RE: NSBitmapImageRep with floating point values
RE: NSBitmapImageRep with floating point values
- Subject: RE: NSBitmapImageRep with floating point values
- From: Paul Morel <email@hidden>
- Date: Sat, 5 Feb 2011 16:33:53 +0100
- Importance: Normal
Hi,
thank you very much for the idea! I'll try that!
Paul
Date: Fri, 4 Feb 2011 21:07:10 -0800
Subject: Re: NSBitmapImageRep with floating point values
From: email@hidden
To: email@hidden
CC: email@hidden; email@hidden
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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