Re: why every image has the same resolution?
Re: why every image has the same resolution?
- Subject: Re: why every image has the same resolution?
- From: Shawn Erickson <email@hidden>
- Date: Fri, 8 Oct 2004 07:27:44 -0700
On Oct 7, 2004, at 5:25 PM,
김경옥 wrote:
Hi,
I got resolutions of images from - (float) dpiX { return 72.0*[theRep pixelsWide]/[theRep size].width; }
Even though the resolution of an image is 150 dpi in windows system, my cocoa app gets 72 dpi for the image.
I mean the resolution of every image turns out only 72 dpi in my cocoa app.
is it correct in MacOS?
Does the resolution of image depend on the system?
I thought each image has its own resolution info.
Possibly you are probing an image representation that was cached in support of drawing your image on the screen since the default window/screen resolution on Mac OS X is currently 72 DPI (matches typographic standard resolution). In other words your image is being down scaled for display on the screen but the original image data is still at the original resolution.
However another common source is that the image itself isn't tagged correctly or at least not as you believe, so it is seen as having 72 DPI not 150 DPI as you believe.
Please outline what you are trying to do and currently doing (show some code) so we can better help you.
-Shawn
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