Converting Large images to low size in IOS [duplicate] - ios

Question

This question already has answers here:
How to easily resize/optimize an image size with iOS?
(18 answers)
How to compress/resize image on iOS before uploading to a server?
(13 answers)
Closed 9 years ago.
I am working on an app which has to load images taken from camera which is generally around 5-6MB , into tableview. I am loading the image asynchronously and caching it but i want to know that is there any way through which i can change this large size images to lower size?

Answer 1

try this simple way ... i found from this post What's the easiest way to resize/optimize an image size with the iPhone SDK?
+ (UIImage*)imageWithImage:(UIImage*)image
scaledToSize:(CGSize)newSize;
{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}

Answer 2

Here i put logic of both Crop and resize image, use it as per your requirement.
For Get Cropped Image:
UIImage *croppedImg = nil;
CGRect cropRect = CGRectMake(AS YOu Need); // set frame as you need
croppedImg = [self croppIngimageByImageName:self.imageView.image toRect:cropRect];
The following method that return UIImage (as You want size of image)
- (UIImage *)croppIngimageByImageName:(UIImage *)imageToCrop toRect:(CGRect)rect
{
//CGRect CropRect = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height+15);
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
UIImage *cropped = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return cropped;
}
Here you get Croped Image that return by above method;
OR RESIZING
And also use following method with specific hight and width of image for Resizing:
+ (UIImage*)resizeImage:(UIImage*)image withWidth:(CGFloat)width withHeight:(CGFloat)height
{
CGSize newSize = CGSizeMake(width, height);
CGFloat widthRatio = newSize.width/image.size.width;
CGFloat heightRatio = newSize.height/image.size.height;
if(widthRatio > heightRatio)
{
newSize=CGSizeMake(image.size.width*heightRatio,image.size.height*heightRatio);
}
else
{
newSize=CGSizeMake(image.size.width*widthRatio,image.size.height*widthRatio);
}
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
This method return NewImage, with specific size that you want.