Why does UIImagePNGRepresentation(UIImage()) returns nil? I'm trying to create a UIImage() in my test code just to assert that it was correctly passed around. My comparison method for two UIImage...

I want to load images from UIImagePickerController, then save the selected photo to my app's document directory. UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; NSData *...

I want to save an image in database. Therefore I convert it to Data. However during these steps the width and height of the image will change. It is increased in size. // Original Image Size prin...

I'm currently making a photo editing app. When a photo is selected by the user, it is automatically converted into black and white using this code: func blackWhiteImage(image: UIImage) -> Data...

I found this module to be troublesome. I import more than 100 images from Photolibrary, save them in documents directory with a different name. As expected I had a memory issue in the unusual place...

i will like to pick an images from UIImagepicker, there are PNG and JPG format in camera roll. and i need to convert it into NSData. However i need to know if this images is UIImageJPEGRepresentat...

I'm using UIImagePNGRepresentation to save an image. The result image is of size 30+ KB and this is BIG in my case. I tried using UIImageJPEGRepresentation and it allows to compress image, so ima...

We are experiencing a strange crash where UIImagePNGRepresentation() is sometimes causing png_error calls. We have been unable to reproduce this error on any of our devices in house. Here is an ex...

I Need to convert UIImage to NSData but without using UIImagePngRepresentation or UIImageJpegRepresentation, for images from photolib i can use assetlib method as mentioned here Using ALAssetsLibra...

I created a masked image using a function form an iphone blog: UIImage *imgToSave = [self maskImage:[UIImage imageNamed:@"pic.jpg"] withMask:[UIImage imageNamed:@"sd-face-mask.png"]]; Looks good...

I'm generating a bunch of tiles for CATiledLayer. It takes about 11 seconds to generate 120 tiles at 256 x 256 with 4 levels of detail on an iPhone 4S. The image itself fits within 2048 x 2048. My...

In the app that I am developing, I am using an image that a user chooses from their photo albums. I need to upload a hi-res version of that photo to my server. I'm using imagePickerController and...

Each time I use the camera to take a photograph, then save it the image is always in landscape. This means the UIImageView in my Xib is the wrong way around. Its Portrait - which is what I want and...