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Re: Problem of resolution with JPEGs

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Re: Problem of resolution with JPEGs

Subject: Re: Problem of resolution with JPEGs
From: Darrin Cardani <email@hidden>
Date: Mon, 14 Mar 2005 13:47:39 -0600

At 11:23 AM -0800 3/14/05, Arthur VIGAN <email@hidden> wrote:

I have a problem with NSImage. When I open some JPEGs, and draw the
image in a view, the size is wrong: I can see the pixels, and the
resolution is really bad, even when I have high definition images. Do
you know where the problem comes from?

NSImage uses the photo's resolution to scale it to the proper size (or something close to it) on screen. So a 300x300 pixel image with a resolution of 300 dpi will get scaled down to roughly 1 inch by 1 inch on screen, which will probably only be 72 pixels by 72 pixels.

What you need to do is get the image's NSBitmapImageRep and call [imageRep pixelsWide] and [imageRep pixelsHigh] to get the pixel dimensions of the image. That should give you what you want.

Darrin
--
Darrin Cardani - email@hidden
President, Buena Software, Inc.
<http://www.buena.com/>
Video, Image and Audio Processing Development
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