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Re: Switching off antialiasing...

On Thursday, July 19, 2001, at 10:30 Uhr, Stefan Jung wrote:

...is very easy for the on screen display. But what is the trick to
do this with an image?

Just the same...

I tried a lot with lockig focus and so on...no chance. The TIFF I
want to save is always antialiased, regardless it is set or not.

That's because the conversion to TIFF is not happening where you think it's happening.

My code:

-(void)saveAsTIFF:sender
{
NSImage *specImage;
NSSavePanel *sp;
int result;
NSGraphicsContext *graphicsContext;

specImage = [[NSImage alloc] initWithSize:[self bounds].size];
[specImage lockFocus];
graphicsContext = [NSGraphicsContext currentContext];
[graphicsContext setShouldAntialias:NO];
[specImage initWithData:[self dataWithPDFInsideRect:[self bounds]]];

This initializes the specImage with the PDF-representation of your view. It doesn't actually render anything. It is also wrong in that you're sending an -init... message to an NSImage that's already been initialized.

Try [self drawRect:[self bounds]] instead (not 100% sure, but it's the right direction, somehow I think [self frame] would be better)

[specImage unlockFocus];

sp = [NSSavePanel savePanel];
[sp setRequiredFileType:@"TIFF"];

result = [sp runModalForDirectory:NSHomeDirectory() file:[[self
window] title]];

if (result == NSOKButton) {
if (![[specImage TIFFRepresentation] writeToFile:[sp
filename] atomically:YES])

This is where the rendering is taking place in your example, and since the current-context has changed again, you're not seeing the effects of setAntiAlias of the previous context.

Marcel

References: 
 >Switching off antialiasing... (From: Stefan Jung <email@hidden>)



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