• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: NSBitmapImageRep with floating point values
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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
>
> _______________________________________________
>
> Cocoa-dev mailing list (email@hidden)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
>
> This email sent to email@hidden
>
_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden

  • Follow-Ups:
    • RE: NSBitmapImageRep with floating point values
      • From: Paul Morel <email@hidden>
References: 
 >NSBitmapImageRep with floating point values (From: Paul Morel <email@hidden>)
 >Re: NSBitmapImageRep with floating point values (From: David Duncan <email@hidden>)

  • Prev by Date: IKImageView to NSImage?
  • Next by Date: [iOS] NSUserDefaults best practices
  • Previous by thread: Re: NSBitmapImageRep with floating point values
  • Next by thread: RE: NSBitmapImageRep with floating point values
  • Index(es):
    • Date
    • Thread