Re: How to get image real number of bits per pixel
Re: How to get image real number of bits per pixel
- Subject: Re: How to get image real number of bits per pixel
- From: Marco Binder <email@hidden>
- Date: Tue, 25 Feb 2003 18:25:17 +0100
I guess you can ask the NSImageView for the path of the dropped file
(please see docs yourself- I m busy at the moment). With the path, you
can then instantiate a new NSBitmapImageRep. I know, this is waste of
memory (TWO bitmap reps of the same image), but I could not yet figure
out another way. You could of course subclass NSImageView and intercept
the file-drop. Then set up a NSBitmapImageRep and add it to a newly
created NSImage. Supply then this image as an argument when calling
[myImageViewObject setImage:newlyCreatedImage].
marco
Am Dienstag, 25.02.03 um 18:14 Uhr schrieb Sebastien TOPIN:
Thanks but how do you get the image data? Is it directly from the file?
I was trying to use the drag'n drop functionality (drag an image from
the
Finder to your application image control) in order to open my image
file. In
this case I already get an instantiated NSBitmapImageRep from
NSImageView
and just extract its parameters. This is what gives me the 32 bits per
pixel.
----- Original Message -----
From: "Marco Binder" <email@hidden>
To: "Sebastien TOPIN" <email@hidden>
Cc: <email@hidden>
Sent: Tuesday, February 25, 2003 5:57 PM
Subject: Re: How to get image real number of bits per pixel
Directly instantiate an NSBitmapImageRep with the image-data and call
the method. As to my experience, Cocoa will always use 8-bit RGBA to
display images in an NSImageView.
marco
Am Dienstag, 25.02.03 um 17:21 Uhr schrieb Sebastien TOPIN:
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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