how to compress the saved image in iphone application

Question

I have app in which i capture the image it works fine but i want to reduce the size of the image i searched from net i found some code which is here

This is my code working fine when image captured

NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];

NSData *imageData = UIImagePNGRepresentation(pickedImage);

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

I want to reduce the size of picked image i got the following code but i am did not getting it use like it use newSize but where it is using the original image to compress

UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

what you want ?? save that image with new size in your Phone Library?? — Paras Joshi, Jul 22 '13 at 06:43
Why don't you search before asking ? There are already many answers. — TheTiger, Jul 22 '13 at 06:44
@ParasJoshi yes i want to save the captured image with compress size in documents folder of app — user2240329, Jul 22 '13 at 06:44
@user2240329 see my answer and save that new Image and check the photo album , you can see this new image with new size.. — Paras Joshi, Jul 22 '13 at 07:08
@user2240329 Check this [Documentation](https://gist.github.com/vksaini13/6051916) — TheTiger, Jul 22 '13 at 07:26

score 0 · Answer 1 · answered Jul 22 '13 at 06:31

0

+(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize;
{
    UIGraphicsBeginImageContext( newSize ); 
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

you can call this function where you want the compressed image using these lines of code.

    CGSize firstSize = CGSizeMake(210.0,210.0);
    UIImage *compImage=[mainclass imageWithImage:image scaledToSize:firstSize];

answered Jul 22 '13 at 06:31

ankit yadav

363
2
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where to call this method – user2240329 Jul 22 '13 at 06:33
below this line UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage]; – ankit yadav Jul 22 '13 at 06:34
it shows size 463 KB no any effect – user2240329 Jul 22 '13 at 06:42
you can change first size variable accordingly eg.CGSize firstSize = CGSizeMake(20.0,20.0); – ankit yadav Jul 22 '13 at 06:53
when i check the dimentions of this save image it shows 640 480 – user2240329 Jul 22 '13 at 07:07
how can it be 640 *480 when you are passing 20 *20? – ankit yadav Jul 22 '13 at 07:11
in main class i have to give the name of the class in which i write this method – user2240329 Jul 22 '13 at 07:13

score 0 · Accepted Answer · answered Jul 22 '13 at 06:35

0

what you can do is....

NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];

 CGSize sizeCropped = CGSizeMake(602, 450);//you can adjust any size here...

 pickedImage = [yourclassname imageWithImage:pickedImage scaledToSize:sizeCropped];//call below function...




+ (UIImage*)imageWithImage:(UIImage*)image
          scaledToSize:(CGSize)newSize;
{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return newImage;
 }

let me know it is working or not!!!!

Happy coding!!!!!

answered Jul 22 '13 at 06:35

NiravPatel

3,260
2
21
31

it does not compress size it shows 463KB i want it to reduce upto 100 KB – user2240329 Jul 22 '13 at 06:43
what size you have given to image , tell me... CGSize sizeCropped = CGSizeMake(602, 450);, whati s cropped size? – NiravPatel Jul 22 '13 at 06:49
same as given by you i have given same size – user2240329 Jul 22 '13 at 06:52
first tell me which size you get of your pickedimage?what is the original size??? – NiravPatel Jul 22 '13 at 06:56
no no my friend, what is the height and width of your original image?give me width and height of pickedImage. – NiravPatel Jul 22 '13 at 07:07
i get this image by capturing cam from ipad device – user2240329 Jul 22 '13 at 07:09
when i check the dimentions of this save image it shows 640 480 – – user2240329 Jul 22 '13 at 07:12
ok ,now give size 300(width) and 300(height).CGSize sizeCropped = CGSizeMake(300, 300);, then check how much space your image occupies? – NiravPatel Jul 22 '13 at 07:22
but pic gets blurry when i compress this – user2240329 Jul 22 '13 at 07:29
actually , it depends upon the original image, if original image is blurry or of less resolution then the comressed image will get blurry.Just try to compress the image who has high resolution(like 1500 * 1200) or any.then see that image gets blurry or not !! – NiravPatel Jul 22 '13 at 09:09

Paras Joshi · Answer 3 · 2013-07-22T06:53:16.833

0

if you want to save that new Image with new size then after your code add that image in library with bellow line..

UIImageWriteToSavedPhotosAlbum(UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo);

EX:

UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil);

edited Jul 22 '13 at 06:53

answered Jul 22 '13 at 06:45

Paras Joshi

20,427
11
57
70

just for your information i not post duplicate answer i have blog and i also post this type of answer before check it out – Paras Joshi Jul 22 '13 at 06:52
@TheTiger see this link http://parasjoshi3.blogspot.in/2012/05/save-image-in-library-with-only-in-one.html – Paras Joshi Jul 22 '13 at 06:53
So you mean there is no other answer about UIImage resizing ? – TheTiger Jul 22 '13 at 06:53
this is not for resize the UIImage but he want to save that new image with this new size check it out comment on Question.. Please :) – Paras Joshi Jul 22 '13 at 06:55
Ha ha ha Nice joke. Please explain what are you doing in your answer if this is not about resizing. – TheTiger Jul 22 '13 at 06:57
Wooooo You did it .... – TheTiger Jul 22 '13 at 07:05
@ParasJoshi did you check the ankityadav answer there is not much different between your answer i tried that but not working – user2240329 Jul 22 '13 at 07:15
@user2240329 - There is a difference ankit didn't write `UIImageWriteToSavedPhotosAlbum` magical line :) – TheTiger Jul 22 '13 at 07:19
@user2240329 ankit's answer scale the image and here i saved the image ... thats one line is important .. i think about that you want to save that image so i post this answer.. :) – Paras Joshi Jul 22 '13 at 07:31

how to compress the saved image in iphone application

3 Answers3