Iphone 调整大小后增强图像质量

有人能提出一些方法来提高图像的质量吗？把图像调整到更大的尺寸？

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调整大小时，生成的图像将像素化。我需要最大程度地减少像素化。

您可以使用以下代码压缩或增加图像大小

CGFloat compression = 222.0f;
CGFloat maxCompression = 202.1f;
int maxFileSize = 160*165; //fill your size need

NSData *imageDat = UIImageJPEGRepresentation(image.image, compression);

while ([imageDat length] > maxFileSize && compression > maxCompression)
{
compression -= 0.1222;
imageDat = UIImageJPEGRepresentation(decodedimage.image, compression);
}
NSLog(@"image compressed success");

[image setImage:[UIImage imageWithData:imageDat]];

image1 = [self imageWithImage:image1 convertToSize:CGSizeMake(100, 100)]; 

// For convert the image to fix size

- (UIImage *)imageWithImage:(UIImage *)image convertToSize:(CGSize)size 
{
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0, 0, 320,460)];
UIImage *destImage = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();
return destImage;
}

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您可以使用以下代码压缩或增大图像的大小

CGFloat compression = 222.0f;
CGFloat maxCompression = 202.1f;
int maxFileSize = 160*165; //fill your size need

NSData *imageDat = UIImageJPEGRepresentation(image.image, compression);

while ([imageDat length] > maxFileSize && compression > maxCompression)
{
compression -= 0.1222;
imageDat = UIImageJPEGRepresentation(decodedimage.image, compression);
}
NSLog(@"image compressed success");

[image setImage:[UIImage imageWithData:imageDat]];

image1 = [self imageWithImage:image1 convertToSize:CGSizeMake(100, 100)]; 

// For convert the image to fix size

- (UIImage *)imageWithImage:(UIImage *)image convertToSize:(CGSize)size 
{
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0, 0, 320,460)];
UIImage *destImage = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();
return destImage;
}

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有一篇文章叫：，你应该阅读并理解其中给出的每一个方面。我想它会回答你脑海中出现的每一个问题。我认为这是一篇漂亮的文章，具有适当的图形表示（意味着阅读时不那么枯燥）