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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