Do you have anyway to resize image from camera to small size. I would like to resize image to 612 * 612 with disk size is less than 100KB. This will help me to show image on application faster.
Any advise ?
Look at this post for help:
The simplest way to resize an UIImage?
and check out Apple's documentation on UIImage
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/Reference/Reference.html
Try with this:
-(UIImage *)imageWithImage:(UIImage *)imageToCompress scaledToSize:(CGSize)newSize {
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[imageToCompress drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Give your file name istead of getPath & call the above:
UIImage *img = [UIImage imageWithContentsOfFile:getPath];
UIImage *imageToPass = [self imageWithImage:img scaledToSize:CGSizeMake(612.0, 612.0)];
Related
I am using imagview with size of 320X320 to display large image (350 X 783).
While placing the large image into the imageview, the image looks squeezed, compressed something not like the quality one.
My question is, how can I make the large image into small with as good quality as the original image ?
You can set your image view a proper content mode, like that
imageView.contentMode = UIViewContentModeScaleAspectFit
-(UIImage*)scaleToSize:(CGSize)size {
// Create a bitmap graphics context
// This will also set it as the current context
UIGraphicsBeginImageContext(size);
// Draw the scaled image in the current context
[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
// Create a new image from current context
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
// Pop the current context from the stack
UIGraphicsEndImageContext();
// Return our new scaled image
return scaledImage;
}
You can do like this,
UIImage* sourceImage = "yourImage";
CGSize newSize=CGSizeMake(80,80);
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
yourImageView.image=newImage;
In my application i have image with dimension 1936*2592 and size upto 6 MB.
i need scale image to 0.25 or resize image to 478*640 and then upload it to server.
I have tried lots of ways to do it in ios6 but failed
imageData= UIImagePNGRepresentation(self.cl_PriviewImage);
UIImage *temp = [[UIImage alloc] initWithData: imageData];
ScaledImage = [temp resizedImage:CGSizeMake(478, 640) interpolationQuality:kCGInterpolationHigh];
ScaledData = UIImagePNGRepresentation( ScaledImage);
//self.cl_PriviewImage is my image
it shows resizedImage method not found.
I have also tried with ScaleToSize method but its showing same error.
i have also tried with
ScaledImage = [UIImage imageWithCGImage:self.cl_PriviewImage.CGImage scale:0.25f orientation:self.cl_PriviewImage.imageOrientation];
ScaledData = UIImagePNGRepresentation(ScaledImage);
in this case there is no error but my purpose didn't get fulfilled i.e uploaded image doesn't get changed in scale/size.
Is there any any other way in iOS 6 or am i wrong some where?
Please suggest me.
Thanks in advance
- (UIImage*) image:(UIImage *) image scaledToSize:(CGSize)newSize;
{
UIGraphicsBeginImageContextWithOptions(newSize, NO, 1);
CGContextSetInterpolationQuality(UIGraphicsGetCurrentContext(), kCGInterpolationHigh);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
You can also add this method in a UIImage category, that would be a better solution.
I have made a program for image effects but when I try to add the effects like photoshop using the code below the image is not allocated any memory and therefore the resulting image is not shown.
UIImage *bottomImage = originalImage;
UIImage *upperImage = originalImage;
UIGraphicsBeginImageContextWithOptions(sizeR, YES, imageBeforeEffect.scale);
[bottomImage drawInRect:CGRectMake(0.0, 0.0, sizeR.width, sizeR.height)];
[upperImage drawInRect:CGRectMake(0.0, 0.0, sizeR.width, sizeR.height) blendMode:kCGBlendModeDarken alpha:1.0];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Check if your sizeR has got any frame... put a break - point and check it. If there is no frame then the UIGraphicsBeginImageContextWithOptions will not work.
I'm trying to save a screenshot of a part of the screen with all views and layers merged. The only way I know how to do this is with the code below.
The code below creates an 80x80 square, but with a top left corner at 0,0.
How can I cut a smaller rectangle out of a full page screenshot? For example I have a 320x480 full window screenshot, but I only need an 80x80 square centered at 160,240?
UIGraphicsBeginImageContext(smallView.frame.size);
[appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Thank you!
after getting the screenshot image crop the required part using this
CGImageRef imageRef = CGImageCreateWithImageInRect([screenshot CGImage], cropRect);
UIImage *result = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
Untested suggestion...
UIGraphicsBeginImageContext(smallView.frame.size);
[appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()];
CGRect cropRect = UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
CGRectMake(160.0,240.0,smallView.frame.size.width,smallView.frame.size.height);
CGImageRef croppedImageRef = CGImageCreateWithImageInRect(screenshot.CGImage,cropRect);
UIImage *croppedScreenshot = [UIImage imageWithCGImage:croppedImageRef];
CGImageRelease(croppedImageRef);
UIGraphicsEndImageContext();
I am working on creating an image gallery which has thumbnails in different sizes. I want to convert these rectangle thumbnails to square size so that all of them could appear similar in size. I dont mind cropping it from extended portion but I am not sure how to do it. can anyone please help me?
Thanks
Pankaj
You need to use the image in rect method passing in the image and the required bounds...
CGImageRef imageRef = CGImageCreateWithImageInRect([anImage CGImage], requiredBounds);
UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
I have added this to a UIImage category (UIImage+Resize) in the following post, you can download the source code as well - Categories example
Well if you use an UIImageView to display your images (wich I am more than sure that you do) you can set it's contentMode property to UIViewContentModeScaleAspectFill. This should 'crop' your image to the boundaries of your UIImageView. In case your image will go out of the boundaries of the UIImageView make sure clipsToBounds is also set to YES.
Let me know if that helps.
I'm using the next method. The input are the UIImage to scale and the size of the UIImageView's frame where the UIImage is. It works when the frame's height and width are equal.
One important thing: I keep the image's ratio. I don't expand the image to cover the full square. If you want to do it you have to change the 'drawInRect' line for [self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)]; and remove the if-else.
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
CGFloat scaleRatio;
if (image.size.width > image.size.height) {
scaleRatio = image.size.height/image.size.width;
}else{
scaleRatio = image.size.width/image.size.height;
}
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(scaleRatio, scaleRatio);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextConcatCTM(context, scaleTransform);
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0);
if (image.size.width > image.size.height) {
[image drawInRect:CGRectMake(0, (newSize.height/2)-(newSize.height*scaleRatio/2), newSize.width, newSize.height*scaleRatio)];
}else{
[image drawInRect:CGRectMake((newSize.width/2)-(newSize.width*scaleRatio/2), 0, newSize.width*scaleRatio, newSize.height)];
}
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}