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Scaling an NSImage to have exact pixel dimensions
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Scaling an NSImage to have exact pixel dimensions


  • Subject: Scaling an NSImage to have exact pixel dimensions
  • From: Carl Hoefs <email@hidden>
  • Date: Thu, 09 Oct 2014 19:08:52 -0700

OS X 10.9

I need to scale an NSImage's dimensions to exactly 640x480 pixels before sending it remotely for processing. If I use NSImage's -setSize:(NSSize) method, it does set the size - temporarily. If I then try to serialize that NSImage into an NSData for transfer, that resize information seems to get lost:

    NSImage *oldImage = [[NSImage alloc] initWithContentsOfFile:myFilename];
    [oldImage setSize:NSMakeSize(640.0,480.0)];
    NSLog(@"Old Image: %@",oldImage);

    NSData *dataObj = [oldImage TIFFRepresentationUsingCompression:NSTIFFCompressionLZW factor:1.0 ];
    NSImage *newImage = [[NSImage alloc ] initWithData:dataObj];
    NSLog(@"New Image: %@",newImage);


* Old Image: <NSImage 0x618000267840 Size={640, 480} Reps=(
    "NSBitmapImageRep 0x6180002a4320 Size={1670, 1200} ColorSpace=(not yet loaded) BPS=8 BPP=(not yet loaded) Pixels=1670x1200 Alpha=NO Planar=NO Format=(not yet loaded) CurrentBacking=nil (faulting) CGImageSource=0x61800016b700"
)>

 * New Image: <NSImage 0x618000073e00 Size={1670, 1200} Reps=(
    "NSBitmapImageRep 0x6180000b4700 Size={1670, 1200} ColorSpace=(not yet loaded) BPS=8 BPP=(not yet loaded) Pixels=1670x1200 Alpha=NO Planar=NO Format=(not yet loaded) CurrentBacking=nil (faulting) CGImageSource=0x61800017e240"
)>

What is the correct way to do this?
-Carl


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