Re: NSBitmapImageRep bitmapData contains all zeroes?
Re: NSBitmapImageRep bitmapData contains all zeroes?
- Subject: Re: NSBitmapImageRep bitmapData contains all zeroes?
- From: "Raphael Sebbe" <email@hidden>
- Date: Fri, 25 Apr 2008 16:49:07 +0200
Hi,
how do you "convert" CIImage to NSBitmapImageRep ?
Raphael
On Fri, Apr 25, 2008 at 4:34 PM, Nick Forge <email@hidden> wrote:
> I am working on a Computer Vision project that uses real-time image
> processing. I am grabbing frames using QTKit, then converting the resulting
> CVImageBufferRef into a CIImage, and then converting that into an
> NSBitmapImageRep. I know that my resulting NSBitmapImageRep is fine, since I
> am viewing it by sticking it in an NSImage and then popping that into an
> NSImageView (the QTKit Capture Preview has a 1/2 second lag time - which is
> unacceptable for this project). Everything works as it should, but when I go
> to grab the raw pixel data from the NSBitmapImageRep like so:
>
> unsigned char *bitmapData = [self bitmapData];
>
> (btw it says "self" because this is from a category of NSBitmapImageRep)
>
> The resulting array, bitmapData, is an array of zeroes! Every pixel sample
> in bitmapData is zero, yet I can draw the image and the image IS there.
> What's going on? Any suggestions as to what I may be overlooking?
>
> Thanks in advance,
> Nick Forge
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