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Re: How to get image real number of bits per pixel
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Re: How to get image real number of bits per pixel


  • Subject: Re: How to get image real number of bits per pixel
  • From: Jeff Disher <email@hidden>
  • Date: Tue, 25 Feb 2003 20:44:40 -0500

How were you getting the NSBitmapImageRep from the imageView? It is possible that you were getting some sort of cached imagerep which would most likely be RGBA. If you get the representations from the image that you can get from the imageview, you could check its array of representations and see what it returns for each one.

Finding the _real_ representation of an image has been a point of frustration in my work as well.

Hope that helps,
Jeff.


On Tuesday, February 25, 2003, at 11:21 AM, Sebastien TOPIN wrote:

Hi Folks,

I am trying to get the real number of bits per pixel for a displayed image.
A NSImageView object enables me to drag n' drop a bmp image from the Finder
and display it in my app.
Then I got an NSBitmapImageRep from the NSImageView and did that:

int iBitsPerPix = [bittmapImageRep bitsPerPixel];

The result is always 32 even for grayscale 8 bits per pixel images or 24 bits
per pixel color images.

How can I get the image real number of bits per pixel of those images?

Thanks in advance,
Seb
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Jeff Disher
President and Lead Developer of Spectral Class
Spectral Class: Shedding Light on Innovation
http://www.spectralclass.com/
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References: 
 >How to get image real number of bits per pixel (From: "Sebastien TOPIN" <email@hidden>)

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