
> > - (UIImage *)blendOverlay:(UIImage *)topImage withBaseImage:(UIImage
> > *)baseImage toSize:(CGFloat)imageSize
> > {
> > UIGraphicsBeginImageContext(CGSizeMake(imageSize, imageSize));
> > [baseImage drawInRect:CGRectMake(0.0, 0.0, imageSize, imageSize)];
> > [topImage drawInRect:CGRectMake(0.0, 0.0, imageSize, imageSize)
> > blendMode:kCGBlendModeNormal alpha:0.5];
> > UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
> > UIGraphicsEndImageContext();
> >
> > return image;
> > }
> >
> > > Okay, how would I go about doing that?
> > >
> > > On Fri, Jan 22, 2010 at 9:52 AM, Luke the Hiesterman <
> luket...@apple.com
> > >wrote:
> > >
> > >> You should perform whatever blending you need to do on the image
> itself
> > to
> > >> create a new image which you can then just put into a UIImageView like
> > you
> > >> would any other image. This way, you only have to blend once, and then
> > it's
> > >> just image that can be straight drawn rather than performing a
> blending
> > >> algorithm every time your image has to draw.
> > >
> >
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>
>
> --
> http://ericd.net
> Interactive design and development
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