Re: How to scale an NSImage (with smaller memory size)?
Re: How to scale an NSImage (with smaller memory size)?
- Subject: Re: How to scale an NSImage (with smaller memory size)?
- From: John Pannell <email@hidden>
- Date: Thu, 30 Sep 2004 19:56:48 -0600
There are other ways to perform this task (i.e. vImage, or CoreImage in Tiger?), but the following has worked for me. "theImage" is the NSImage you wish to thumbnail.
NSImage *thumbImage = [[NSImage alloc] initWithSize:NSMakeSize(128, 128)];
NSAffineTransform *at = [NSAffineTransform transform];
[theImage setScalesWhenResized:YES];
heightFactor = 128.0/[theImage size].height;
widthFactor = 128.0/[theImage size].width;
if(heightFactor > widthFactor){
scale = widthFactor;
} else {
scale = heightFactor;
}
[at scaleBy:scale];
[thumbImage lockFocus];
[[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationLow];
[theImage setSize:[at transformSize:[theImage size]]];
[theImage compositeToPoint:NSMakePoint((128-[theImage size].width)/2 , (128-[theImage size].height)/2) operation:NSCompositeCopy];
[thumbImage unlockFocus];
At this point, thumbImage is now an NSImage you can work with further. Hope this helps!
John
On Sep 30, 2004, at 4:00 PM, Peter Schmidt wrote:
Hello List,
How can I make from an NSImage (of a JPEG file) a smaller version, e.g. from a 1000 * 1000 pixel picture, a 128 * 128 pixel picture and store this into a new NSImage?
Greetings from Germany,
Peter
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