I need to save an NSImage as a TIFF file, as a 1-bit (black and white) image,
and at a specific resolution (dpi). I have my NSImage being created in RGB
mode, and I can save it (as RGB).
I've been trying to read the other posts on 1-bit images, but I don't
understand things like "you'll have to fill it yourself".
(http://www.cocoabuilder.com/archive/cocoa/204408-1-bit-nsbitmapimagerep.html?q=%221+bit+image%22#204521)
Does anyone have some code they could share to take an NSImage and then make it
1-bit?
Also, I have tried to use [nsImage setSize:NSMakeSize(fx, fy)] on an NSImage
and it appears to work, but when I save the image then it defaults back to
72dpi (the default). So is there something that I need to do to aside from
setSize?
Here's what I am using for my saving method:
-(IBAction)saveImage:(id)sender
{
IKSaveOptions *saveOptions = [[IKSaveOptions alloc]
initWithImageProperties: NULL
imageUTType: @"public.tiff"];
NSSavePanel *savePanel = [NSSavePanel savePanel];
[savePanel setAllowedFileTypes:[NSArray arrayWithObject:@"tif"]];
[savePanel setTitle:@"Save QR Image As TIF"];
[savePanel setMessage:@"TIF will be the file type of the image."];
[savePanel beginWithCompletionHandler:^(NSInteger result)
{
if (result == NSFileHandlingPanelOKButton)
{
NSString *newUTType = [saveOptions imageUTType];
NSURL *url = [savePanel URL];
CGImageRef image = [qrImage CGImageForProposedRect:NULL context:NULL
hints:NULL];
if (image)
{
CGImageDestinationRef dest = CGImageDestinationCreateWithURL((CFURLRef)url,
(CFStringRef)newUTType, 1, NULL);
if (dest)
{
CGImageDestinationAddImage(dest, image,
(CFDictionaryRef)[saveOptions imageProperties]);
CGImageDestinationFinalize(dest);
CFRelease(dest);
} //(dest)
} //(image)
//CALL ASOC FILE PLACER HERE
} //(result == NSFileHandlingPanelOKButton)
} ]; //savePanel
}
Thanks,
Chris
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