Making Subimages
Subject : Making Subimages From: "Maryanna Rogers" <email@hidden >
Date: Sun, 27 May 2007 18:30:07 -0400
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Hi, I'm trying to obtain subimage of an existing image, and have been having
some trouble. Here's what I'm doing. I've got an NSBitmapImageRep: NSBitmapImageRep * imageRep = ... I can write this to a .tiff file, and it looks normal. I want to get subimages of this image. In order to do that, I first create
an NSImage* : NSData *tiffData = [imageRep TIFFRepresentation];
NSImage * myimage = [[NSImage alloc] initWithData:tiffData ]; Then, try to chop it up: NSPoint pt = NSMakePoint(0, 0);
NSRect box = NSMakeRect(0, 0, 100, 100);
[img lockFocus];
[myimage compositeToPoint:pt fromRect:box operation:NSCompositeCopy];
[img unlockFocus]; .. but the resulting images are not drawn as I expect. It appears it's using
(0, h),
as opposed to (0, 0) as the origin of myimage. In other words, if I try to
create a
10x10 image starting from (0, 0), I will get a 10x10 image from (0, height)
instead. Why is this happening? Is this a problem with the bitmap->TIFF conversion? Thanks. ~m
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