I need to save the image with respect to the given dpi.
I calculated the image size proportional to the dpi and saved it.
But when I'm viewing the dpi from preview it shows only 72 dpi.

I used the code like:

float compressionFactor = [compressionSlider floatValue];
    
NSDictionary *jpegProperties = [NSDictionary dictionaryWithObject: [NSNumber
numberWithFloat: compressionFactor] forKey: NSImageCompressionFactor];
    
    NSSize size = [image size];
    
    unsigned int     resfac =  (unsigned int)[bitmapResolution intValue];
    
    
    
    [image setScalesWhenResized:YES];
    
    
    
    [image setSize:NSMakeSize(size.width * resfac/72, size.height *
resfac/72)];
    
           
    NSBitmapImageRep *theBmapRep = [NSBitmapImageRep imageRepWithData:[image
TIFFRepresentation]];
    
NSData *exportedData;

exportedData = [ theBmapRep representationUsingType:NSJPEGFileType
properties:jpegProperties];

Is it I'm missing something?
How can I set the exact dpi?

Thanks in advance
Mahaboob

 


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