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.
Instead of taking the CGImage into NSImage and then exporting the
NSImage, you might just use ImageIO to save the CGImage directly.
Look up CGImageDestination in the documentation and see if you get
better results using it to export as JPEG.
Scott
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