导出的PNG模糊

我试图生成一个qr并将其导出到PNG，但是，只要我这样做，它会将其导出为模糊图像。我不确定我能做些什么来使它不模糊。当我将文件导出导出的PNG模糊

这里是我使用的代码

在预览窗口中

：

它发生2例。任何帮助或建议将不胜感激，因为我仍然是新的语言，并试图找出问题。

这里说到我的代码：

- (NSImage *)scaleImageTo:(NSImage *)inputImage size:(NSSize)newSize 
{ 
    NSImage *cropped = [[NSImage alloc] initWithSize:NSMakeSize(newSize.width, newSize.height)]; 

    [cropped lockFocus]; 
    [inputImage drawInRect:NSMakeRect(0,0,cropped.size.width,cropped.size.height) 
       fromRect:NSMakeRect(0,0,inputImage.size.width,inputImage.size.height) 
       operation:NSCompositeCopy 
       fraction:1.0]; 
    [cropped unlockFocus]; 


    NSRect rect = NSMakeRect(0, 0, cropped.size.width, cropped.size.height); 

    CIImage* ciImage1 = [[CIImage alloc] initWithData:[cropped TIFFRepresentation]]; 


    [[NSGraphicsContext currentContext] setShouldAntialias: NO]; 

    NSImage *buffer2 = [[NSImage alloc] initWithSize:NSMakeSize([cropped size].width , [cropped size].height)]; 

    [buffer2 lockFocus]; 
    CIFilter* filter2 = [CIFilter filterWithName:@"CIMaskToAlpha"]; 
    [filter2 setValue:ciImage1 forKey:@"inputImage"]; 

    CIImage* output2 = [filter2 valueForKey:@"outputImage"]; 

    [output2 drawAtPoint:NSZeroPoint fromRect:rect operation:NSCompositeSourceOver fraction:1.0]; 


    //background 
    [[_backgroundColorSelector color] set]; 
    NSRectFillUsingOperation(rect, NSCompositeSourceAtop); 
    //foreground 
    [[_foregroundColorSelector color] set]; 
    NSRectFillUsingOperation(rect, NSCompositeDestinationAtop); 

    [buffer2 unlockFocus]; 
    return buffer2; 
} 
- (void)writeImageAt:(NSImage *)img path:(NSString *)strPath 
{ 
    //create a NSBitmapImageRep 
    NSBitmapImageRep *bmpImageRep = [[NSBitmapImageRep alloc]initWithData:[img TIFFRepresentation]]; 
    //add the NSBitmapImage to the representation list of the target 
    [img addRepresentation:bmpImageRep]; 

    //get the data from the representation 
    NSData *data = [bmpImageRep representationUsingType: NSPNGFileType 
              properties: nil]; 
    [data writeToFile:strPath atomically:YES]; 
} 
- (void)savePNGAt:(NSImage *)img path:(NSString *)strPath 
{ 
    NSString * qrWidth = [_qrWidth stringValue]; 
    NSString * qrHeight = [_qrHeight stringValue]; 

    if (qrHeight != nil && ![qrWidth isEqualToString:@""] && qrWidth != nil && ![qrHeight isEqualToString:@""]) { 
     NSSize newSize = NSMakeSize([qrWidth floatValue], [qrHeight floatValue]); 
     img = [self scaleImageTo:img size:newSize]; 
     [self writeImageAt:img path:strPath]; 
    } 
    else 
    { 
     img = [self changeImageColor:img]; 
     [self writeImageAt:img path:strPath]; 
    } 
}

来源

2012-11-10 incoe

几乎可以肯定，当图像缩放img = [self scaleImageTo:img size:newSize];而不是做你应该重现QR图像中的正确尺寸显示/打印/输出的模糊介绍/等等

来源

2012-11-11 21:06:37 gordy

导出的PNG模糊

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