I want to crop a UIImage that the size of the UIImage is 640*960 and i want to crop it and it will be 640*640.
I try to use this method:
CGImageRef imageRef = CGImageCreateWithImageInRect([largeImage CGImage], cropRect);
// or use the UIImage wherever you like
[UIImageView setImage:[UIImage imageWithCGImage:imageRef]];
CGImageRelease(imageRef);]]
and this CGRect : (0,0,640,640)
but it give me UIImage that is not 640*640 from the original UIImage
use the following function
UIImage *newImage = [self imageWithImage:mainDelegate.starImage scaledToSize:CGSizeMake(640, 640)];
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
This will return the image with size (newSize.width,newSize.height)
Related
The user can change the cropbox size which is shows default in edit screen. I tried with below code :
- (UIImage *)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect {
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
UIImage *cropped = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return cropped;
}
But it cropped fixed area. How to crop area which is selected by user ?
For Get Crop Image:
UIImage *croppedImg = nil;
CGRect cropRect = CGRectMake("AS YOu Need"); //set your rect size.
croppedImg = [self croppIngimageByImageName:self.imageView.image toRect:cropRect];
Use following code for call croppIngimageByImageName:toRect: method that return UIImage (with specific 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;
}
CGRect clippedRect = CGRectMake(0 ,0,180 ,180);
CGImageRef imageRef = CGImageCreateWithImageInRect(imgVw1.image.CGImage, clippedRect);
UIImage *newImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
imgVw1Cliped.image=newImage;
NSLog(#"%d",imgVw1Cliped.image.imageOrientation);
I have a view in which i am drawing the signature i want that the signature part of the view should be converted as UIImage and then display it in UIImageView here is the code which i got from net i am using for converting
UIGraphicsBeginImageContext(signatureView.bounds.size);
[signatureView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
logoImageView.image=img;
UIGraphicsEndImageContext();
Try this hope will help you.
- (UIImage *) getUIImageWithmyView:(UImyView *)myView
{
UIGraphicsBeginImageContextWithOptions(myView.bounds.size, myView.opaque, 0.0);
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * myImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return myImage;
}
use my bellow method...
- (UIImage *)captureView {
//hide controls if needed
CGRect rect = [signetureView bounds];//use your signature view's Rect means Frame;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
you can call this above method like bellow...
UIImage *tempImageSave=[self captureView];
try this:
UIGraphicsBeginImageContext(signatureView.bounds.size);
[signatureView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
logoImageView.image=img;
first endimagecontext and after that set/use that image in imageview
I want to crop UIImage with the following code:
- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
// or use the UIImage wherever you like
UIImage * img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return img;
}
This code is working fine in the simulator but giving unusual result on device.
Create a UIImage category and try adding this.
#implementation UIImage (Crop)
- (UIImage *)crop:(CGRect)cropRect {
cropRect = CGRectMake(cropRect.origin.x*self.scale,
cropRect.origin.y*self.scale,
cropRect.size.width*self.scale,
cropRect.size.height*self.scale);
CGImageRef imageRef = CGImageCreateWithImageInRect([self CGImage], cropRect);
UIImage *result = [UIImage imageWithCGImage:imageRef
scale:self.scale
orientation:self.imageOrientation];
CGImageRelease(imageRef);
return result;
}
Try this one :
- (UIImage *)cropImage:(UIImage *)oldImage {
CGSize imageSize = oldImage.size;
UIGraphicsBeginImageContextWithOptions(CGSizeMake( imageSize.width,imageSize.height - 150),NO,0.);
[oldImage drawAtPoint:CGPointMake( 0, -80) blendMode:kCGBlendModeCopy alpha:1.];
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return croppedImage;
}
I am a Fresher Developer in iPhone .
I want Merge Two Images and Get Only One Image In UIImageView without set alpha.
This is my code. This code is working using alpha,
but I want set without set alpha.
MYCODE:-
-(UIImage *)maskingImage:(UIImage *)image
{
CGSize sizeR = CGSizeMake(200, 220);
// UIImage *textureImage = [UIImage imageNamed:#"tt.png"];
UIImage *textureImage =imgView2.image;
UIGraphicsBeginImageContextWithOptions(sizeR, YES, textureImage.scale);
[textureImage drawInRect:CGRectMake(0.0, 0.0, 200, 220)];
UIImage *bottomImage = UIGraphicsGetImageFromCurrentImageContext();
UIImage *upperImage = image;
CGSize newSize = sizeR ;
UIGraphicsBeginImageContext(newSize);
[bottomImage drawInRect:CGRectMake(0.0, 0.0, 200, 220)];
[upperImage drawInRect:CGRectMake(0.0, 0.0, 200, 220) blendMode:kCGBlendModeNormal alpha:0.5];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Thanks in advance.
UIGraphicsBeginImageContext(YOUR SIZE);
//FIRST IMAGE
[FIRST_IMAGE drawInRect:CGRectMake(0, 0, YOUR_SIZE_WIDTH/2, YOUR_SIZE_HEIGHT)];
//SECOND IMAGE
[SECOND_IMAGE drawInRect:CGRectMake(YOUR_SIZE_WIDTH/2, 0, YOUR_SIZE_WIDTH/2, YOUR_SIZE_HEIGHT)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
use this function
- (UIImage * ) mergeImage: (UIImage *) imageA
withImage: (UIImage *) imageB
strength: (float) strength X:(float )x Y:(float)y{
UIGraphicsBeginImageContextWithOptions(CGSizeMake([imageA size].width,[imageA size].height), NO, 0.0);
[imageA drawAtPoint: CGPointMake(0,0)];
[imageB drawAtPoint: CGPointMake(x,y)
blendMode: kCGBlendModeNormal // you can play with this
alpha: strength]; // 0 - 1
UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return mergedImage;}
here x and y is the placemnt where you want to show second image
i just faced the same problem , now i got the solution for my problem
CGSize newSize = CGSizeMake(320, 377);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[ image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity
[image2 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.8];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Try this ,its work like a charm for me , i hope you will also get the solution.
you can use like --
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.0];
I'd like to combine two UIImages, one stretchable and one "normal" one. The problem is that if I merge the Images using the UIGraphicsImageContext, the scond image is also stretched (it is on top of the first one as it should be, but stretched). Does anybody know how to avoid this?
Thanks a lot!
calls from my ViewController:
UIImage *stretchImage = [[UIImage imageNamed:#"stretchableLeft.png"] stretchableImageWithLeftCapWidth:0.0 topCapHeight:16.0];
stretchImage = [self imageWithImage:stretchImage scaledToSize:CGSizeMake(64.0, 64.0)];
stretchImage = [self mergeImageWithImage:stretchImage secondImage:[UIImage imageNamed:#"topImage.png"]]; // only 40x40 Px
the two methods are:
- (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
- (UIImage*)mergeImageWithImage:(UIImage *)image secondImage:(UIImage *)image2
{
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
[image2 drawInRect:CGRectMake(10,10,image.size.width,image.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
I think the issue is that you're asking both images to draw in the full rectangle. That is causing your second image to stretch.
Try using the image2.size for image2 when merging the images. You'll have to adjust the placement using the x/y coordinate when drawing the rectangle.
- (UIImage*)mergeImageWithImage:(UIImage *)image secondImage:(UIImage *)image2
{
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
[image2 drawInRect:CGRectMake(10,10,image2.size.width,image2.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}