Hi,
I'm trying to save an NSBitmapImageRep initialized with -
initWithCGImage: onto a disk.
But the image of the saved file is bad. This means only black and
white horizontal lines are drawn meaninglessly.
The _rep in the below code is the NSBitmapImageRep instance allocated
and initialized with -initWithCGImage: as I said at the beginning,
and the image rep has alpha.
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
{
NSDictionary* properties = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber
numberWithFloat:0.7], NSImageCompressionFactor,
[NSNumber
numberWithBool:YES], NSImageProgressive, nil];
NSData* result = [_rep representationUsingType:NSJPEGFileType
properties:properties];
return result;
}
The NSBitmapImageRep is logged like the following:
0x15ce70 Size={400, 264} ColorSpace=NSCalibratedRGBColorSpace BPS=8
BPP=32 Pixels=400x264 Alpha=YES Planar=NO Format=2
Would you tell me what I'm missing?
Thank you for reading this message.
Norio
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