Reduce Resolution UIImage/UIImageView

Question

I've created a UIImageView which contains an image with a high resolution. The problem is that the resolution of that image is too high to put into the imageView. The size of the imageView is 92 x 91 (so it's small). It contains an UIImage, whose resolution is too high so it looks ugly in the UIImageView. So how can I reduce the resolution of that UIImage?

My code for the UIImageView:

UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:pngFilePath]];
    myImageView.frame = CGRectMake(212.0, 27, 92,91);

What is your definition of resolution? It's often used as the number of pixels per unit. It sounds like you define it as the dimensions of an image. — El Tomato, May 25 '13 at 13:26

score 2 · Accepted Answer · edited May 23 '17 at 12:09

2

have a look at this

https://stackoverflow.com/a/2658801

This will help you to resize your image according to your need

Add method to your code and call like this

UIImage *myImage =[UIImage imageWithContentsOfFile:pngFilePath];
UIImage *newImage =[UIImage imageWithImage:myImage scaledToSize:CGSizeMake(92,91)];

edited May 23 '17 at 12:09

Community

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answered May 25 '13 at 12:39

George

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How can I implement that class method? – user2420219 May 25 '13 at 12:41
please find it in the updated answer – George May 25 '13 at 13:31

score 1 · Answer 2 · answered May 25 '13 at 12:43

You can resize an image using this method that returns a resized image :

 -(UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    // Here pass new size you need
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

Hope it helps you.

how do I implement this code with my UIImage? – user2420219 May 25 '13 at 13:01 — user2420219, May 25 '13 at 13:01

score 0 · Answer 3 · answered May 25 '13 at 12:08

0

try with this

     myImageView.contentMode = UIViewContentModeScaleToFill;

answered May 25 '13 at 12:08

SAMIR RATHOD

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How does this answer the question at all? – Rambatino Feb 24 '15 at 19:08

score 0 · Answer 4 · answered May 25 '13 at 12:14

You need to downsize the image, which will reduce the resolution, make it easier to store. I actually wrote a class (building on some stuff from SO) that does just that. It's on my github, take a look:

https://github.com/pavlovonline/UIImageResizer

the main method is

-(UIImage*)resizeImage:(UIImage*)image toSize:(CGFloat)size

so you give this method the size to which you want to downsize your image. If the height is greater than the width, it will auto-calculate the middle and give you a perfectly centered square. Same for width being greater than height. If you need an image that is not square, make your own adjustments.

so you'll get back a downsized UIImage which you can then put into your UIImageView. Save some memory too.

Reduce Resolution UIImage/UIImageView

4 Answers4