Re: NSBitmapImageRep with floating point values
Re: NSBitmapImageRep with floating point values
- Subject: Re: NSBitmapImageRep with floating point values
- From: Ken Ferry <email@hidden>
- Date: Fri, 4 Feb 2011 21:07:10 -0800
On Thu, Feb 3, 2011 at 2:37 PM, David Duncan <email@hidden> wrote:
> On Feb 3, 2011, at 1:32 PM, Paul Morel wrote:
>
> > in my application I would need to save an image where pixel intensities
> are floating point values. Apparently TIFF can support that.But I don't know
> I can do that in Objective-C. I saw that there is a bitmap format
> "NSFloatingPointSamplesBitmapFormat" that can be used. Does anybody knows
> how to use it? I tried to use a (float **) instead of (unsigned char **) but
> it doesn't work of course, because it is supposed to receive (unsigned char
> **)!
>
> Did you try just allocating an appropriately sized buffer and typecasting
> to (unsigned char **)? The type cast doesn't change the data, just the
> compiler's interpretation of it (and since this is a pointer that won't
> affect the data itself in anyway).
>
Yes, unsigned char here really is just intended to signify "raw data" - a
byte stream. The byte stream may be interpreted as floating point data
channels.
-Ken
> --
> David Duncan
>
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