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Re: problem with IKImageView and filters
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Re: problem with IKImageView and filters


  • Subject: Re: problem with IKImageView and filters
  • From: "douglas a. welton" <email@hidden>
  • Date: Tue, 8 Jul 2008 15:12:10 -0400

Hi Hamish,

Am I reading correctly that you have two IKImageViews stacked on top on one another?

Is there a reason that you aren't using Core Image and using one of the compositing filters to produce a "difference" that you can then display?

do the items you are currently displaying in the two IKImageViews need to be moved (dynamically , by the user?) in relation to one another?

curiously,

douglas

On Jul 8, 2008, at 12:33 PM, hsanderson wrote:

Hi all,

I am trying to write a basic image diff-ing tool consisting of two overlaid IKImageViews, with the topmost view having a Difference Blend Mode compositing filter applied to it in IB's Effects palette. So far so good... until I call -setImageWithURL: to put images into these views, at which point the images appear (yay!) and the filter effects disappear (!yay).

I've tried the same thing with other background and compositing filters just to check, and in each case the applied effects can be seen on an empty IKImageView but vanish as soon as I call - setImageWithURL:.

Any ideas, advice, etc? I'm new to IKImageView/CoreImage/etc. so am not sure if I'm doing something wrong/stupid in my code, or if it's the Leopard APIs that are playing up.

Thanks,

Hamish
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