macOS 12.5
I try to make a sub image (subRect has size 32 x 32) like:
NSRect pubRect = NSZeroRect; pubRect.size = subRect.size;
NSImage *subImage = [ [NSImage alloc] initWithSize: subRect.size ];
[ subImage lockFocus ];
[ self.image drawAtPoint: NSMakePoint(0, 0)
fromRect: subRect
operation:
NSCompositingOperationCopy
fraction: 1
];
NSBitmapImageRep *oneRep = [ [ NSBitmapImageRep alloc ]
initWithFocusedViewRect: pubRect ];
[ subImage unlockFocus ];
NSData *subData = [ oneRep representationUsingType: NSPNGFileType properties:
@{} ];
the image looks fine, but when I write subData to disk, it has 64 x 64 pixels.
How can this doubling of pixels be avoided?
Gerriet.
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