Re: NSImageView setImageScaling:NSScaleToFit blurs image

FROM : R.L. Grigg
DATE : Tue Mar 04 22:44:30 2008

Mike, Jens,

I created a NSImageView subclass and call [[NSGraphicsContext 
currentContext] setImageInterpolation:NSImageInterpolationNone] in 
the overridden -drawRect: method just before invoking [super 
drawRect:aRect]. It works perfectly!!! I get a clean scaled-up image 
with no blurring!

Thanks, I learned a lot!
Russ


On Mar 4, 2008, at 12:59 PM, Jens Alfke wrote:

>
> On 4 Mar '08, at 12:02 PM, R.L. Grigg wrote:
>

>> Mike, yes that is something we tried but it seems to have no 
>> effect on the blurring.

>
> You have to set the interpolation at the moment the image is being 
> drawn, i.e. just before the NSImage draw/composite call. You can't 
> do this using a regular NSImageView; it draws the image for you and 
> has no ability to configure the interpolation.
>
> You can either make a custom NSView and do the drawing in its -
> drawRect: method; or you can create a scaled-up NSImage, draw the 
> small NSImage into it using the appropriate interpolation, and then 
> put the scaled-up NSImage into the NSImageView.
>
> —Jens


On Mar 4, 2008, at 11:52 AM, Mike Abdullah wrote:

> When you draw the image, have you tried doing [[NSGraphicsContext 
> currentContext] setImageInterpolation: NSImageInterpolationNone] ?
>
> Mike.
>