Re: How to set dpi of an image
Re: How to set dpi of an image
- Subject: Re: How to set dpi of an image
- From: Mahaboob <email@hidden>
- Date: Fri, 22 May 2009 10:18:31 +0530
- Thread-topic: How to set dpi of an image
I gone through that links and I can't figure it out how to set the dpi.
By googling I found a function to set dpi in windows :
public RenderTargetBitmap(
int pixelWidth,
int pixelHeight,
double dpiX,
double dpiY,
PixelFormat pixelFormat
)
Is there any equivalent method?
Is it my size calculation is right?
On 5/21/09 2:09 PM, "email@hidden" <email@hidden>
wrote:
>
> On 21 May 2009, at 08:29, Mahaboob wrote:
>
>> I need to save the image with respect to the given dpi.
>> I calculated the image size proportional to the dpi and saved it.
>> But when I'm viewing the dpi from preview it shows only 72 dpi.
>>
>> I used the code like:
>>
>> float compressionFactor = [compressionSlider floatValue];
>>
>> NSDictionary *jpegProperties = [NSDictionary dictionaryWithObject:
>> [NSNumber
>> numberWithFloat: compressionFactor] forKey: NSImageCompressionFactor];
>>
>> NSSize size = [image size];
>>
>> unsigned int resfac = (unsigned int)[bitmapResolution
>> intValue];
>>
>>
>>
>> [image setScalesWhenResized:YES];
>>
>>
>>
>> [image setSize:NSMakeSize(size.width * resfac/72, size.height *
>> resfac/72)];
>>
> setSize: doesn't change the underlying image reps
> see the docs
> http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Im
> ages/Images.html#/
> /apple_ref/doc/uid/TP40003290-CH208-SW2
>
> or this http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/
>
> Apple has some decent sample code with CoreImage additions here
> http://developer.apple.com/SampleCode/Reducer/listing16.html
>
>>
>> NSBitmapImageRep *theBmapRep = [NSBitmapImageRep imageRepWithData:
>> [image
>> TIFFRepresentation]];
>>
>> NSData *exportedData;
>>
>> exportedData = [ theBmapRep representationUsingType:NSJPEGFileType
>> properties:jpegProperties];
>>
>> Is it I'm missing something?
>> How can I set the exact dpi?
>>
>> Thanks in advance
>> Mahaboob
>>
>>
>>
>>
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>
> Jonathan Mitchell
>
> Central Conscious Unit
> http://www.mugginsoft.com
>
>
>
>
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