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trying to save NSImage with different resolution

Subject: trying to save NSImage with different resolution
From: Alexander Cohen <email@hidden>
Date: Fri, 29 Sep 2006 11:46:15 -0400
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Hi, i wrote a function that is a NSImage category. It takes an NSImage and returns an NSBitmapImageRep with a different DPI. I use that bitmap to save out the data as any of the supported formats. My problem is that the dpi seems to be coming out ok but the actual image comes out very small and in the top left corner of the output. What might i be doing wrong?

- (NSBitmapImageRep*)bitmapImageRepWithDpi:(float)dpi { float dpiRatio = dpi/72.0; NSSize mySize = [self size]; NSRect offscreenRect = NSMakeRect(0.0, 0.0, mySize.width*dpiRatio, mySize.height*dpiRatio); NSRect myRect = NSMakeRect(0,0,mySize.width, mySize.height); NSBitmapImageRep* offscreenRep = nil;

offscreenRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:nil pixelsWide:offscreenRect.size.width pixelsHigh:offscreenRect.size.height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSCalibratedRGBColorSpace bitmapFormat:0 bytesPerRow:(4 * offscreenRect.size.width) bitsPerPixel:32]; [offscreenRep setSize:mySize]; [NSGraphicsContext saveGraphicsState]; [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:offscreenRep]];

[self drawInRect:myRect fromRect:myRect operation:NSCompositeCopy fraction:1.0];

	[NSGraphicsContext restoreGraphicsState];
	
	return [offscreenRep autorelease];	
}


thanks

AC
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	>Re: Rounding the output value while the slider is being moved (From: "I. Savant" <email@hidden>)

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