Re: convert NSBitmapImageRep to black/white depending on pixel hsb
Re: convert NSBitmapImageRep to black/white depending on pixel hsb
- Subject: Re: convert NSBitmapImageRep to black/white depending on pixel hsb
- From: "Shawn Erickson" <email@hidden>
- Date: Fri, 10 Aug 2007 16:48:48 -0700
On 8/10/07, email@hidden <email@hidden> wrote:
> Hello
>
> I have a coloured NSImage/NSBitmapImageRep and want to make it black
> and white, note not gray scale.
> It should also be based on the brightness of the pixels.
>
> + (NSBitmapImage *) getBlackWhiteImage:(NSBitmapImage*)image
> brightness:(float) value;
>
> Example all pixels that have a brightness > 0.9 shall be NSColor
> whiteColor other pixels shall be NSColor blackColor.
>
> I have tried to loop all pixels one by one and set them, however this
> really took minutes on a 500x500 image.
>
> There are so many approaches to take. Please could somebody suggest a
> faster strategy?
Core Image
-Shawn
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