Re: NSImage resizing
Re: NSImage resizing
- Subject: Re: NSImage resizing
- From: "Parimal Das" <email@hidden>
- Date: Tue, 13 Jan 2009 14:08:40 +0530
hi
whenever i am running this through the command line, my app is crashing with
the error "GraphicsConetext not init"
my code crashes at the call of [lock focus]i am not creating any view till
now
So can i do it without lock/unlock focus and without view
and if not then is it possible to create a hidden view from command line so
the user wont get any wind that the view was called ..
Advanced Thanx ppl
-Parimal
On Fri, Jan 9, 2009 at 10:25 PM, Steve Christensen <email@hidden> wrote:
> For a bitmap image, -setSize: effectively alters the DPI of the pixels but
> doesn't actually create a new bitmap of a different size. So for a 72dpi
> image, the NSBitmapImageRep's -width and -height methods should give you the
> same values as for the image's -size method. But for a 300dpi image, for
> example, you'd expect the -width and -height values to be about 4x larger
> than the -size value.
>
> Maybe something like this would do what you want?
>
> NSImage* originalIcon = [[NSWorkspace sharedWorkspace]
> iconForFile:filePath];
> NSRect resizedBounds = NSMakeRect(0, 0, 384, 384);
> NSImage* resizedIcon = [[[NSImage alloc] resizedBounds.size] autorelease];
>
> [resizedIcon lockFocus];
> [originalIcon drawInRect:resizedBounds fromRect:NSZeroRect
> operation:NSCompositeCopy fraction:1.0];
> [resizedIcon unlockFocus];
>
> NSBitmapImageRep* bitmapImage = [[resizedIcon representations]
> objectAtIndex:0];
> [[bitmapImage representationUsingType:NSJPEGFileType properties:dict]
> writeToFile:destPath atomically:YES];
>
> Probably safer to iterate the representation(s) and actually add a check to
> see that bitmapImage really is one before actually using it, just in case
> another representation is created.
>
> steve
>
>
>
> On Jan 9, 2009, at 5:50 AM, Parimal Das wrote:
>
> hi
>> in my application i need to resize a .jpg image through a command line
>>
>> my code is
>>
>> NSImage *icon = [[NSWorkspace sharedWorkspace] iconForFile:filePath]; //
>> get
>> icon from the file at filePath destination
>>
>> NSSize imageSize;
>>
>> imageSize.width = 384.0; // in points (384 pts = 512 px )
>>
>> imageSize.height = 384.0;
>>
>>
>> [icon setSize:imageSize]; // set image size
>>
>>
>> NSData * tiffData = [icon TIFFRepresentation];
>>
>> bitmapImageRep = [NSBitmapImageRep imageRepWithData:tiffData];
>>
>> [[bitmapImageRep representationUsingType:NSJPEGFileType properties:dict]
>> writeToFile:destPath atomically:YES]; // write it to a file path stored in
>> destPath
>>
>>
>> this code is not altering the size at all
>>
>> i cant create a NSView as its a command line app
>>
>> any suggestions ??? how to resize it??
>>
>
>
--
--
Warm Regards,
Parimal Das
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