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: Michael Watson <email@hidden>
- Date: Fri, 10 Aug 2007 21:33:33 -0400
As Shawn said, Core Image has this functionality built-in, and it's
quite fast. But I'm puzzeld as to why it took you "minutes" to scan
the pixels of such a small bitmap and perform this transformation.
What, exactly, does your code look like?
--
m-s
On 10 Aug, 2007, at 19:48, Shawn Erickson wrote:
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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